THORLABS HNLS008R User manual

HNLS008R, HNLS008L
Self Contained, Red HeNe Laser
System
User Guide

Table of Contents
Chapter 1Safety....................................................................................................................................3
1.1.Safety Information...........................................................................................................3
1.1.1.Safety Summary....................................................................................................................3
1.1.2.Safety Information .................................................................................................................3
1.2.Safety Instructions ..........................................................................................................5
Chapter 2Description...........................................................................................................................7
2.1.1.Laser .....................................................................................................................................7
2.1.2.Laser Power Supply ..............................................................................................................7
2.1.3.HeNe Laser Overview ...........................................................................................................8 
2.1.4.HeNe Linewidth.....................................................................................................................8
2.1.5.HeNe Polarization ...............................................................................................................10
Chapter 3Setup....................................................................................................................................11
3.1.Unpacking ......................................................................................................................11
3.1.1.Shipping Inventory ..............................................................................................................11
3.2.Mounting the Laser Head .............................................................................................12
3.3.Assembly .......................................................................................................................12
Chapter 4Operation.............................................................................................................................13
Chapter 5Troubleshooting.................................................................................................................14
5.1.Technical Failures .........................................................................................................14
5.2.Application Trouble Shooting ......................................................................................14
5.2.1.Noise, Oscillations, and Fluctuation Sources......................................................................14
Chapter 6Specifications.....................................................................................................................15
Chapter 7Mechanical Drawing...........................................................................................................16
Chapter 8Regulatory...........................................................................................................................17
Chapter 9Compliance.........................................................................................................................18
Chapter 10Thorlabs Worldwide Contacts..........................................................................................19

HNLS008R(L) Red HeNe Laser System Chapter 1: Safety
Rev C, March 23, 2015 Page 3
Chapter 1 Safety
WARNING
Laser Radiation – Avoid Exposure to Beam – Class IIIa/Class 3R Laser Product
1.1. Safety Information
1.1.1. Safety Summary
As defined by the Federal Register 21 CFR 1040.10 Laser Safety Standard, Thorlabs’ Helium Neon laser heads
are classified according to output power and wavelength. In compliance with this standard, certain performance
features and laser safety labels are provided on the product.
The American National Standards Institute publishes a laser safety standard for users, entitled American National
Standard for the Safe Use of Lasers (ANSI Z136.1). Thorlabs strongly recommends that laser users obtain and
follow the procedures described in this ANSI standard.
Copies may be obtained from:
A.N.S.I. Washington, DC. Headquarters
1819 L Street, NW (between 18th and 19th Streets), 6th floor
Washington, DC 20036
Tel: [phone]
Fax: [phone]
www.ansi.org
Laser Institute of America
13501 Ingenuity Drive, Suite 128
Orlando, FL 32826
Toll Free: [phone]
Telephone: [phone]
Fax: [phone]
www.laserinstitute.org
1.1.2. Safety Information
Classification
These laser heads do not connect directly to the mains, they are considered Installation
Category Type I. The included power supplies do connect directly to the mains, they are
considered Installation Category Type II.
The power supply provides protective earthing as one of the means of shock protection. The
following symbol is used to indicate a protective conductor terminal inside the unit.
Disconnecting from Line Power
The power supply power cord must always be accessible from the AC line-power source (receptacle). If the unit is
installed in a cabinet, the operator must be able to disconnect the unit from the line power by the system’s line-
power switch.

