NKT Photonics Koheras BASIK User manual

Item: 800-601-01
Customer Revision: 1.5
NKTP Revision: 2.0
Release Date: 03-2022
Koheras BASIK
PRODUCT GUIDE
Low Noise Single Frequency Laser Module

PRODUCT GUIDE
This guide includes the following NKT Photonics Lasers:
Koheras BASIK
Low Noise Single Frequency Laser Module
W-10456

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GUIDE OVERVIEW
This product guide is intended to provide functional, operational and installation
information for the Koheras BASIK laser modules. The guide is divided into three
sections:
• Koheras BASIK 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.
Warning: Do not operate the laser before first reading and understanding all
warnings, cautions and handling information stated within the document:
Koheras BASIK 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 BASIK modules as “the laser” or as “the
module”. In specific cases where a distinction is required, this guide will use 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” — Information on implementation of the laser’s
wavelength modulation feature.
• 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
enable and disable laser emission using the management software.

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• Chapter 5 “Using CONTROL” — Includes descriptions of all NKT CONTROL
menu, settings, and panel items.
• Chapter 6 “Software Development Kit” — Includes descriptions and
procedures for some of the key settings that can be configured and
monitored using the SDK’s Generic User Interface.
• 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 information on
how to physically connect the safety interlock, power, the optical
connections, and the BASIK interface board.
• Appendices — The guide includes multiple appendices including laser
specifications, support contact details, accessory descriptions, a
configuration ID cross-reference and miscellaneous procedures and
information 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 use 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 pro-
vides links or the name of the NKT guides describing the additional information.
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 This section records the document revision details.
Date Revision Changes
2019-10 1.0 First release - documents rewritten and overhauled from earlier releases.
2020-01 1.1 Added appendix F - Configuration IDs: configuration ID description and
cross-reference for standard configuration IDs.
2020-06 1.2 Removed requirement to install a heat sink when operating under normal
conditions.
Replaced the warranty void label shown in appendix B.

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2021-01 1.3 Updated support contact information in appendix B.
2022-02 1.4 Updates include minor grammar corrections and
improvements in language clarity. Some figures have
also been modified for clarity.
•Updated Table 20 on page 113.
•Updated Procedure 9 on page 115 to Windows 10.
•Added scales drop down selection description in Procedure 3 on
page 56.
•Added power scale drop down selection of wavelength or offset to
section “Power mode” on page 76.
•Updated description in section “Main adapter” on page 121.
•Added interlock jumper to Figure 74 on page 122.
2022-03 1.5 Updated with the following:
•Removed the misapplied serial monitor description and replaced it
“Device Monitor” on page 77.
•Updated Table 11 on page 79.
•Updated “Setting the operating mode” on page 80.
•Updated “Auto start” on page 80.
•Updated “Narrow and wide range setting” on page 81.
•Updated “Setting the wavelength modulation source” on page 82.
•Updated “Setting the wavelength modulation signal coupling” on
page 83.
•Updated “Internal generator -signal output” on page 85.
Date Revision Changes

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CONTENTS
Guide Overview ............................................................................................... 3
Terminology ......................................................................................... 3
TABLES ........................................................................................................ 13
FIGURES ...................................................................................................... 15
PROCEDURES ............................................................................................ 19
Section 1 KOHERAS BASIK DESCRIPTION 21
1 Laser Description .......................................................................................... 23
Features and options ......................................................................... 23
Theory of operation ............................................................................ 24
Module variants ......................................................................................24
Configuration ID ................................................................................. 24
Center wavelength ............................................................................. 24
Output power ..................................................................................... 25
Tuning types ...................................................................................... 25
Front and rear panels .............................................................................25
Front panel ......................................................................................... 25
Rear panel ......................................................................................... 26
Optical specifications ..............................................................................27
Laser features .........................................................................................27
Thermal tuning ................................................................................... 27
Fast wavelength modulation .............................................................. 28
External cavity stabilization ................................................................ 29
Operating mode ................................................................................. 29
Trigger ................................................................................................ 29
Auto-start ........................................................................................... 29
Emission delay ................................................................................... 30
Shutdown delay ................................................................................. 30

