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Free-Space Broadband Light Sources


  • Collimated, Free-Space Light Sources for UV, Visible, and IR
  • >1.3 W of Stable Optical Output Power
  • Long Lifespans: ≥1000 Hours

SLS401

Broadband Arc Lamp for 240 - 2400 nm

SLS303B

Replacement Silicon Nitride Globar

SLSLLG1

Liquid Light Guide Adapter

SLS402 Broadband Source, SLSLLG2 Adapter with Shutter, and Liquid Light Guide

SLS401B

Xenon Short-Arc Replacement Bulb

Application Idea

Related Items


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Item #a SLS401 SLS402 SLS301 SLS303
Lamp Type Xenon Arc Mercury-Xenon
Arc		 Stabilized
Quartz Tungsten-Halogen		 Stabilized
Silicon Nitride
Globar
Wavelength Range 240 - 2400 nm 360 - 2700 nm
360 - 3800 nm from Back Port		 550 nm - 15 µm
Color Temperature 5800 K 6000 K 3400 K 1200 K
Output Optical Powerb 1.3 W 1.6 W 4.5 W
Output Beam Diameter 35 mm
Output Power Stabilityc <0.3% 0.05% 0.05%
Optical Drift per Hour (Typ.) 0.1% 0.01% 0.01%
Optical Power Drift per °C (Typ.) 0.12% 0.1% 0.2%
Bulb Electrical Power 150 W 70 W
Lifespan (Avg.)d 2000 Hours 1000 Hours 5000 Hours
  • Complete specifications can be found on the Specs tab.
  • At the beginning of the bulb lifetime.
  • The standard deviation of optical output power in percentage, measured at room temperature over 1 hour with a 1 Hz sampling rate after 45 minutes warm-up.
  • Defined as the time it takes for the bulb output power to decrease to 50% of its initial level.
Filter Holder in Stabilized Lamp
Click to Enlarge
View Imperial Product List
Item #QtyDescription
SLS3011Stabilized Free-Space Light Source with Control Unit, 360 - 3800 nm
LCP05160 mm Cage-Compatible Mount for 2" Square Filters Up to 4 mm Thick, 8-32 Tap
ER6-P41Cage Assembly Rod, 6" Long, Ø6 mm, 4 Pack
FGT165S12" x 2" Temperature-Balancing Filter, -132 mireds
View Metric Product List
Item #QtyDescription
SLS3011Stabilized Free-Space Light Source with Control Unit, 360 - 3800 nm
LCP05/M160 mm Cage-Compatible Mount for 50 mm Square Filters Up to 4 mm Thick , M4 Tap
ER6-P41Cage Assembly Rod, 6" Long, Ø6 mm, 4 Pack
FGT165S12" x 2" Temperature-Balancing Filter, -132 mireds
The SLS301 using a 60 mm cage system to mount a color-balancing filter into an LCP05 Filter Mount.

Features

  • Xenon and Mercury-Xenon Arc Lamps for 240 - 2400 nm
  • Quartz Tungsten-Halogen Source for 360 - 3800 nm
  • Globar Source for 550 nm - 15 µm
  • Collimated Output for Free-Space Applications
  • Internally SM2-Threaded Aperture
  • Options for 60 mm and 30 mm Cage Systems

Optional Accessories

  • Liquid Light Guide Adapters with or without Integrated Electronic Shutter
  • Replacement Light Bulbs

Click to Enlarge
Collimated Output of the SLS401 Light Source

Thorlabs' Free-Space Broadband Light Sources provide stable, high-power illumination. We offer two short-arc sources with a xenon or mercury-xenon bulb for UV through NIR wavelengths, a quartz tungsten-halogen source for visible through NIR wavelengths, and a silicon nitride Globar source for IR and MIR illumination. For details, refer to the table to the right or for complete specifications, see the Specs tab above. Our quartz tungsten-halogen and silicon nitride Globar sources feature an internal feedback system to provide highly stable output power (0.05% fluctuation). Since the blackbody spectrum of these sources includes both the visible and infrared spectral ranges, these sources are ideal for integration into optical measurement equipment, such as back illumination for a test target as part of a detector calibration system.

