NKT Photonics Koheras ADJUSTIK User manual

Koheras
ADJUSTIK
Product Guide Revision 1.2 10-2023
800-645-01
Emission ON
1560.7300 nm
29.9 mW

PRODUCT GUIDE
This guide includes the following NKT Photonics lasers:
Koheras ADJUSTIK
Low Noise Single Frequency Laser System
Koheras ADJUSTIK HP
High Power Low Noise Single Frequency Laser System
Disclaimer: This document is an early release and therefore subject to change. You can
download the latest revision of NKT Photonic manuals from:
https://www.nktphotonics.com/product-manuals-and-documentation/
CAUTION: Do not open the laser chassis. The laser is equipped with warranty
labels (see Figure 83) on the covers of the laser chassis. The warranty is void
if the system is opened.
Manufactured by:
NKT Photonics A/S
Blokken 84, Birkerød-3460 Denmark
The information in this publication is subject to change without notice.
All company and product names mentioned within are either trademarks or registered trademarks of
NKT Photonics.
Specifications are listed as metric units. Imperial units listed are conversions.
Copyright 2023 NKT Photonics A/S. All rights reserved.
W-10456

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Guide Overview
This product guide is intended to provide functional, operational and
installation information for the Koheras ADJUSTIK and ADJUSTIK HP lasers.
The guide is divided into three sections:
• Koheras ADJUSTIK (HP) Description - introduces the laser, its
functionality, interfaces and chassis variants.
• Operating the Laser – provides information and procedures on how to
connect, configure and manage the laser.
• Installing the Laser – includes the details on how to install the laser and
connect optional interfaces
Safety
WARNING: Do not operate the laser before first reading and understanding all
warnings, cautions and handling information stated within the documents:
Koheras ADJUSTIK Safety, Handling and Regulatory Information
– or –
Koheras ADJUSTIK HP Safety, Handling and Regulatory Information
NOTE: The paper copy of this document is included with your laser; however, it
can also be downloaded from:
https://www.nktphotonics.com/product-manuals-and-documentation/
WARNING: Use of controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation exposure.
Terminology This guide may refer to the Koheras ADJUSTIK and ADJUSTIK HP as “the
laser”. In many cases, ADJUSTIK is used to describe both the ADJUSTIK and
ADJUSTIK HP. In other cases where a distinction is required, this guide will
make a clear referral to the actual laser model names.
Target audience This guide is for technical personnel involved in the selection, planning and
deployment of lasers in laboratory and industrial settings. The guide assumes a
reasonable knowledge level of lasers, photonic principles and electrical
interface connectivity.

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Chapters inside This guide includes the following chapters:
• Chapter I “Laser Description” — Describes the laser including its general
operational principles, management and interfaces.
• Chapter 2 “Modulation” — Implementation information for wavelength and
amplitude modulation.
• Chapter 3 “Front Panel Operation” — Describes the front panel controls
and display including how to operate the laser using them.
• Chapter 4 “Communicating with the Laser” — Provides information and
procedures on how to setup a PC with the laser’s management software
and connect it to the laser.
• Chapter 5 “Enabling emission” — Contains procedures on how to safely
turn the laser emission on and off using the management software.
• Chapter 6 “Using CONTROL” — Includes descriptions of all NKT CONTROL
menus, settings, and panel items.
• Chapter 7 “Mechanical Installation” — Includes information and procedures
on how to correctly install the laser chassis. Procedures within this chapter
focus on providing adequate temperature regulation.
• Chapter 8 “Connecting the Laser” — This chapter provides the information
on how to physically connect the safety interlock, power, the optical
connections, and trigger output signals.
• Appendices — The guide includes multiple appendices including laser
specifications, support contact details, accessory descriptions, laser part
numbers, and miscellaneous procedures supporting the laser operation
and installation.
Added information
and safety notices
Lasers are highly dangerous devices that can cause serious injury and property
damage. This guide uses the following symbols to either highlight important
safety information or provide further information in relation to a specific topic.
NOTE: Highlights additional information related to the associated topic and/or
provides links or the name of the NKT guides describing the additional informa-
tion.
CAUTION: Alerts you to a potential hazard that could cause loss of data or dam-
age the system or equipment.
WARNING: The laser safety warning alerts you to potential serious injury that
may be caused when using the laser.

