NKT Photonics Koheras ADJUSTIK HP User manual

Item 800-611-01
Koheras ADJUSTIK (HP)
PRODUCT GUIDE
Low Noise Single Frequency Laser System

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
Koheras ADJUSTIK Product Guide Release 1.0 04-2021 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/lasers-fibers/support/product-manuals/
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.
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.

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• Chapter 3 “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 4 “Turning ON the Laser” — Contains procedures on how to safely
turn the laser emissions on and off using the management software.
• Chapter 5 “Using CONTROL” — Includes descriptions of all NKT CONTROL
menu, settings, and panel items.
• Chapter 6 “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 7 “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 damage
the system or equipment.
Warning: The laser safety warning alerts you to potential serious injury that may
be caused when using the laser.
Revision The section records the document revision details.
September 2020 – First release - the document has been rewritten and
overhauled from earlier releases.
March 2021 – Release 1.1 added the Koheras ADJUSTIK HP
April 2021 – Release 1.0 revision rolled back to 1.0 due to internal system
requirements.

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CONTENTS
Guide Overview ................................................................................................................... 3
Safety ........................................................................................................................ 3
Terminology ............................................................................................................ 3
TABLES .....................................................................................................................11
FIGURES ..................................................................................................................13
PROCEDURES ........................................................................................................17
Section 1 KOHERAS ADJUSTIK (HP) DESCRIPTION 19
1 Laser Description ...............................................................................................................21
Chassis and front panel style ........................................................................... 21
Terminology .......................................................................................................... 21
Features and Options ........................................................................................ 22
High power variants ........................................................................................... 22
Theory of operation ............................................................................................23
Safety ........................................................................................................................... 23
Module variants ........................................................................................................ 24
Part numbers ....................................................................................................... 24
Center wavelength ............................................................................................. 24
Output power ....................................................................................................... 24
Tuning types ........................................................................................................ 25
Front and rear panels.............................................................................................. 26
Front panel ........................................................................................................... 26
Rear panel .............................................................................................................27
Optical specifications .............................................................................................. 28
Laser features ........................................................................................................... 28
Thermal tuning .................................................................................................... 28
Fast wavelength modulation ........................................................................... 28
External cavity stabilization .............................................................................. 29

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Amplitude modulation ....................................................................................... 29
Operating mode .................................................................................................. 29
Trigger ................................................................................................................... 30
High temperature shutdown ............................................................................ 30
Power verification ............................................................................................... 30
Optical interface......................................................................................................... 31
Optical fibers, connectors and adapters ....................................................... 31
Laser Control ............................................................................................................. 32
User interface ...................................................................................................... 32
Status LEDs ................................................................................................................ 33
Chassis labels............................................................................................................ 34
2 Modulation ..........................................................................................................................37
Fast wavelength modulation ................................................................................. 37
Configuring wavelength modulation ..............................................................37
Wavelength+/- signal ......................................................................................... 38
Differential input .................................................................................................. 39
Single-ended to differential ............................................................................. 39
Singled-ended input .......................................................................................... 39
Wavelength- to AGND ........................................................................................ 41
Differential output ............................................................................................... 42
Wavelength modulation coupling .................................................................. 42
Narrow vs. Wide modulation range ............................................................... 42
Frequency response .......................................................................................... 43
Amplitude modulation ............................................................................................. 44
Amplitude+/- Signal ............................................................................................ 44
External cavity stabilization.................................................................................... 46
Setting up external cavity stabilization ......................................................... 46
Section 2 OPERATING THE LASER 47
3 Front Panel Menu ............................................................................................................. 49
Overview ..................................................................................................................... 49

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General operation .............................................................................................. 49
Menu items ................................................................................................................ 50
Top menu .............................................................................................................. 50
Wavelength ........................................................................................................... 51
Wavelength display ............................................................................................. 51
W1 modulation ...................................................................................................... 51
W1 mod. Gain ....................................................................................................... 52
W1 mod. source ................................................................................................... 52
W1 mod. Coupling ............................................................................................... 52
W1 mod. Range .................................................................................................... 53
Power /current mode ......................................................................................... 53
Power ..................................................................................................................... 53
Power unit ............................................................................................................. 54
Watchdog timer ................................................................................................... 54
Display backlight ................................................................................................. 54
IP Address ............................................................................................................ 55
Emission button ................................................................................................... 55
4 Communicating with the Laser ......................................................................................57
CONTROL software ..................................................................................................57
Installing CONTROL software ..........................................................................57
Connecting the laser to a CONTROL PC ............................................................57
Ethernet connection .......................................................................................... 58
5 Turning ON the Laser ........................................................................................................61
Safety ............................................................................................................................ 61
Preparation ................................................................................................................. 61
Back reflection ..................................................................................................... 62
Enabling and disabling emission .......................................................................... 62
Enable emission (CONTROL) ........................................................................... 62
Enable emission (front panel) .......................................................................... 64
6 Using CONTROL .............................................................................................................. 69
CONTROL overview ................................................................................................ 69