HNLS008R(L) Red HeNe Laser System Chapter 1: Safety
Rev C, March 23, 2015 Page 4
Power Supply Line Power Requirements
The unit can operate from any single-phase AC power source that supplies 120 (no dash), 230 (-EC), or 100 (-JP)
VAC at a frequency range of 50 to 60 Hz. It draws 0.6 A maximum. The maximum power consumption is
dependent on the configuration of each system.
Laser Safety Parameters
The parameters for the laser system are outlined in the table below, followed by classification warning labels. See
specification tables for classifications specified by the Center for Devices and Radiological Health (CDRH), a
division of the Food and Drug Administration (FDA).
Item # HNLS008R(L)
Wavelength 633 nm
Laser Classification Class IIIa (CDRH)/3R (IEC)
Min Output Power 0.8 mW
Beam Diameter (TEM00, 1/e
2
points ±3%) Ø0.48 mm
DANGER
LASER RADIATION
AVOID EXPOSURE TO BEAM
CLASS IIIa LASER PRODUCT (CDRH)
CLASS 3R LASER PRODUCT
WAVELENGTH 633 nm
MAXIMUM POWER <4 mW
IEC60825-1:2007 ed2.0
AVOID EXPOSURE
LASER RADIATION
IS EMITTED FROM
THIS APERTURE

HNLS008R(L) Red HeNe Laser System Chapter 1: Safety
Rev C, March 23, 2015 Page 5
1.2. Safety Instructions
WARNING
Use of controls or adjustments or performance of procedures other than those specified herein may
result in hazardous radiation exposure. Avoid unnecessary exposure to laser or collateral radiation
that exceeds the acceptable emission limits listed in the safety regulation guidelines 21 CFR
Subchapter J 1040.10 and 1040.11. This federal regulation is administered by the National Center for
Devices and Radiological Health under the Food and Drug Administration.
The following safety instructions must be observed whenever the unit is operated, serviced, or repaired. Failure to
comply with any of these instructions or with any precaution or warning contained in the user’s manual is in direct
violation of the standards of design, manufacture, and intended use of the unit. Thorlabs’ assumes no liability for
the customer’s failure to comply with any of these safety requirements.
Before Initializing and Operating the Unit
Inspect the unit for any signs of damage, and read the user’s guide thoroughly.
Install the unit as specified in the Setup section on page 11.
Ensure that the unit and any devices or cords connected to it are properly grounded.
Laser Safety Precautions
It is recommended that all persons who use or are near lasers be aware of the potential hazards.
Warning
The starting and operating voltages of the laser head are lethal and are specified herein. Ensure that
the power supply is turned off and unplugged before attempting to connect or disconnect the
lasers.
Do not access the interior of the power supply.
The lasers and the power supplies are not serviceable units.

HNLS008R(L) Red HeNe Laser System Chapter 1: Safety
Rev C, March 23, 2015 Page 6
Warning
To avoid the risk of injury or death,
always observe the following precautions before initializing the unit:
Never look into the end of an optical cable connected to an optical output device that is operating. Laser radiation is
invisible, and direct exposure can severely injure the human eye.
Eye and skin exposure to direct or scattered laser radiation is hazardous and is considered potentially extremely
harmful.
Install the laser in an enclosed area with access restricted to trained personnel. Clearly label the area and mark the
entrance with the class of laser (Class II, IIIa, or IIIb).
Never leave the laser on and unattended.
If the laser has a key switch on the power supply front panel, the key must be inserted and turned to enable the laser
to operate. The key is captive in the operational position. Remove the key from the laser when not in use or
unattended. Store the key in a safe place.
Limit access to the laser to personnel who are familiar with the equipment. Ensure that the laser is not assembled,
operated, or repaired by inexperienced or untrained personnel.
Ensure that all mirrors and optics used are securely positioned and fixed to prevent movement. Prevent stray
reflections from surfaces at all times.
Do not allow reflective objects to be placed in the laser beam. Laser light scattered from a reflective surface can be as
damaging as the original beam. Objects such as rings, watchbands, and metal pens or pencils can be hazardous.
Install the laser so that the laser beam is not at eye level.
Terminate the laser beam path with a suitable power meter or non-reflecting beam stop. Enclose beam stops where
possible. Consult a power meter or the beam stop manufacturers’ operating manual for proper usage.
Suitable eye protection must be worn at all times when laser output is possible.
Connect the power cord only to a power outlet equipped with a protective earth contact. Never connect to an
extension cord that is not equipped with this feature.
Do not interrupt the protective earth grounding. Any such action can lead to a potential shock hazard that can result in
serious personal injury.
Disconnect the power cord from the unit before adding or removing any components. Do not rely on electrical safety
devices or interlocks.
Some electrical components within the products may maintain electrical charge even when unplugged.
After unplugging products from the ac mains, wait a minimum of 1 minute before disconnecting the laser head from
the power supply. The emission indicator on the power supply should be off.
WARNING: When disconnecting a laser head from a power supply there may be a residual charge remaining within
the laser head and present at the exposed tips of the HV connector. Release any excess charge by shorting the tips
of the connector to a metal surface before additional handling.
Do not use the unit outdoors. To prevent potential fire or shock hazard, do not expose the unit to any source of
excessive moisture.
Operating the unit in the presence of flammable gases or fumes is extremely hazardous.
Never remove covers or panels from the units.
Do not perform any operating or maintenance procedure that is not described in the user’s manual.