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High temperature shutdown ............................................................... 30
Power verification .............................................................................. 30
Miscellaneous .........................................................................................31
Power supply ..................................................................................... 31
Safety ................................................................................................. 31
Accessories ....................................................................................... 31
Optical interface...................................................................................... 32
Optical fibers, connectors and adapters ............................................ 32
Laser control ...........................................................................................33
User interface .................................................................................... 33
Status LEDs ............................................................................................33
Module labels .........................................................................................34
2 Modulation .................................................................................................... 37
Fast wavelength modulation ...................................................................37
Configuring external and internal wavelength modulation ................. 37
Wavelength+/- signal ......................................................................... 38
Differential input ................................................................................. 39
Single-ended to differential ................................................................ 39
Singled-ended input ........................................................................... 39
Wavelength- to GND .......................................................................... 41
Differential output ............................................................................... 42
Wavelength modulation coupling ....................................................... 42
Narrow versus wide modulation range .............................................. 42
Frequency response .......................................................................... 42
External cavity stabilization (BASIK X15) ...............................................44
Setting up external cavity stabilization ............................................... 45
Section 2 OPERATING THE LASER 47
3 Communicating with the Laser ...................................................................... 49
Connection kit .........................................................................................49
CONTROL software ...............................................................................49

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Installing the software ........................................................................ 49
Software Development Kit ...................................................................... 50
Generic User Interface ....................................................................... 50
Connecting CONTROL to the laser ........................................................50
Connecting the SDK GUI to the laser..................................................... 53
4 Turning ON the Laser .................................................................................... 55
Safety .....................................................................................................55
Preparation .............................................................................................55
Controlling the laser emissions............................................................... 56
Turning On the laser .......................................................................... 56
5 Using CONTROL .......................................................................................... 59
CONTROL overview ...............................................................................59
Relocating panels .............................................................................. 60
Toggling panels visible ....................................................................... 61
Connecting to the laser ...................................................................... 61
........................................................................................................... 62
Device selector .................................................................................. 62
Status panel............................................................................................ 63
Status indicators ................................................................................ 63
Module info ........................................................................................ 64
Measurements ................................................................................... 64
WL mod button and indicator ............................................................. 64
Emission button ................................................................................. 64
CONTROL settings................................................................................. 65
Wavelength modulation ..................................................................... 65
Trigger ................................................................................................ 69
Power/Current mode .......................................................................... 70
Auto-start ........................................................................................... 71
View ................................................................................................... 71
CONTROL menu items .......................................................................... 72
Key Updater tool ................................................................................ 72

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Log Downloader ................................................................................. 73
Extensions Overview ......................................................................... 74
CONTROL – Control panel .....................................................................75
Wavelength ........................................................................................ 75
Power mode ....................................................................................... 76
Current mode ..................................................................................... 76
Device Monitor........................................................................................ 77
Application log ........................................................................................78
6 Software Development Kit ............................................................................ 79
Read/write registers................................................................................ 80
Tuning the wavelength ....................................................................... 80
Setting the operating mode ................................................................ 80
Auto start ........................................................................................... 80
Setting the emission delay ................................................................. 81
Narrow and wide range setting .......................................................... 81
Setting the wavelength modulation source ....................................... 82
Setting the wavelength modulation signal coupling ........................... 83
Internal generator frequency .............................................................. 84
Internal generator amplitude .............................................................. 84
Internal generator signal waveform ................................................... 84
Internal generator -signal output ........................................................ 85
Wavelength modulation on/off ........................................................... 86
Trigger setting input/output ................................................................ 86
Trigger indicates emission ................................................................. 87
Trigger sawtooth wavelength modulation .......................................... 87
Readings ................................................................................................ 88
Errors and status indicators.................................................................... 89
Status indicators ................................................................................ 89
Error codes ........................................................................................ 89
Graphing ................................................................................................. 89