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Relocating panels ............................................................................................... 70
Toggling panels .....................................................................................................71
Connecting to the laser .......................................................................................71
Device Selector .....................................................................................................71
Status panel ............................................................................................................... 72
Status indicators .................................................................................................. 72
System info ............................................................................................................73
Measurements ......................................................................................................73
WL mod button and indicator ...........................................................................73
Amp mod button and indicator ........................................................................73
Emission button ....................................................................................................73
CONTROL settings................................................................................................... 74
Wavelength modulation .....................................................................................74
Amplitude modulation ........................................................................................77
Ethernet ..................................................................................................................78
Watchdog .............................................................................................................. 79
Clock ...................................................................................................................... 80
View ......................................................................................................................... 81
CONTROL menu items ............................................................................................. 81
Serial monitor............................................................................................................. 82
Application log .......................................................................................................... 82
CONTROL – Control panel .................................................................................... 83
Power mode ......................................................................................................... 83
Current mode ....................................................................................................... 83
Section 3 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

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Operating and storage environment ............................................................. 89
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 ...................................................................... 92
Bus defeater ......................................................................................................... 93
Connecting power ................................................................................................... 93
Connecting modulation signals ............................................................................ 94
Connecting the trigger input or output ............................................................... 94
Input trigger .......................................................................................................... 94
Output trigger ...................................................................................................... 94
Connecting the optical output .............................................................................. 95
Cleaning of fiber facets ........................................................................................... 96
Cleaning tools ...................................................................................................... 96
Appendices
A Specifications .................................................................................................................... 99
B Service and support Information ................................................................................. 103
Servicing the laser ..................................................................................................103
Opening the laser chassis ...............................................................................103
WARRANTY VOID IF REMOVED Label ........................................................103
Support contact details.......................................................................................... 104
Support website .................................................................................................104
Shipping address ...............................................................................................104
C Interface Pin Assignments ............................................................................................105
Modulation input/output ........................................................................................105
External bus .............................................................................................................105
D CONTROL Software ....................................................................................................... 107
Installing CONTROL ................................................................................................107

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E Part numbers ....................................................................................................................113

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TABLES
Table 1: ADJUSTIK and ADJUSTIK HP variant specifications................................... 24
Table 2: Characteristics of power modes ...................................................................... 30
Table 3: Example optical interface specifications ....................................................... 31
Table 4: Status LEDs............................................................................................................ 33
Table 5: Module labels........................................................................................................ 35
Table 6: Wavelength modulation settings ..................................................................... 38
Table 7: Narrow vs wide band wavelength modulation............................................. 42
Table 8: Front panel menu items ..................................................................................... 49
Table 9: CONTROL panels and menu items ................................................................. 69
Table 10: Power specifications.......................................................................................... 93
Table 11: Koheras ADJUSTIK optical specifications..................................................... 99
Table 12: Koheras ADJUSTIK HP optical specifications ...........................................100
Table 13: Mechanical dimensions ..................................................................................100
Table 14: Operating and storage environment ...........................................................100
Table 15: Electrical...............................................................................................................100
Table 16: Safety and regulatory compliances ..............................................................101
Table 17: Mechanical dimensions.....................................................................................101
Table 18: Modulation connector pin assignment ........................................................105
Table 19: External bus pin assignment ..........................................................................105
Table 20: ADJUSTIK and ADJUSTIK HP part numbers..............................................113