HNLS008R(L) Red HeNe Laser System Chapter 2: Description
Rev C, March 23, 2015 Page 7
Chapter 2 Description
Thorlabs’ line of self-contained, low-power, red (632.8 nm) helium-neon (HeNe) gas lasers have stable output
power of 0.8 mW and a fundamental Gaussian beam. Depending on the model chosen, the output beam will be
either linearly polarized or randomly polarized (unpolarized). The state of polarization in a randomly polarized
laser beam is not truly an unpolarized source, but rather a single state of polarization that changes on a small
timescale.
2.1.1. Laser
This laser head does not have a shutter and is ready to be used out of the box. The front of the housing has a
threaded 5/8"-32 aperture (see Figure 1 below). There is a power on indicator on the top of the laser housing.
This particular laser head is designed to operate at an optimum performance level when used with the required
Thorlabs power supply.
Laser Head
Figure 1
2.1.2. Laser Power Supply
The laser includes a power supply that is specially designed to be used with the HeNe laser and is CE-certified.
There is no interlock or power indicator light on the adapter. The power supply comes pre-configured for one of
three local mains voltage: 120 VAC (no dash), 230 (-EC), or 100 VAC (-JP). See Figure 6 on page 11.
Power On Indicator
Laser Aperture

HNLS008R(L) Red HeNe Laser System Chapter 2: Description
Rev C, March 23, 2015 Page 8
2.1.3. HeNe Laser Overview
A helium-neon laser, typically called a HeNe laser, is a small
gas laser with many industrial and scientific uses. The
primary wavelength they are used at is 632.8 nm, in the red
portion of the visible spectrum.
The gain medium of the laser is a mixture of helium and neon
gases in a 5:1 to 20:1 ratio that is contained at low pressure
in a sealed glass tube. The excitation source for these lasers
is a high-voltage electrical discharge through an anode and
cathode at each end of the glass tube. The optical cavity of
the laser consists of a flat, high-reflecting mirror at one end of
the laser tube and an output coupler mirror with
approximately 1% transmission at the other end.
Optical Resonator Cavity
Figure 2
Typical HeNe Parameters
Beam Diameter (D) ≤1 mm (1/e^2)
Cavity Length (L) 0.15 m (0.5 mW) to 1 m (50 mW)
Reflectivity at High Reflector (HR) >99.99%
Transmission at Output Coupler (OC) ~1%
HeNe lasers tend to be small, with cavity lengths of around 15 cm up to 0.5 m and optical output powers ranging
from 1 mW to 100 mW. Thorlabs offers output powers up to 22.5 mW.
2.1.4. HeNe Linewidth
A red HeNe laser wavelength is 632.816 nm in air, though it is often reported as either 632 nm or 633 nm. The
wavelength gain curve is actually made of several longitudinal modes that fluctuate within the range due to
thermal expansion of the cavity and other external factors.
The linewidth of a HeNe laser is specific to the application. The axial mode structure of the HeNe laser is
characterized by the number of modes, the free spectral range (FSR), and the Doppler width (see Figure 3 on
page 9). The linewidth of individual axial modes is usually small (~kHz) and is primarily determined by external
factors and measurement timescales rather than fundamental laser parameters. In most interferometric
applications, the most relevant parameter is the coherence length, which is determined by the axial modes that
are furthest apart. For a red HeNe laser, the coherence length is approximately 30 cm.
D
L
Anode
High
Reflector
Output
Coupler
Helium-Neon Gas Mixture
Glass Tube
Laser Bore Tube
Cathode
HeNe Applications
Metrology
Cleanroom Monitoring Equipment
Food Sorting
Flow Cytometry
Confocal Microscopy
Imaging and Medical Equipment
Opacity Monitoring
Alignment
Maritime Visual Guidance Systems