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Revision This section records the document revision details.
Date Revision Changes
2023-03 1.0 First release for new redesign of Koheras ADJUSTIK.
2023-08 1.1 Updated Table 16 on page 107: Max. current for pins 7,8 and 15 reduced
to 2 A.
2023-10 1.2 • Updated all images showing the warranty void label placement on the
top panel of the laser.
• Added new parameter “Power adjust displayed” on page 75.
• Updated Figure 42 on page 75.

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CONTENTS
Guide Overview ........................................................................................................................... 3
Safety ............................................................................................................................... 3
Terminology ..................................................................................................................... 3
Target audience ............................................................................................................... 3
Chapters inside ................................................................................................................4
Added information and safety notices .............................................................................. 4
Revision ........................................................................................................................... 5
TABLES ..................................................................................................................................... 13
FIGURES ................................................................................................................................... 15
PROCEDURES .......................................................................................................................... 17
Description........................................................................................................... 19
1 Laser Description ....................................................................................................................... 21
Terminology ................................................................................................................... 21
Features and Options........................................................................................................... 21
High power variants ....................................................................................................... 22
Theory of operation ........................................................................................................ 22
Safety ................................................................................................................................... 22
Module variants.................................................................................................................... 23
Center wavelength ......................................................................................................... 23
Output power .................................................................................................................. 23
Tuning types ...................................................................................................................24
Front and rear panels........................................................................................................... 25
Front panel ..................................................................................................................... 25
Rear panel ...................................................................................................................... 26
Optical specifications ........................................................................................................... 27
Laser features ...................................................................................................................... 27
Thermal tuning ............................................................................................................... 27
Fast wavelength modulation .......................................................................................... 27
External cavity stabilization ............................................................................................ 28
Amplitude modulation ..................................................................................................... 28
Operating mode ............................................................................................................. 29
Trigger ............................................................................................................................ 29

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High temperature shutdown ........................................................................................... 29
Power verification ........................................................................................................... 29
Optical interface ................................................................................................................... 30
Optical fibers, connectors and adapters ......................................................................... 30
Laser Control ....................................................................................................................... 31
User interface .................................................................................................................31
Chassis labels...................................................................................................................... 31
2 Modulation ................................................................................................................................. 33
Fast wavelength modulation ................................................................................................ 33
Configuring wavelength modulation ............................................................................... 33
Wavelength+/- signal ..................................................................................................... 34
Differential input .............................................................................................................35
Single-ended to differential ............................................................................................ 35
Singled-ended input ....................................................................................................... 35
Wavelength- to AGND .................................................................................................... 37
Differential output ........................................................................................................... 38
Wavelength modulation coupling ................................................................................... 38
Narrow vs. Wide modulation range ................................................................................ 38
Frequency response ...................................................................................................... 39
Amplitude modulation .......................................................................................................... 40
Amplitude+/- Signal ........................................................................................................ 40
External cavity stabilization.................................................................................................. 42
Setting up external cavity stabilization ........................................................................... 42
Operating the laser .............................................................................................. 43
3 Front Panel Operation................................................................................................................ 45
Overview .............................................................................................................................. 45
Display ................................................................................................................................. 45
General .......................................................................................................................... 45
Wavelength .................................................................................................................... 46
Power ............................................................................................................................. 46
Focus position ................................................................................................................ 46
Tuning increment ........................................................................................................... 47
Errors ............................................................................................................................. 47

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Status badge .................................................................................................................. 49
Front panel controls ............................................................................................................. 50
Key switch ...................................................................................................................... 50
Tuning dial and button .................................................................................................... 50
Power button .................................................................................................................. 50
Emission button .............................................................................................................. 50
Enabling emission from the front panel................................................................................ 51
Tuning the laser from the front panel ................................................................................... 52
4 Communicating with the Laser................................................................................................... 53
CONTROL software ............................................................................................................. 53
Installing CONTROL software ........................................................................................ 53
Connecting the laser to a CONTROL PC............................................................................. 53
Ethernet connection ....................................................................................................... 54
5 Enabling emission...................................................................................................................... 57
Safety ................................................................................................................................... 57
Preparation........................................................................................................................... 57
Back reflection ................................................................................................................58
Enabling and disabling emission.......................................................................................... 58
Enable emission (CONTROL) ........................................................................................ 58
6 Using CONTROL ....................................................................................................................... 61
CONTROL overview ............................................................................................................ 61
Relocating panels ........................................................................................................... 62
Toggling panels visible ................................................................................................... 63
Connecting to the laser .................................................................................................. 63
Device Selector .............................................................................................................. 64
Status panel ......................................................................................................................... 65
Status indicators ............................................................................................................. 65
System info ....................................................................................................................66
Measurements ............................................................................................................... 66
WL mod button and indicator ......................................................................................... 66
Amp mod button and indicator ....................................................................................... 66
Emission button .............................................................................................................. 66
CONTROL settings .............................................................................................................. 68
Wavelength modulation .................................................................................................. 68

