NKT Photonics Koheras HARMONIK User manual

Item 800-604-01
Koheras HARMONIK
PRODUCT GUIDE
Low Noise Single Frequency 2nd Harmonic Laser
System

PRODUCT GUIDE
This guide includes the following NKT Photonics products:
Koheras HARMONIK
Low Noise Single Frequency 2nd Harmonic Laser System
Koheras HARMONIK Product Description Release 2.1 01-2021 W-10456

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GUIDE OVERVIEW
This product guide is intended to provide functional, operational and installation
information for the Koheras HARMONIK laser systems. The guide is divided into
three sections:
• Koheras HARMONIK Description - introduces the Koheras HARMONIK
system, its functionality, interfaces and variants.
• Installation – includes the details on how to install the system and connect
optional interfaces.
• Operations – – provides information and procedures on how to connect,
configure and manage the system.
The Koheras HARMONIK system consists of four modules. This guide provides
details for the harmonic generator module and its controller. For details on
operating the seed and amplifier lasers, refer to the following documents:
Koheras ADJUSTIK Product Guide
Koheras BOOSTIK HPA Product Guide
Warning: Do not operate the laser before first reading and understanding all
warnings, cautions and handling information stated within the document:
Koheras HARMONIK 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/
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 “HARMONIK System Description” — Describes the laser system
including its general operational principles, management and interfaces.
• Chapter 2 “Installation” — Contains information on installing and connecting
the Koheras HARMONIK.
• Chapter 3 “Operations” — Provides information on turning on, connecting,
configuring and operating the Koheras HARMONIK.

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• Appendices — The appendices contain system specifications and service and
support information.
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.
February 2020 – First release. Note that this document has been rewritten from
an earlier draft release.
September 2020 – Corrected some procedures orders and text through out.
December 2020 – Released revision 2.0 to reflect design change implementing
a built-in controller within the HARMONIK.
January 2021 – Updated support contact details in Appendix B.

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CONTENTS
Guide Overview ................................................................................................................... 3
TABLES ..................................................................................................................... 7
FIGURES ...................................................................................................................9
PROCEDURES .........................................................................................................11
1 HARMONIK System Description ....................................................................................13
Models .....................................................................................................................13
Installation ..............................................................................................................13
Optical .......................................................................................................................... 14
Output power and wavelengths .......................................................................14
Emission beam quality ........................................................................................14
Free-space or fiber output .................................................................................14
Laser classification ...............................................................................................14
HARMONIK module .................................................................................................. 15
Front panel ............................................................................................................ 15
Rear panel ............................................................................................................. 16
Optional fiber coupling ...................................................................................... 16
Miscellaneous ............................................................................................................ 16
Safety ...................................................................................................................... 16
CONTROL and CONFIGURATION .........................................................................17
Management software ........................................................................................17
Management connection ....................................................................................17
Chassis labels............................................................................................................. 19
2 Installation ............................................................................................................................21
General ........................................................................................................................ 21
Requirements ....................................................................................................... 21
Room requirements ............................................................................................ 21
Electrical supply requirements ........................................................................ 22
Installing the system ................................................................................................ 22

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Seed and amplifier modules ............................................................................ 23
Connecting the system ........................................................................................... 23
3 Operations ..........................................................................................................................27
Safety ........................................................................................................................... 27
Damage prevention ................................................................................................. 27
General ........................................................................................................................ 27
Stability .................................................................................................................. 27
Temperature Optimization ............................................................................... 28
Client software ..................................................................................................... 28
Management window .............................................................................................. 28
Temperature/Wavelength operating mode ................................................. 29
Power ..................................................................................................................... 29
Status panel .......................................................................................................... 29
Using the system ...................................................................................................... 30
Initial use ............................................................................................................... 30
Optimizing the SHG output - using temperature control .......................... 31
Optimizing the SHG output - using wavelength control ........................... 32
Auto temperature button .................................................................................. 34
Fiber procedures ................................................................................................ 34
A Specifications .................................................................................................................... 35
B Service and support Information ...................................................................................37
Servicing the laser .................................................................................................... 37
“WARRANTY...” Label .........................................................................................37
Opening the modules ........................................................................................37
Support contact details........................................................................................... 38
Support website .................................................................................................. 38
Shipping address ................................................................................................ 38

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TABLES
Table 1: HARMONIK system models................................................................................. 13
Table 2: Optical interface parameters @ 20 W BOOSTIK HP output power......... 14
Table 3: Module labels......................................................................................................... 19
Table 4: Optical module installation requirements ..................................................... 23
Table 5: Mechanical dimensions ..................................................................................... 35
Table 6: Operating and storage environment ............................................................. 35
Table 7: Electrical ................................................................................................................. 35
Table 8: Safety and regulatory compliances ............................................................... 35
Table 9: Mechanical dimensions...................................................................................... 36

