NKT Koheras BASIK User manual

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
Koheras BASIK Product Description Revision 1.1 01-2020 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”. In specific
cases where a distinction is required, this guide will use the actual laser model
names or simply refer to the laser as the “module”.
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
turn the laser emissions on and off 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 using the
SDK.
• 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 the BASIK interface board accessory.
• 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
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.
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.

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CONTENTS
Guide Overview ................................................................................................................... 3
Terminology ............................................................................................................ 3
TABLES .....................................................................................................................11
FIGURES ..................................................................................................................13
PROCEDURES ........................................................................................................17
Section 1 KOHERAS BASIK DESCRIPTION 19
1 Laser Description ...............................................................................................................21
Features and Options ......................................................................................... 21
Theory of operation ........................................................................................... 22
Module variants ........................................................................................................ 22
Configuration ID .................................................................................................. 22
Center wavelength ............................................................................................. 22
Output power ........................................................................................................23
Tuning types .........................................................................................................23
Front and rear panels .............................................................................................. 23
Front panel ............................................................................................................23
Rear panel ............................................................................................................ 24
Optical specifications .............................................................................................. 25
Laser features ........................................................................................................... 25
Thermal tuning .................................................................................................... 25
Fast wavelength modulation ........................................................................... 26
External cavity stabilization ...............................................................................27
Operating mode ...................................................................................................27
Trigger ....................................................................................................................27
Auto-start ...............................................................................................................27
Emission delay ..................................................................................................... 28
Shutdown delay .................................................................................................. 28

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High temperature shutdown ............................................................................ 28
Power verification ............................................................................................... 28
Miscellaneous ............................................................................................................ 29
Power supply ....................................................................................................... 29
Safety ..................................................................................................................... 29
Accessories .......................................................................................................... 29
Optical interface ........................................................................................................ 30
Optical fibers, connectors and adapters ...................................................... 30
Laser Control .............................................................................................................. 31
User interface ....................................................................................................... 31
Status LEDs ................................................................................................................. 31
Module labels ............................................................................................................ 32
2 Modulation ......................................................................................................................... 35
Fast wavelength modulation ................................................................................. 35
Configuring external and internal wavelength modulation ..................... 35
Wavelength+/- signal ......................................................................................... 36
Differential input ...................................................................................................37
Single-ended to differential ..............................................................................37
Singled-ended input ...........................................................................................37
Wavelength- to GND .......................................................................................... 39
Differential output ............................................................................................... 40
Wavelength modulation coupling .................................................................. 40
Narrow vs. Wide modulation range ............................................................... 40
Frequency response .......................................................................................... 40
External cavity stabilization (BASIK X15) ............................................................. 42
Setting up external cavity stabilization ......................................................... 43
Section 2 OPERATING THE LASER 45
3 Communicating with the Laser ......................................................................................47
Connection Kit ........................................................................................................... 47
CONTROL software ................................................................................................. 47

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Installing the software ........................................................................................47
Software Development Kit ..................................................................................... 48
Generic User Interface .......................................................................................48
Connecting the laser to a PC with CONTROL .................................................. 48
Connecting the laser to a PC using the Generic User Interface ................... 51
4 Turning ON the Laser .......................................................................................................53
Safety ........................................................................................................................... 53
Preparation ................................................................................................................ 53
Controlling the laser emissions ............................................................................ 54
Turning On the laser .......................................................................................... 54
5 Using CONTROL ...............................................................................................................57
CONTROL overview .................................................................................................57
Relocating panels ............................................................................................... 58
Toggling panels .................................................................................................. 59
Connecting to the laser .................................................................................... 59
Status panel ............................................................................................................... 59
Status indicators ................................................................................................. 60
Module info ........................................................................................................... 61
Measurements ...................................................................................................... 61
WL mod button and indicator ........................................................................... 61
Emission button .................................................................................................... 61
CONTROL settings .................................................................................................... 61
Wavelength modulation .................................................................................... 62
Trigger ................................................................................................................... 66
Power/Current mode ..........................................................................................67
Auto-start .............................................................................................................. 68
View ....................................................................................................................... 68
CONTROL menu items ........................................................................................... 69
Serial monitor ....................................................................................................... 69
Application log .................................................................................................... 69