HNLS008R(L) Red HeNe Laser System Chapter 2: Description
Rev C, March 23, 2015 Page 9
HeNe Gain Curve Showing Cavity Modes
Figure 3
The laser process in a HeNe laser starts with the collision of electrons from the electrical discharge with the
helium atoms in the gas. This excites helium from the ground state to a long-lived, metastable excited state.
Collision of excited helium atoms with ground-state neon atoms results in excited neon electrons.
HeNe Energy Levels
Figure 4
The number of neon atoms entering the excited states builds up until population inversion is achieved.
Spontaneous and stimulated emission between the states results in emission of 632.82 nm light along with other
emission wavelengths. From these states, the electrons quickly decay to the ground state. The HeNe laser’s
power output is limited because the neon upper level saturates with higher current, while the lower level varies
linearly with current.
Neon Gain
Curve
FWHM ~1.5 GHz
Frequency
Gain/Output Power
Lasing
Cavity Modes
Lasing
Threshold
FSR ~1000 MHz
Short (0.2 m) Laser
FSR ~200 MHz
Long (1 m) Laser
Energy (Electron Volts)
Ground States
Metastable Collision
Metastable Collision
e Impact
3S2
1S
3S2S2
1S
2P4
3P4
(20.66 eV)
(20.30 eV)
(20.61 eV)
(19.78 eV) (19.78 eV)
(18.70 eV)
1
2
5
10
21
20
19
18
17
16
(16.70 eV)
(3391.2 nm Laser)
(632.8 nm Laser)
(1152.3 nm Laser)
Diffusion
Helium Neon

HNLS008R(L) Red HeNe Laser System Chapter 2: Description
Rev C, March 23, 2015 Page 10
The laser cavity can be designed with the correct mirrors and length to promote other wavelengths of laser
emission. There are infrared transitions at 3.39 μm and 1.15 μm wavelengths, and a variety of visible transitions,
including a green (543.365 nm, sometimes called GreeNe laser), a yellow (593.932 nm), a yellow-orange
(604.613 nm), and an orange (611.802 nm) transition. The typical red, 633 nm wavelength output of a HeNe laser
actually has a much lower gain compared to other wavelengths, such as the 1.15 μm and 3.39 μm lines.
HeNe Visible Laser Lines
Figure 5
2.1.5. HeNe Polarization
Unpolarized (Randomly Polarized) Beam
The output of an unpolarized HeNe laser consists of a rapidly fluctuating, linearly polarized beam whose
polarization orientation changes on a nanosecond time scale. Unpolarized lasers are ideal for applications where
there are no polarizing elements in the beam path. Depending on the time scale of an application, large power
fluctuations are possible.
Linear Polarized Beam
The state of polarization in a polarized HeNe laser beam is linear, making these lasers ideal for polarization-
sensitive applications.
500 550 650
Wavelength (nm)
HeNe Visible Laser Lines
750600 700