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Section 3 INSTALLING THE LASER 91
7 Mechanical Installation .................................................................................. 93
General ................................................................................................... 93
Standalone mounting ..............................................................................93
Heat dissipation ................................................................................. 93
Slide-in mounting.................................................................................... 95
Operating and storage environment .................................................. 96
8 Connecting the Laser .................................................................................... 97
Connecting the safety interlock .............................................................. 97
Interlock operation ............................................................................. 97
Lemo connector ................................................................................. 97
Connecting an interlock switch .......................................................... 98
Connecting power................................................................................... 99
Connecting modulation signals ...............................................................99
BASIK interface board ....................................................................... 99
Connecting the trigger input or output ..................................................102
Input trigger ...................................................................................... 102
Output trigger ................................................................................... 103
Connecting the optical output ...............................................................103
Appendices
A Specifications .............................................................................................. 107
B Service and support Information ................................................................. 111
Servicing the laser ................................................................................111
Opening the laser chassis ................................................................ 111
WARRANTY VOID IF REMOVED Label ......................................... 111
Support contact details ......................................................................... 112
Support website ............................................................................... 112
Shipping address ............................................................................. 112
C Interface Pin Assignments .......................................................................... 113

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Main electrical interface ........................................................................113
D CONTROL Software ................................................................................... 115
Installing CONTROL .............................................................................115
E RS-485 adapter ........................................................................................... 121
Main adapter .................................................................................... 121
F Configuration ID ......................................................................................... 123
Module Configuration ID .................................................................. 123

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TABLES
Table 1: BASIK variant specifications............................................................... 24
Table 2: Recommended power modes............................................................. 29
Table 3: Optical Interface Specifications ......................................................... 33
Table 4: Status LEDs........................................................................................ 34
Table 5: Module labels ..................................................................................... 35
Table 6: Wavelength modulation settings......................................................... 38
Table 7: Narrow vs wide band wavelength modulation .................................... 42
Table 8: Koheras BASIK PC connection kit...................................................... 49
Table 9: CONTROL panels and menu items.................................................... 59
Table 10: Device Monitor parameters .............................................................. 77
Table 11: Generic user interface registers ....................................................... 79
Table 12: Power adapter specifications............................................................ 99
Table 13: Wavelength modulation pin descriptions ........................................ 101
Table 14: Extra I/O pin descriptions ............................................................... 101
Table 15: Optical ........................................................................................... 107
Table 16: Mechanical dimensions ................................................................. 107
Table 17: Operating and storage environment .............................................. 107
Table 18: Electrical......................................................................................... 108
Table 19: Safety and regulatory compliances ............................................... 108
Table 20: Main electrical interface pin assignment......................................... 113
Table 21: RS-485 adapter status LEDs.......................................................... 122
Table 22: Standard BASIK configuration IDs ................................................. 123

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FIGURES
Figure 1: BASIK front panel ............................................................................. 23
Figure 2: BASIK front panel layout .................................................................. 26
Figure 3: BASIK rear panel layout ................................................................... 27
Figure 4: Frequency response using wavelength modulation ......................... 28
Figure 5: USB-RS485 Adapter ........................................................................ 31
Figure 6: BASIK equipped with fiber cord and FC/APC connector .................. 32
Figure 7: Status LEDs ..................................................................................... 33
Figure 8: Top panel label locations .................................................................. 34
Figure 9: Front panel label locations ............................................................... 35
Figure 10: Differential input signal for wavelength modulation ........................ 39
Figure 11: Single-ended to differential ............................................................. 39
Figure 12: Single-ended input signal with 2.5 V .............................................. 40
Figure 13: Single-ended input with 2.5 V on an unused branch ...................... 40
Figure 14: Single-ended input signal with GND on an unused branch ............ 41
Figure 15: Single-ended input connections with 0 V on an unused branch ..... 41
Figure 16: Differential output signal ................................................................. 42
Figure 17: BASIK X15 wavelength modulation response ................................ 43
Figure 18: BASIK E15/C15/Y10 wavelength modulation response ................. 44
Figure 19: BASIK X15 in Pound-Drever-Hall configuration ............................. 44
Figure 20: GUI panel navigation ...................................................................... 59
Figure 21: Relocating panels within CONTROL ............................................. 60
Figure 22: Dragging panels outside the main window ..................................... 60
Figure 23: Toggling panel visibility .................................................................. 61
Figure 24: Welcome screen and connecting ................................................... 61
Figure 25: Connect button ............................................................................... 62
Figure 26: Device selector panel ..................................................................... 62
Figure 27: Status panel ................................................................................... 63
Figure 28: GUI settings .................................................................................... 65