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Amplitude modulation ..................................................................................................... 71
Ethernet .......................................................................................................................... 72
Watchdog .......................................................................................................................73
Clock .............................................................................................................................. 74
Front panel ..................................................................................................................... 74
View ............................................................................................................................... 76
CONTROL menu items........................................................................................................ 77
Key Updater tool ............................................................................................................ 77
Log Downloader ............................................................................................................. 78
Extensions Overview ...................................................................................................... 79
CONTROL – Control panel .................................................................................................. 81
Power mode ................................................................................................................... 81
Current mode ................................................................................................................. 81
Device monitor ..................................................................................................................... 82
Application log...................................................................................................................... 83
Installing the laser................................................................................................ 85
7 Mechanical Installation............................................................................................................... 87
General ................................................................................................................................ 87
Heat dissipation ................................................................................................................... 87
Rack mounting the laser ...................................................................................................... 88
Placing the laser on a table or shelf..................................................................................... 88
Operating and storage environment ............................................................................... 90
8 Connecting the Laser................................................................................................................. 91
Connecting the safety interlock............................................................................................ 91
Simplified Interlock operation ......................................................................................... 91
Interlock alarm ................................................................................................................92
Acknowledging interlock alarms ..................................................................................... 92
Connecting an interlock switch ....................................................................................... 93
Bus defeater ...................................................................................................................93
Connecting power ................................................................................................................ 94
Connecting modulation signals ............................................................................................ 94
Connecting the trigger input or output.................................................................................. 94
Input trigger .................................................................................................................... 95

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Output trigger .................................................................................................................95
Connecting the optical output............................................................................................... 96
Cleaning of fiber facets ........................................................................................................ 96
Cleaning tools ................................................................................................................ 96
A Specifications........................................................................................................................... 101
B Service and Support Information ............................................................................................. 105
Servicing the laser.............................................................................................................. 105
Opening the laser chassis ............................................................................................ 105
WARRANTY VOID IF REMOVED Label ...................................................................... 105
Support contact details....................................................................................................... 106
Support website ........................................................................................................... 106
Shipping address ......................................................................................................... 106
Disposal ............................................................................................................................. 106
Within EU territory ........................................................................................................ 106
Outside EU territories ................................................................................................... 106
C Interface Pin Assignments ....................................................................................................... 107
Modulation input/output...................................................................................................... 107
External bus ...................................................................................................................... 107
D Installing CONTROL Software ................................................................................................. 109
Installing CONTROL .......................................................................................................... 109

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TABLES
Table 1: ADJUSTIK and ADJUSTIK HP variant specifications................................................... 23
Table 2: Characteristics of operating modes .............................................................................. 29
Table 3: Example optical interface specifications ...................................................................... 30
Table 4: Module labels................................................................................................................ 32
Table 5: Wavelength modulation settings ................................................................................... 34
Table 6: Narrow vs wide band wavelength modulation............................................................... 38
Table 7: CONTROL panels and menu items .............................................................................. 61
Table 8: Device Monitor parameters........................................................................................... 82
Table 9: Power specifications ..................................................................................................... 94
Table 10: Koheras ADJUSTIK optical specifications ................................................................ 101
Table 11: Koheras ADJUSTIK HP optical specifications .......................................................... 102
Table 12: Mechanical dimensions............................................................................................. 102
Table 13: Operating and storage environment ......................................................................... 103
Table 14: Electrical ................................................................................................................... 103
Table 15: Modulation connector pin assignment ...................................................................... 107
Table 16: External bus pin assignment..................................................................................... 107