Each source includes a lens to collimate the high-power, broadband output into a Ø35 mm beam for free-space applications. For user convenience, the collimation lens is factory set. However, it is adjustable should slight tweaks to the collimation be necessary. For additional mechanical stability, the feet are removable, allowing the source to be bolted directly to any standard imperial or metric optical table with user supplied 1/4"-20 or M6 screws, respectively. The front face features four 4-40 taps (as shown in the image to the right) for 60 mm cage rods, making these devices compatible with Thorlabs' 60 mm cage system. Using the cage system, it is possible to incorporate various optic mounts that are centered along the optical center of the lamp.

A variety of accessories is available separately below. Adapters designed to integrate Ø3 mm or Ø5 mm core liquid light guides are threaded directly onto the output port of the lamp; this does not require the removal of the collimating lens. The adapters are available with or without an integrated electronic shutter. Replacement bulbs are also available. Please see the Bulb Replacement tab for detailed instructions on how the replace the bulb in these lamps.

If a higher color temperature is desired, our color-balancing filters can be used to attenuate red light from a light source while passing blue light. This results in a beam with a higher color temperature and lower total power.

Item # SLS401 SLS402 SLS301 SLS303
Lamp Type Xenon Arc Mercury-Xenon Arc Quartz Tungsten-Halogen Silicon Nitride Globar
Wavelength Range 240 - 2400 nm 360 - 2700 nm
360 - 3800 nm from the Back Port		 550 nm - 15 µm
Color Temperature 5800 K 6000 K 3400 K ±15 K 1200 K
Output Optical Powera >1.3 W >1.6 W 4.5 W
Typical Spectral Output 0.1 W (200 - 400 nm)
0.2 W (400 - 700 nm)
1 W (700 - 2800 nm)		 0.16 W (200 - 400 nm)
0.24 W (400 - 700 nm)
0.9 W (700 - 2800 nm)		 0.05 W(200 - 400 nm)
0.15 W (400 - 700 nm)
1.4 W (700 - 2800 nm)		 0.1 W (400 - 700 nm)
4.4 W (700 - 15 000 nm)
Optical Power Stabilityb <0.3% 0.05% 0.05%
Optical Drift per Hour (Typical) 0.1% 0.01% 0.01%
Optical Power Drift per °C (Typical) 0.12% 0.1% 0.2%
Output Beam Diameter 35 mm
Beam Divergencec 3.2° 3.5° -
Bulb Electrical Power 150 W 70 W
Lamp Housing Dimensions
(L × W × H)		 214.7 mm × 217.0 mm × 261.2 mm
(8.41" × 8.54" × 10.28")		 213.6 mm × 217.0 mm × 261.2 mm
(8.41" × 8.54" × 10.28")		 213.7 mm × 217.0 mm x 261.2 mm
(8.41" × 8.54" × 10.28")
Controller Dimensions
(L × W ×H)		 350.0 mm × 200.0 mm × 82 mm
(13.75" × 7.87" × 3.23")		 300.0 mm × 150.0 mm × 79.5 mm
(11.81" × 5.91" × 3.13")		 299.9 mm × 149.8 mm × 80.2 mm
(11.81" × 5.90" × 3.16")
Bulb Lifespan (Average) 2000 Hoursd 1000 Hourse 5000 Hourse
Operating Temperature 0 °C to 45 °C 0 °C to 35 °C
Storage Temperature -15 °C to 70 °C
  • At the beginning of the bulb lifetime.
  • Standard deviation of optical output power in percentage, measured at room temperature over 1 hour with a 1 Hz sampling rate after 45 minutes warm-up.
  • Half Angle at 587 nm
  • Defined as the time it takes for the bulb output power to decrease to 50% of its initial level.
  • Defined as the time elapsed when the controller cannot stabilize the output power of the bulb.