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9
FIGURES
Figure 1: Optical module front panel ............................................................................... 15
Figure 2: Optical module rear panel ............................................................................... 16
Figure 3: Optical module rear panel ............................................................................... 16
Figure 4: USB connectivity ................................................................................................. 18
Figure 5: Label locations ...................................................................................................................20
Figure 6: Optical module rear panel .............................................................................. 22
Figure 7: Removing the optical input cover .................................................................. 24
Figure 8: Installing the collimator assembly ................................................................. 25
Figure 9: Replacing the optical input cover ................................................................. 25
Figure 10: Client – main window ..................................................................................... 28
Figure 11: Management client – Temperature control ................................................ 31
Figure 12: Management client – Temperature control .............................................. 33
Figure 13: Warranty seal .....................................................................................................37
white

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PROCEDURES
Procedure 1: Connecting the system.............................................................................. 23
Procedure 2: Initial use ...................................................................................................... 30
Procedure 3: Optimize second harmonic emission level using temperature ..... 32
Procedure 4: Optimize second harmonic emission level using wavelength....... 33

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1 HARMONIK System Description
The HARMONIK system is a high-power frequency doubled laser system. The system
is modular and consists of the following modules:
• HARMONIK module – the module houses the HARMONIK’s optical
components for frequency doubling the source laser beam. Specifically, this is
a photonic crystal operating at 50-65° C (for 775 fiber) that ensures high-power
delivery. The module also includes an electronic interface for control of the
module from a PC.
• Koheras ADJUSTIK – laser seed source. The emission from the ADJUSTIK is
delivered to the BOOSTIK HPA.
• Koheras BOOSTIK HPA – Amplifies the seed laser to provide up to 15 W of
power from the optical module in a standard system. Higher custom power
levels are available on request.
Note: All modules are specifically aligned at the factory and cannot be replaced with-
out NKTP support.
This guide describes the Koheras HARMONIK module in detail. For details of the
system’s seed and amplifier laser modules, refer to the following NKTP guides:
Koheras ADJUSTIK Product Guide
Koheras BOOSTIK HPA Product Guide
Models The Koheras HARMONIK system models are listed in Table 1 . The two systems are
defined in the table by their advantages and particular optical specifications.
Table 1 HARMONIK system models
Installation The HARMONIK module is designed to be placed on a table or shelf installation. The
Koheras ADJUSTIK and BOOSTIK HPA modules can be either racked mounted in a
standard 19 inch rack or directly placed on a flat surface such as table or shelf.
Model Advantage Specification
C7 Low Relative Intensity
Noise (RIN)
RIN: -140 dBc/Hz @ 10 MHz
E7 Narrow line width and low
phase noise
Line width: < 0.2 kHz
Phase noise:-87 dB(rad/√Hz/m) at 10 Hz.

Optical
14
Optical
Output power and
wavelengths
Table 2 lists standard wavelength and power specifications. Contact NKT Photonics
to discuss your requirements and options available.
Table 2 Optical interface parameters @ 20 W BOOSTIK HP output power
Note: For all other HARMONIK specifications refer to the product datasheet.
Emission beam
quality
The beam quality, M2 is less than 1.1 and is suitable for advanced quantum physics
projects such as quantum sensing and laser cooling and trapping. Contact NKT
Photonics to discuss the applications that are possible.
Free-space or fiber
output
By default, the HARMONIK systems are equipped with free-space output apertures. If
a fiber coupling is required, an efficient coupling using NKTP’s unique polarization-
maintaining single mode fiber can be included.
Laser classification The optical output is classified as a CLASS 4 laser emission.
Parameter C7 E7
Center wavelengths (nm) 766-780 and 1533-1560 766-780 and 1533-1560
SHG output power (W) >4i or >7ii
i. @ 1533-1560 nm
ii. @ 766-780 nm
>4i or >7ii
Fundamental power (W) >4i or >7ii >4i or >7ii

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HARMONIK module
HARMONIK module
Front panel The HARMONIK module front panel houses the electrical interfaces and an
optical input assembly in a cut-out along the front and right side panel as shown
in Figure 1.
Figure 1 Optical module front panel
Management port
The HARMONIK module is managed directly from a PC connected to this USB type B
port, see - “Management connection” on page 17 .
12 VDC input
Connect this Kycon KPP-4P port to the included AC mains to 12 VDC power adapter.
Collimator assembly and cover
The assembly consists of a collimator and a holder with alignment pins that insert into
the Optical module chassis for correct alignment. The assembly is aligned at the
factory so that the collimator output is aligned with the input aperture of the optical
module.
Caution: Under no circumstances should the collimator assembly be disassem-
bled by unscrewing the collimator clamp screws.
Optical input aperture
The emission from the BOOSTIK HPA is coupled through the collimator assembly to
the optical input aperture from the factory aligned collimator assembly.
1 Management USB port 3 Collimator assembly (cover off)
2 12 VDC input 4 Optical input aperture
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3
2
Caution: DO NOT REMOVE or LOOSEN
the screws marked with the Caution
symbol in this image.