HNLS008R(L) Red HeNe Laser System Chapter 3: Setup
Rev C, March 23, 2015 Page 11
Chapter 3 Setup
3.1. Unpacking
Inspect the packing container for any damage that may have occurred during shipment. Contact your local
Thorlabs customer service office for assistance. Packing materials are specifically designed to protect against
shipping damage. Please keep this container and reuse it if your system needs to be returned to Thorlabs for
service or evaluation.
Carefully remove the laser system from the packing container. Inspect for damage, including dents and scratches.
There should not be anything rattling around inside the laser. Rarely, during shipping, the glass tube may break.
Laser System
Figure 6
3.1.1. Shipping Inventory
The equipment included in this shipment should match the packing slip attached to the box. Verify that the correct
product was shipped to you by identifying the item number on the box. If the shipment is incomplete, or if an
incorrect item was shipped to you, please notify Thorlabs immediately.
This package should contain:
Laser System
Power Adapter
User Guide and Quick Start Guide
Power Supply Adapte
r
Laser Head

HNLS008R(L) Red HeNe Laser System Chapter 3: Setup
Rev C, March 23, 2015 Page 12
3.2. Mounting the Laser Head
The square housing allows for quick and stable setup on any flat work surface. No special or additional equipment
is required to mount the laser. The front aperture has an internal 5/8"-32 threaded mounting port which can be
adapted to be used with a variety of our SM1 threaded optomechanical devices using an SM1A32 Adapter.
Front and Back of Laser Head
Figure 7
3.3. Assembly
It is suggested that the HeNe Laser Quick Start Guide (a separate document found enclosed with the laser) be
used to assemble the laser system. Listed below are the steps needed to assemble the laser system.
This laser system includes a fixed-voltage power adapter that is factory-set for either 120 (no dash), 230 (-EC), or
100 (-JP) VAC operation. The laser must be purchased correctly configured for the appropriate regional current.
The proper mains voltage plug must also be used.
1) Make sure the laser head is secured to your work surface and pointed safely away from people and
directed into a beam block, beam dump, or similar non-reflective surface.
2) Plug the power adapter into the back of the laser housing.
3) Plug the AC connector into the mains outlet.
Power Toggle
Switch
Laser Aperture
The external thread
is a 5/8"-32
Power Adapte
r
Receptacle

HNLS008R(L) Red HeNe Laser System Chapter 4: Operation
Rev C, March 23, 2015 Page 13
Chapter 4 Operation
To operate the laser system, follow the following procedures:
1) Make sure that the laser is pointing safely away from people and is securely mounted and directed into a
beam block, beam dump or similar non-reflective surface.
2) Push the toggle switch on the back of the unit to the on position. The “Laser On” LED indicator will light.
Note: There is no safety delay before the unit starts. When the toggle switch is turned on, the unit will
begin to lase.