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Figure 29: Wavelength modulation - internal source ....................................... 66
Figure 30: Wavelength modulation - external source ...................................... 66
Figure 31: Wavelength modulation - both ........................................................ 67
Figure 32: Internal generator waveform selection – Type setting .................... 67
Figure 33: Turning on wavelength modulation ................................................ 69
Figure 34: Trigger type – Input ........................................................................ 70
Figure 35: Trigger type – Output ..................................................................... 70
Figure 36: Power and current mode controls .................................................. 71
Figure 37: Auto-start setting ............................................................................ 71
Figure 38: View setting .................................................................................... 71
Figure 39: Menu items ..................................................................................... 72
Figure 40: Extensions Overview ...................................................................... 75
Figure 41: Wavelength controls ....................................................................... 76
Figure 42: Operating mode set to power ......................................................... 76
Figure 43: Serial Monitor ................................................................................. 78
Figure 44: Setting the wavelength offset ......................................................... 80
Figure 45: Setting the operating mode ............................................................ 80
Figure 46: Setting the Auto-start function ........................................................ 81
Figure 47: Setting the emission delay ............................................................. 81
Figure 48: Setting the modulation range parameter ........................................ 82
Figure 49: Setting the wavelength modulation signal source .......................... 82
Figure 50: Setting the coupling type ................................................................ 83
Figure 51: Setting the internal generator frequency ........................................ 84
Figure 52: Setting the signal amplitude of the internal generator .................... 84
Figure 53: Setting the internal generator waveform ........................................ 85
Figure 54: Toggling the internal generator signal output ................................. 85
Figure 55: Turning ON wavelength modulation ............................................... 86
Figure 56: Setting the trigger to input or output ............................................... 86
Figure 57: Trigger set to indicate emission ...................................................... 87
Figure 58: Trigger set to sawtooth wavelength modulation ............................. 87
Figure 59: Read-only registers under the Readings tab .................................. 88

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Figure 60: Error and status tab ........................................................................ 89
Figure 61: Graphing tab ................................................................................... 90
Figure 62: Heat transfer surface - BASIK rear panel ....................................... 93
Figure 63: Heat transfer surface - BASIK rear panel ....................................... 94
Figure 64: Mounting the laser .......................................................................... 95
Figure 65: Front panel mounting holes and handle ......................................... 96
Figure 66: Safety interlock connected to a door switch (open position) .......... 98
Figure 67: Power supply .................................................................................. 99
Figure 68: BASIK interface board .................................................................. 100
Figure 69: Trigger input circuit ....................................................................... 102
Figure 70: Trigger output circuit ..................................................................... 103
Figure 71: Mechanical dimensions ................................................................ 109
Figure 72: Warranty seal ............................................................................... 111
Figure 73: Main electrical interface PIN layoutl ............................................. 113
Figure 74: RS-485 adapter ............................................................................ 122
Figure 75: How to read the configuration ID .................................................. 123
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PROCEDURES
Procedure 1: Connecting CONTROL to the laser ........................................... 51
Procedure 2: Connecting the SDK Generic User Interface to the laser .......... 53
Procedure 3: Turning on the laser using CONTROL....................................... 56
Procedure 4: Turning on the laser using the Generic User Interface .............. 58
Procedure 5: Relocating panels ...................................................................... 60
Procedure 6: Using the Key Updater tool........................................................ 72
Procedure 7: Using the Log Downloader......................................................... 73
Procedure 8: Connecting the door interlock circuit (with the RS-485 adapter) 98
Procedure 9: Installing CONTROL ................................................................. 115

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