Miscellaneous
16
Rear panel The rear panel houses two free-space output apertures.
Figure 2 Optical module rear panel
Fundamental output aperture
This free-space aperture emits the residual fundamental beam with vertical
polarization (z-axis in Figure 2 ).
Second harmonic output aperture
This free-space aperture emits the second harmonic beam with vertical polarization
(z-axis in Figure 2 ).
Optional fiber
coupling
Pigtail fiber coupling are available as an option and can be fitted to one or both of the
laser output apertures. The polarization axis for a fiber connector output is parallel to
the fiber coupler alignment key.
Figure 3 Optical module rear panel
Miscellaneous
Safety
Warning: The Koheras HARMONIK system emission is rated as Class 4 laser and
is therefore hazardous. Before turning on the laser, ensure to read and under-
stand all safety statements of the document:
Fundamental output 2nd Harmonic
aperture output aperture
x
z
y

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CONTROL and CONFIGURATION
Koheras HARMONIK Safety, Handling and Regulatory Information
A paper copy of this document is included with your laser. If you do not have access
it, you can download a copy from:
https://www.nktphotonics.com/lasers-fibers/support/product-manuals/
CONTROL and CONFIGURATION
Management
software
The HARMONIK module is managed using client software executable from a PC
connected over USB to the HARMONIK module. The client can be used to:
• Configure the temperature setpoint of the second harmonic conversion
crystal oven.
• Auto-configure the temperature setpoint where the optimum efficiency of the
second harmonic conversion is obtained.
• Configure the SHG wavelengths corresponding to a second harmonic crystal
oven temperature.
• Monitor the input optical power (pump) and the 2nd harmonic output power
(SHG).
• Upgrade the HARMONIK firmware.
For information regarding the client software and using it see “Operations” on
page 27 .
Note: The seed and amplifier lasers are controlled using NKT Photonics CONTROL
Graphical User Interface (GUI) software client installed on a PC or the front panel in-
terface. For managing these modules of the system, refer to their respective product
guides:
Koheras ADJUSTIK Product Guide
Koheras BOOSTIK HPA Product Guide
Note: DO NOT OPERATE the laser system until you are familiar with the controls and
have taken all precautions necessary for your region and as described in the docu-
ment: Koheras HARMONIK Safety, Handling and Regulatory Information.
Management
connection
The HARMONIK module connects to a PC over a USB2 serial connection using a a
standard Type A to B USB cable.

CONTROL and CONFIGURATION
18
Note: The maximum cable length is typically limited to 2 m.
Figure 4 USB connectivity
USB2
USB type B

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Chassis labels
Chassis labels
A Koheras HARMONIK chassis has a number of labels on it that indicate hazards,
regulatory, or manufacturing information. The labels are described in Table 3 with the
label placements shown in Figure 5 .
Table 3 Module labels
Label Panel Description
Classification -
Emission
Hazards
Top Safety information stating the laser
emission hazards and the laser’s class
rating.
Product
Information
Top Safety label showing the emission
specifications of the laser.
Manufacturing Side Manufacturing information including
address, part and serial number, date
manufactured and regulatory
compliance.
Laser Radiation
Warning
Top Safety information alert indicating this
area of the laser is near a source of
dangerous laser emissions.
Warranty Seal Side Safety information alert indicating the
location of the aperture where laser
radiation is emitted from the laser. If the
module includes a monitor output, this is
a class 1 laser output and does not
require a a label.
Laser Aperture Rear Safety information alert indicating the
location of the aperture where laser
radiation is emitted from the laser. If the
module includes a monitor output, this is
a class 1 laser output and does not
require a a label.
DANGER - INVISIBLE LASER RADIATION
AVOID EYE OR SKIN EXPOSURE TO
DIRECT OR SCATTERED RADIATION
CLASS 4 LASER PRODUCT
MAXIMUM OUTPUT POWER: 15 W
WAVELENGTH: 500 - 2100 nm
EN60825-1:2014
WARRANTY VOID IF SEAL
IS BROKEN OR REMOVED
LASER
APERTURE

Chassis labels
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Figure 5 Label locations
DANGER - INVISIBLE LASER RADIATION
AVOID EYE OR SKIN EXPOSURE TO
DIRECT OR SCATTERED RADIATION
CLASS 4 LASER PRODUCT
MAXIMUM OUTPUT POWER: 15 W
WAVELENGTH: 500 - 2100 nm
EN60825-1:2014
LASER
APERTURE
LASER
APERTURE
Rear
Top
Front
WARRANTY VOID IF SEAL
IS BROKEN OR REMOVED
Side