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FIGURES
Figure 1: ADJUSTIK front panel ........................................................................................ 21
Figure 2: ADJUSTIK HP front panel ................................................................................. 21
Figure 3: ADJUSTIK HP front panel layout ....................................................................27
Figure 4: ADJUSTIK rear panel layout ........................................................................... 28
Figure 5: Top panel label locations ................................................................................ 34
Figure 6: Rear panel label location ................................................................................. 34
Figure 7: Differential input signal for wavelength modulation ................................. 39
Figure 8: Single-ended to differential ............................................................................ 39
Figure 9: Single-ended input signal with 2.5 V ........................................................... 40
Figure 10: Single-ended input with 2.5 V on an unused branch ............................ 40
Figure 11: Single-ended input signal with GND on an unused branch ................... 41
Figure 12: Single-ended input connections with 0 V on an unused branch ......... 41
Figure 13: Differential output signal ................................................................................ 42
Figure 14: X15 variant wavelength modulation response ......................................... 43
Figure 15: E15/C15/Y10 variant wavelength modulation response ......................... 44
Figure 16: Differential input for amplitude modulation .............................................. 45
Figure 17: Single-ended input for amplitude modulation .......................................... 45
Figure 18: The laser used in a Pound-Drever-Hall configuration ............................ 46
Figure 19: Top level menu ................................................................................................. 50
Figure 20: Wavelength setting menu .............................................................................. 51
Figure 21: Wavelength display menu - set as Absolute ............................................. 51
Figure 22: Wavelength modulation - ON ....................................................................... 51
Figure 23: Wavelength modulation gain setting menu ............................................. 52
Figure 24: Wavelength modulation source signal set to internal ........................... 52
Figure 25: Wavelength modulation signal coupling set to AC ................................ 52
Figure 26: Wavelength modulation range set to Narrow ......................................... 53
Figure 27: Operation mode set to constant power mode ........................................ 53
Figure 28: Power tuning menu ........................................................................................ 53
Figure 29: Power unit menu - set to mW ...................................................................... 54

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Figure 30: Watchdog timer setting ................................................................................. 54
Figure 31: Setting the intensity level of the LCD panel back light .......................... 54
Figure 32: IP address setting ............................................................................................ 55
Figure 33: GUI panel navigation ......................................................................................69
Figure 34: Panel dragged to a new location in the main window - ....................... 70
Figure 35: Panels dragged outside the main window ............................................... 70
Figure 36: Panels dragged outside the main window ................................................ 71
Figure 37: Welcome screen and connecting ................................................................ 71
Figure 38: Device selector panel ..................................................................................... 71
Figure 39: Status panel ...................................................................................................... 72
Figure 40: GUI settings ...................................................................................................... 74
Figure 41: Wavelength modulation - internal source .................................................. 75
Figure 42: Wavelength modulation - external source ............................................... 75
Figure 43: Internal generator waveform selection (Type) ......................................... 75
Figure 44: Turning on wavelength modulation ............................................................77
Figure 45: Power and current mode controls ...............................................................77
Figure 46: Internal amplitude modulation settings ..................................................... 78
Figure 47: Ethernet setting ................................................................................................ 79
Figure 48: Watchdog setting ............................................................................................80
Figure 49: Clock setting .....................................................................................................80
Figure 50: View setting ....................................................................................................... 81
Figure 51: Menu items ......................................................................................................... 81
Figure 52: Serial monitor ...................................................................................................82
Figure 53: Serial Monitor ................................................................................................... 82
Figure 54: Operating mode set to power ..................................................................... 83
Figure 55: Rear panel heat sink ....................................................................................... 87
Figure 56: Image of the laser rack mounted ................................................................ 88
Figure 57: Rubber mounting feet ....................................................................................89
Figure 58: Table or shelf mounting ................................................................................89
Figure 59: Interlock connected to a door switch - Laser ON ....................................91
Figure 60: Interlock connected to a door switch - Laser SHUTDOWN ................92
Figure 61: Trigger input circuit .......................................................................................... 94
Figure 62: Trigger output circuit ......................................................................................95

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Figure 63: Lint-free wipe example .................................................................................. 96
Figure 64: Example of a fiber cleaning cartridge ........................................................ 96
Figure 65: Warranty seal ..................................................................................................103
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PROCEDURES
Procedure 1: Connecting a PC to the laser using a USB cable ............................... 57
Procedure 2: Connecting a PC to the laser using Ethernet ..................................... 59
Procedure 3: Turning on the laser using CONTROL.................................................. 63
Procedure 4: Turning on the laser using the front panel controls ......................... 65
Procedure 5: Relocating panels ...................................................................................... 70
Procedure 6: Connecting the door interlock circuit................................................... 93
Procedure 7: Installing CONTROL...................................................................................107

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SECTION 1
KOHERAS ADJUSTIK (HP) DESCRIPTION
This section provides a description of the following topics:
•“Laser Description” on page 21
•“Module variants” on page 24
•“Laser features” on page 28
•“Miscellaneous” on page 30
•“Optical interface” on page 31
•“Laser Control” on page 32
•“Status LEDs” on page 33
•“Chassis labels” on page 34
The section also includes a chapter on modulating the optical output:
•“Modulation” on page 37

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