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FIGURES
Figure 1: ADJUSTIK front view ...................................................................................................21
Figure 2: ADJUSTIK front panel layout....................................................................................... 26
Figure 3: ADJUSTIK rear panel layout........................................................................................ 27
Figure 4: Top panel label locations .............................................................................................31
Figure 5: Rear panel label location .............................................................................................31
Figure 6: Differential input signal graph for wavelength modulation ........................................... 35
Figure 7: Single-ended to differential circuit example ................................................................. 35
Figure 8: Single-ended input signal with 2.5 V graph ................................................................. 36
Figure 9: Single-ended input w/2.5 V on an unused branch example circuit .............................. 36
Figure 10: Single-ended input signal with GND on an unused branch graph ............................. 37
Figure 11: Single-ended input connections with 0 V on an unused branch ................................ 37
Figure 12: Differential output signal graph .................................................................................. 38
Figure 13: X15 variant wavelength modulation response graph................................................. 39
Figure 14: E15/Y10 variant wavelength modulation response graph ......................................... 40
Figure 15: Differential input for amplitude modulation graph ...................................................... 41
Figure 16: Single-ended input for amplitude modulation graph .................................................. 41
Figure 17: Koheras ADJUSTIK in a Pound-Drever-Hall configuration........................................ 42
Figure 18: Front panel display and controls................................................................................ 45
Figure 19: OLED display layout ..................................................................................................46
Figure 20: Wavelength tuning increment and setpoint................................................................ 47
Figure 21: Power tuning.............................................................................................................. 47
Figure 22: Example of an error message.................................................................................... 49
Figure 23: Operational state badge ............................................................................................ 49
Figure 24: GUI panel navigation .................................................................................................61
Figure 25: Panel dragged to a new location in the main window................................................ 62
Figure 26: Panels dragged outside the main window ................................................................. 62
Figure 27: Toggling panel visibility.............................................................................................. 63
Figure 28: Welcome screen and connecting............................................................................... 63
Figure 29: Connect button .......................................................................................................... 64
Figure 30: Device selector panel ................................................................................................64
Figure 31: Status panel............................................................................................................... 65
Figure 32: GUI settings ............................................................................................................... 68
Figure 33: Wavelength modulation - internal source .................................................................. 69
Figure 34: Wavelength modulation - external source ................................................................. 69

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Figure 35: Internal generator waveform selection – Type........................................................... 70
Figure 36: Turning on wavelength modulation............................................................................ 71
Figure 37: Amplitude modulation source settings ....................................................................... 72
Figure 38: Internal generator amplitude modulation settings...................................................... 72
Figure 39: Ethernet setting.......................................................................................................... 73
Figure 40: Watchdog setting....................................................................................................... 74
Figure 41: Clock setting .............................................................................................................. 74
Figure 42: Front panel setting..................................................................................................... 75
Figure 43: View setting ............................................................................................................... 76
Figure 44: Menu items ................................................................................................................ 77
Figure 45: Extensions Overview ................................................................................................. 80
Figure 46: Operating mode set to power .................................................................................... 81
Figure 47: Serial Monitor............................................................................................................. 83
Figure 48: Rear panel heat sink.................................................................................................. 87
Figure 49: ADJUSTIK - rack mounted ........................................................................................ 88
Figure 50: Rubber mounting feet ................................................................................................ 89
Figure 51: Table or shelf placement ........................................................................................... 89
Figure 52: Interlock connected to a door switch - Laser ON....................................................... 92
Figure 53: Interlock connected to a door switch - Laser SHUTDOWN ....................................... 92
Figure 54: Bus defeater .............................................................................................................. 93
Figure 55: Trigger input circuit .................................................................................................... 95
Figure 56: Trigger output circuit.................................................................................................. 95
Figure 57: Lint-free wipe example...............................................................................................97
Figure 58: Example of a fiber cleaning cartridge ........................................................................ 97
Figure 59: Mechanical dimensions ........................................................................................... 103
Figure 60: Warranty seal........................................................................................................... 105
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PROCEDURES
Procedure 1: Enabling emission ................................................................................................ 51
Procedure 2: Wavelength tuning................................................................................................ 52
Procedure 3: Power level tuning ................................................................................................ 52
Procedure 4: Connecting a PC to the laser using a USB cable................................................. 53
Procedure 5: Connecting a PC to the laser using Ethernet ....................................................... 55
Procedure 6: Turning on the laser using CONTROL ................................................................. 58
Procedure 7: Relocating panels................................................................................................. 62
Procedure 8: Using the Key Updater tool .................................................................................. 77
Procedure 9: Using the Log Downloader ................................................................................... 78
Procedure 10: Connecting the door interlock circuit .................................................................. 93
Procedure 11: Installing CONTROL.......................................................................................... 109

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Section 1 Description
This section provides a description of the following topics:
•“Laser Description” on page 21
•“Module variants” on page 23
•“Front and rear panels” on page 25
•“Laser features” on page 27
•“Optical interface” on page 30
•“Laser Control” on page 31
•“Chassis labels” on page 31
The section also includes a chapter on modulating the optical output:
•“Modulation” on page 33

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