HNLS008R(L) Red HeNe Laser System Chapter 5: Troubleshooting
Rev C, March 23, 2015 Page 14
Chapter 5 Troubleshooting
5.1. Technical Failures
Problem Fix
No light is being emanating from
the laser.
Make sure that the aperture is open.
Check to make sure that
the power supply is plugged into a working outlet, and
the connector is fully seated into the back of the laser
housing.
The laser does not work and
there is something rattling
around inside the laser head.
The glass gas tube may have broken during shipping. Please contact
your local tech support office for help.
The laser has low output power. The laser requires 10 minutes to meet published specifications. Make
sure to let it warm up.
5.2. Application Trouble Shooting
Some sources of trouble of a HeNe laser do not come from the laser failing or being out of spec. In some cases,
these laser are not suited to the application. One common mis-application comes from a HeNe laser, especially a
low power laser (~0.5 mW), being used in a metrology application.
Environment is an important consideration as well. Dirty environments can cause the optics to become
contaminated and the power output to drop below expected levels. Unstable output beams can be caused by
noisy environments with large sources of vibrations. Proper mounting on an optical table can reduce the effects of
ambient vibrations. Temperature is also a factor. If the environment where the laser is being used fluctuates in
temperature, the output power can experience a large amplitude change. Even blowing on the laser tube can
cause the output power to fluctuate significantly.
Randomly polarized lasers are actually rapidly changing, single polarization lasers. When averaged over time, the
light emitted from these lasers appears randomly polarized. However, any polarization optics in the path
(intentional or unintentional) can cause large variations in the output power. Only polarized lasers should be used
in applications that involve polarization optics.
While HeNe lasers are less sensitive to variations caused by back reflections, they are not immune to them. Large
retro-reflections back into the laser can cause unpredictable power changes. A free-space isolator can be used to
reduce or eliminate these effects. If possible, only a small angular deviation is needed to eliminate the back
reflections.
These HeNe lasers are ill suited to any application or experiment where a single frequency or long coherence
length is required.
5.2.1. Noise, Oscillations, and Fluctuation Sources
There are many sources of noise, oscillations and fluctuations of the output of a HeNe laser. One of the most
common is from longitudinal modes drifting into and out of the gain curve. The frequency of these fluctuations
vary from less than a Hz to as high as several kHz, depending on the stability of the environment.
Other, more constant sources of fluctuations are from the following (with corresponding frequencies):
Line Noise from AC High-Voltage Power Supplies (50/60 Hz, 100/120 Hz, etc.)
Switching Noise from DC High-Voltage Power Supplies (40 kHz)
Plasma Oscillation (Tens of MHz)
Transverse Mode Beat Notes (Hundreds of MHz)
Axial Mode Beats (at FSR, Hundreds of MHz)

HNLS008R(L) Red HeNe Laser System Chapter 6: Specifications
Rev C, March 23, 2015 Page 15
Chapter 6 Specifications
Item # HNLS008R HNLS008L
Wavelength 632.8 nm
Min Output Power (TEM00, 633 nm) 0.8 mW
Min Polarization Ratio (Min) – 500:1
Beam Drift Not Specified
Long Term Beam Drift Not Specified
Beam Diameter (TEM00, 1/e points + 3%) 0.48 mm
Beam Divergence (TEM00, + 3%) 1.7 mrad
Longitudinal Mode Spacing 1090 MHz
Max Noise (RMS) (30 Hz to 10 MHz) 1.0%
Max Drift with Respect to Mean Power,
Over 8 hr ±2.5%
Max Mode Sweeping Contribution 10%
Beam Pointing Stability Not Specified
Physical/Mechanical Characteristics HNL008R(L)
Max Warm-up Time (95% power) 10 min
Expected Operating Lifetime Not Specified
Storage Lifetime Indefinite (Hard-Sealed)
Static Alignment Approximately 1.75" from Base
Laser Weight 3.99 lbs, (1.81 kg)
Environmental HNL008R(L)
Temperature, Operating -40 to 60 °C
Temperature, Non-operating -40 to 100 °C
Altitude, Operating 0 to 10,000 ft
Altitude, Non-Operating 0 to 70,000 ft
Relative Humidity (non-condensing) 0 to 100%
Shock 25 g for 11 ms, 100 g for 1 ms
Safety HNL008R(L)
CDRH/IEC 60825-1 Class IIIa/3R

HNLS008R(L) Red HeNe Laser System Chapter 7: Mechanical Drawing
Rev C, March 23, 2015 Page 16
Chapter 7 Mechanical Drawing
Dimensional Drawing
Figure 8
6.90in
175.3mm
2.00in
50.8mm
2.50in
63.5mm
0.45in
11.4mm
0.45in
5/8in-32
Inner Thread
11.4mm
6.00in
152.4mm