Bulb Specifications

Short-Arc Bulbs
Item # SLS401B SLS402B
Wavelength Range 240 - 2400 nm
Bulb Type Xenon Mercury-Xenon
Color Temperature 5800 K 6000 K
Bulb Electrical Power 150 W
Glass Envelope Material Ozone-Free Quartz
Arc Gap 1.9 mm
Brightness (Avg.) 18 000 Cd/cm2
Luminous Flux 2800 Lumens
Light Intensity 280 Cd
Solid Angle of Output 10 Steradians
Lifespan (Avg.) 2000 Hours
Operating Voltage 17.5 VDC
Current 8.5 A (Nominal)
Quartz Tungsten-Halogen Bulb
Item # SLS301B
Wavelength Range 360 - 3800 nm
Bulb Type Quartz Tungsten-Halogen
Color Temperature 3400 K
Bulb Electrical Power 150 W
Glass Envelope Material Quartz
Filament Dimensions (Typ.) 6.5 mm x 1.3 mm x 3.3 mm
Filament Turns 20
Luminous Flux 3700 Lumens
Lifespan (Avg.) 1000 Hours
Operating Voltage 24 V
Silicon Nitride Globar Module
Item # SLS303B
Wavelength Range 550 nm - 15 µm
Element Type Silicon Nitride Globar
Color Temperature 1200 K
Bulb Electrical Power 70 W
Emitter Dimensions (Typ.) Ø4.5 mm x 17 mm
Lifespan (Avg.) 5000 Hours
Operating Voltage 12 V

Liquid Light Guide Adapter Specifications

Item # SLSLLG1 SLSLLG2 SLSLLG3
Wavelength Range Uncoated: 185 nm - 2.1 µm AR Coated: 350 nm - 700 nm; Ravg < 0.5%
Integrated Electronic Shutter No Yesa No
Lens LA4464 ACL5040U-A
Lens Material UV Fused Silica B270 Optical Crown Glass
Coupling Efficiency SLS401 / SLS402 >30% (3 mm LLG); >35% (5 mm LLG) >30% (3 mm LLG); >40% (5 mm LLG)
SLS301 >15% (3 mm LLG); >25% (5 mm LLG) >20% (3 mm LLG); >30% (5 mm LLG)
  • The external controller included with the SLSLLG2 is the same as the one included with the SHB1. For additional information, please see the full presentation here.

Xenon and Mercury-Xenon Arc Lamp Sources

Mercury Xenon Arc Lamp Spectrum
Click to Enlarge
Click for Raw Data
The measured spectral power distribution for the SLS402 Light Source. This source uses a mercury-xenon bulb that features stronger emission lines in the blue and UV region of the spectrum. The spectrum is plotted on a log scale so that both the underlying shape and spectral lines are visible; prominent mercury lines are called out in the graph.
Xenon Arc Lamp
Click to Enlarge
Click for Raw Data
The measured spectral power distribution for the SLS401 Light Source. The spectrum is plotted on a log scale so that both the underlying shape and spectral lines are visible.
Xenon Arc Lamp
Click to Enlarge
The power output and temperature of the SLS401 were monitored over a period of 28 hours of continuous operation.

Stabilized Quartz Tungsten-Halogen Source

Stabilized Light Source Stability
Click to Enlarge
The output of the SLS301 stabilized light stability over 28 hours of continuous operation. The lamp was run for 30 minutes to warm up and stabilize before this data was taken.
Stabilized Quartz-Tungsten-Halogen Light Source
Click to Enlarge
Click for Raw Data
The calculated spectral power distribution for the SLS301 Light Source.

Stabilized Silicon Nitride Globar Source

Stabilized Light Source Stability
Click to Enlarge
The output of the SLS303 stabilized light stability over 55 hours of continuous operation. The lamp was run for 60 minutes to warm up and stabilize before this data was taken. The temperature was held at 25 ± 2 °C.
Stabilized Quartz-Tungsten-Halogen Light Source
Click to Enlarge
Click for Raw Data
The measured spectral power distribution for the SLS303 Light Source compared to a 1200 K black body. The measured data does not extend beyond 5.6 µm due to spectrometer limitations.
Bulb Handling
Click to Enlarge
The bulb can be held by its electrodes with gloved hands. Avoid making contact with the bulb envelope.