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CONTROL – Control panel ..................................................................................... 71
Wavelength ............................................................................................................71
Power mode ...........................................................................................................71
Current mode ....................................................................................................... 72
6 Software Development Kit ..............................................................................................73
Read/write registers ................................................................................................. 74
Tuning the wavelength .......................................................................................74
Setting the operating mode ..............................................................................74
Auto start ................................................................................................................74
Setting the emission delay ............................................................................... 75
Narrow and wide range setting ...................................................................... 75
Setting the wavelength modulation source ................................................. 76
Setting the wavelength modulation signal coupling ..................................77
Internal generator frequency ............................................................................78
Internal generator amplitude ............................................................................78
Internal generator signal waveform ................................................................78
Internal generator -signal output .................................................................... 79
Wavelength modulation on/off ........................................................................ 80
Trigger setting input/output ............................................................................. 80
Trigger indicates emission ................................................................................ 81
Trigger sawtooth wavelength modulation .................................................... 81
Readings ..................................................................................................................... 82
Errors and status indicators ................................................................................... 83
Status indicators .................................................................................................. 83
Error codes ........................................................................................................... 83
Graphing ..................................................................................................................... 83
Section 3 INSTALLING THE LASER 85
7 Mechanical Installation ....................................................................................................87
General ........................................................................................................................ 87
Standalone mounting .............................................................................................. 87

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Heat dissipation ...................................................................................................87
Slide-in mounting ..................................................................................................... 88
Operating and storage environment ............................................................. 90
8 Connecting the Laser ........................................................................................................91
Connecting the safety interlock ............................................................................ 91
Interlock operation .............................................................................................. 91
Lemo connector ................................................................................................... 91
Connecting an interlock switch ...................................................................... 92
Connecting power ................................................................................................... 93
Connecting modulation signals ............................................................................ 93
BASIK interface board ....................................................................................... 93
Connecting the trigger input or output ............................................................... 96
Input trigger .......................................................................................................... 96
Output trigger ...................................................................................................... 96
Connecting the optical output ...............................................................................97
Appendices
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 Email .....................................................................................................106
Online support web-page ...............................................................................106
Shipping address ...............................................................................................106
C Interface Pin Assignments ............................................................................................ 107
Main electrical interface ........................................................................................107
D CONTROL Software .......................................................................................................109
Installing CONTROL ................................................................................................109

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E RS-485 adapter .................................................................................................................115
Main adapter ........................................................................................................115
F Configuration ID ............................................................................................................... 117
Module Configuration ID ................................................................................... 117

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TABLES
Table 1: BASIK variant specifications............................................................................... 22
Table 2: Recommended power modes ...........................................................................27
Table 3: Optical Interface Specifications ....................................................................... 31
Table 4: Status LEDs............................................................................................................ 32
Table 5: Module labels........................................................................................................ 33
Table 6: Wavelength modulation settings ..................................................................... 36
Table 7: Narrow vs wide band wavelength modulation............................................. 40
Table 8: Koheras BASIK PC connection kit ....................................................................47
Table 9: CONTROL panels and menu items ..................................................................57
Table 10: Generic user interface registers......................................................................73
Table 11: Power adapter specifications........................................................................... 93
Table 12: Wavelength modulation pin descriptions .................................................... 95
Table 13: Extra I/O pin descriptions ................................................................................. 95
Table 14: Optical ..................................................................................................................101
Table 15: Mechanical dimensions ...................................................................................101
Table 16: Operating and storage environment ............................................................101
Table 17: Electrical...............................................................................................................102
Table 18: Safety and regulatory compliances .............................................................102
Table 19: Main electrical interface pin assignment.....................................................107
Table 20: RS-485 adapter status LEDs...........................................................................115
Table 21: Standard BASIK Configuration IDs................................................................. 117

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FIGURES
Figure 1: BASIK front panel ................................................................................................ 21
Figure 2: BASIK front panel layout .................................................................................. 24
Figure 3: BASIK rear panel layout ................................................................................... 25
Figure 4: Frequency response using wavelength modulation ................................ 26
Figure 5: USB-RS485 Adapter ......................................................................................... 29
Figure 6: BASIK equipped with fiber cord and FC/APC connector ....................... 30
Figure 7: Status LEDs .......................................................................................................... 31
Figure 8: Top panel label locations ................................................................................ 32
Figure 9: Front panel label locations .............................................................................. 33
Figure 10: Differential input signal for wavelength modulation ................................37
Figure 11: Single-ended to differential .............................................................................37
Figure 12: Single-ended input signal with 2.5 V .......................................................... 38
Figure 13: Single-ended input with 2.5 V on an unused branch ............................. 38
Figure 14: Single-ended input signal with GND on an unused branch ................. 39
Figure 15: Single-ended input connections with 0 V on an unused branch ........ 39
Figure 16: Differential output signal ................................................................................ 40
Figure 17: BASIK X15 wavelength modulation response ........................................... 41
Figure 18: BASIK E15/C15/Y10 wavelength modulation response .......................... 42
Figure 19: BASIK X15 in Pound-Drever-Hall configuration ........................................ 42
Figure 20: GUI panel navigation ......................................................................................57
Figure 21: Panel dragged to a new location in the main window - ....................... 58
Figure 22: Panels dragged outside the main window ............................................... 58
Figure 23: Panels dragged outside the main window ............................................... 59
Figure 24: Welcome screen and connecting ............................................................... 59
Figure 25: Status panel ...................................................................................................... 60
Figure 26: GUI settings ...................................................................................................... 62
Figure 27: Wavelength modulation - internal source ................................................. 63
Figure 28: Wavelength modulation - external source ............................................... 63