HNLS008R(L) Red HeNe Laser System Chapter 8: Regulatory
Rev C, March 23, 2015 Page 17
Chapter 8 Regulatory
As required by the WEEE (Waste Electrical and Electronic Equipment Directive) of the European Community and
the corresponding national laws, Thorlabs offers all end users in the EC the possibility to return “end of life” units
without incurring disposal charges.
This offer is valid for Thorlabs electrical and electronic equipment:
Sold after August 13, 2005
Marked correspondingly with the crossed out “wheelie bin” logo (see right)
Sold to a company or institute within the EC
Currently owned by a company or institute within the EC
Still complete, not disassembled and not contaminated
As the WEEE directive applies to self-contained operational electrical and electronic products, this end of life take
back service does not refer to other Thorlabs products, such as:
Pure OEM products, that means assemblies to be built into a unit by the user (e. g. OEM laser driver
cards)
Components
Mechanics and optics
Left over parts of units disassembled by the user (PCB’s, housings etc.).
If you wish to return a Thorlabs unit for waste recovery, please contact Thorlabs or your nearest dealer for further
information.
8.1. Waste Treatment is Your Own Responsibility
If you do not return an “end of life” unit to Thorlabs, you must hand it to a company specialized in waste recovery.
Do not dispose of the unit in a litter bin or at a public waste disposal site.
8.2. Ecological Background
It is well known that WEEE pollutes the environment by releasing toxic products during decomposition. The aim of
the European RoHS directive is to reduce the content of toxic substances in electronic products in the future.
The intent of the WEEE directive is to enforce the recycling of WEEE. A controlled recycling of end of life products
will thereby avoid negative impacts on the environment.
Wheelie Bin Logo

HNLS008R(L) Red HeNe Laser System Chapter 9: Compliance
Rev C, March 23, 2015 Page 18
Chapter 9 Compliance
FDA-CDRH Compliance
Under the US FDA CDRH, the lasers conform to the Code of Federal Regulations (CFR), Title 21, Subchapter J,
which pertains to laser safety and labeling. See www.fda.gov/cdrh/radhlth/cfr/21cfr1000-1050.pdf for more
information.
If the end user integrates this equipment into another product, it is the customer’s responsibility to ensure CDRH
certification of their instrument.
CE Compliance
The HNL Series lasers comply with the following standards:
IEC/EN 60825-1 Concerning Laser Safety
IEC/EN 61010-1 Concerning Electrical Safety
EN61326 Concerning EMC
The HNL Series power supplies comply with the following standards:
IEC/EN 61010-1 Concerning Electrical Safety
EN61326 Concerning EMC
Conditions of Acceptability
When installed in the end product, consideration shall be given to the following:
A suitable fire enclosure shall be provided in the end product.
Safety interlock switch, key switch, laser housing and laser beam attenuator in accordance with laser
safety standards shall be provided in the end product.
A visual or audio indicator, in accordance with laser safety standards, shall be provided in the end
product.
The unit's thermal circuitry shall be evaluated in the end product.
Compliance with FDA or other laser safety standards shall be determined in the end-use application.
The end user must provide his or her own safety monitoring mechanism to shut down a power supply if it
fails to start the laser after several seconds.
The end user must use laser power supplies that provide a protective earth ground wire connected to the
mains ground. This wire must be able to support 25 A DC or AC RMS for one minute.
The HNL Series require that the power supply high-voltage negative output be connected to earth ground.

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5HY&0DUFKPage 1
Chapter 10 Thorlabs Worldwide Contacts
For technical support or sales inquiries, please visit us at www.thorlabs.com/contact for our most up-to-
date contact information.
USA, Canada, and South America
Thorlabs, Inc.
s[email protected]
[e-mail]
Europe
Thorlabs GmbH
[email protected]
France
Thorlabs SAS
[email protected]
Japan
Thorlabs Japan, Inc.
[email protected]
UK and Ireland
Thorlabs Ltd.
[email protected]
[e-mail]
Scandinavia
Thorlabs Sweden AB
[email protected]
Brazil
Thorlabs Vendas de Fotônicos Ltda.
[email protected]
China
Thorlabs China
[email protected]

www.thorlabs.com