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Figure 29: Wavelength modulation - both .................................................................... 64
Figure 30: Internal generator waveform selection (Type) ........................................ 64
Figure 31: Turning on wavelength modulation ............................................................66
Figure 32: Trigger type – Input ........................................................................................ 67
Figure 33: Trigger type – Output .................................................................................... 67
Figure 34: Power & current mode controls ...................................................................68
Figure 35: Auto-start setting ............................................................................................. 68
Figure 36: View setting ...................................................................................................... 68
Figure 37: Menu items ........................................................................................................69
Figure 38: Serial monitor ...................................................................................................69
Figure 39: Serial Monitor ................................................................................................... 70
Figure 40: Wavelength controls ....................................................................................... 71
Figure 41: Operating mode set to power ....................................................................... 71
Figure 42: Setting the wavelength offset ...................................................................... 74
Figure 43: Setting the operating mode .......................................................................... 74
Figure 44: Setting the auto-start function ..................................................................... 75
Figure 45: Setting the emission delay ........................................................................... 75
Figure 46: Setting the range parameter ........................................................................ 76
Figure 47: Setting the wavelength modulation signal source ................................. 76
Figure 48: Setting the coupling type ...............................................................................77
Figure 49: Setting the internal generator frequency ................................................. 78
Figure 50: Setting the signal amplitude of the internal generator ......................... 78
Figure 51: Setting the internal generator waveform ................................................... 79
Figure 52: Toggling the internal generator signal output ........................................ 79
Figure 53: Turning ON wavelength modulation ..........................................................80
Figure 54: Setting the trigger to input or output .........................................................80
Figure 55: Trigger set to indicate emission ................................................................... 81
Figure 56: Trigger set to sawtooth wavelength modulation ..................................... 81
Figure 57: Read-only registers under the Readings tab ...........................................82
Figure 58: Error and status tab ........................................................................................ 83
Figure 59: Graphing tab ..................................................................................................... 84

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Figure 60: Heat transfer surface - BASIK rear panel ..................................................87
Figure 61: Heat transfer surface - BASIK rear panel ................................................... 88
Figure 62: Mounting the laser .......................................................................................... 89
Figure 63: Front panel mounting holes and handle ................................................... 90
Figure 64: Safety interlock connected to a door switch (open position) .............. 92
Figure 65: Power supply ................................................................................................... 93
Figure 66: BASIK interface board ................................................................................... 94
Figure 67: Trigger input circuit ......................................................................................... 96
Figure 68: Trigger output circuit .......................................................................................97
Figure 69: Mechanical dimensions ............................................................................................ 103
Figure 70: Warranty seal ..................................................................................................105
Figure 71: Main electrical interface PIN layoutl ...........................................................107
Figure 72: RS-485 adapter ................................................................................................116
Figure 73: How to read the configuration ID ................................................................ 117
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PROCEDURES
Procedure 1: Connecting CONTROL to the laser........................................................ 49
Procedure 2: Connecting the Generic User Interface to the laser.......................... 51
Procedure 3: Turning on the laser using CONTROL.................................................. 54
Procedure 4: Turning on the Laser using the Generic User Interface .................. 55
Procedure 5: Relocating panels ...................................................................................... 58
Procedure 6: Connecting the door interlock circuit................................................... 92
Procedure 7: Installing CONTROL...................................................................................109

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SECTION 1
KOHERAS BASIK DESCRIPTION
This section provides a description of the laser and its chassis types. It includes the
following topics:
•“Laser Description” on page 21
•“Module variants” on page 22
•“Main electrical Interface” on page 24
•“Laser features” on page 25
•“Miscellaneous” on page 29
•“Optical interface” on page 30
•“Laser Control” on page 31
•“Status LEDs” on page 31
•“Module labels” on page 32

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