Bulb Handling

The bulbs used in broadband light sources have a high internal pressure and operate at a very high temperature. If handled incorrectly, they will become a serious hazard to users and could potentially cause severe injury. It is critical to follow safety instructions when handling them.

The guidelines below describe correct bulb handling.

  • Due to the high internal pressure, the bulb of a broadband light source can burst when handled incorrectly, even when not in operation, causing serious injuries. Always wear eye/face and body protection when handling a bulb.
  • Never bump, drop, apply excessive stress, or scratch the bulb. This could cause it to burst.
  • Always transport the bulb in the provided protective case or cover until installation.
  • Save the protective case or cover and packaging materials (box) for bulbs that have been used to their rated service life.
  • Any dust or grease on the bulb will compromise the integrity of the bulb envelope, increasing the chance that the bulb will burst. Clean any dirt, oil, or lint away from the bulb with alcohol and a lint free cloth or tissue.
  • Always wear gloves when handling the bulb; never hold the bulb by its envelope. Thorlabs offer gloves that can be used for bulb handling.
  • The bulb generates very high-intensity light output; never stare directly into the bulb.
  • The bulb gets very hot during operation. Always wait at least 30 minutes for the bulb to cool down before handling the bulb after operation.
  • Electrostatic discharge (ESD) protection is recommended when handling the bulb.

 

Light Source Item # SLS401 SLS402 SLS301 SLS303
Compatible Replacement
Bulb Item #		 SLS401B (Xenon)
or SLS402B (Mercury Xenon)a		 SLS301B SLS303B
  • The SLS401 includes an SLS401B bulb, and the SLS402 includes an SLS402B bulb.

Bulb Installation

The installation instructions and video below detail the recommended procedure for replacing the bulbs in the Free-Space Light Sources. Do not attempt to change the light bulb while the bulb and unit are hot. Allow at least 30 minutes after turning the lamp off before attempting to replace the light bulb.

We strongly recommend wearing gloves when replacing the bulb to prevent skin oils from being deposited onto the bulb. If you suspect the bulb is dirty, carefully clean it with alcohol before connecting it to a power supply.

 

Xenon or Mercury Xenon Arc Lamp

Bulb Handling

The bulb of an arc lamp requires caution during handling. When handled correctly, the bulb is a very safe instrument; however, improper handling can be hazardous to users.

  • Always wear proper protective gloves when handling the bulb. Moisture and grease from the hands left on the bulb may affect the integrity of the bulb envelope, shortening the bulb lifetime. In the most extreme cases, it can cause the bulb to explode.
  • Only hold the bulb at its electrodes. Avoid holding the bulb by the glass envelope.
  • Keep the glass envelope clean at all times.
  • When not using the bulb, always seal the bulb in the bulb in the original package.
  • The temperature of the bulb may reach several hundred degrees Celsius during operation. Always wait at least 30 minutes for the bulb to cool down before handling.

Open the Lamp Housing

  1. Using a 4 mm hex key, remove the screws on the side plate. An engraving on the top of the unit indicates which side plate to remove.

Remove the Old Bulb

  1. Loosen the two thumbscrews locking the bulb in place by turning them counterclockwise.
  2. Remove the anode (+) connector from the top of the bulb.
  3. Remove the old bulb by lifting it out of the bottom holder while holding onto the top electrode. Place it in the original bulb box.

Install the New Bulb

  1. Orient the new bulb so that the anode is at the top.
  2. Insert the cathode into the base.
  3. Place the anode connector over the anode and make sure that the bulb is securely inserted.
  4. Tighten both thumbscrews by rotating them clockwise.
  5. Replace the side panel and secure with the four M5 cap screws.

 

Stabilized Quartz Tungsten-Halogen Lamp

Open the Lamp Housing

  1. Using a 4 mm hex key, remove the screws on the side plate. An engraving on the top of the unit indicates which side plate to remove.

Remove the Old Bulb

  1. Loosen the two thumbscrews locking the bulb in place by turning them counterclockwise.
  2. Remove the old bulb by holding the flat part beneath the bulb envelope. The bulb can be rested in the temporary bulb holder inside the lamp housing.

Install the New Bulb

  1. Insert the new bulb into the bulb base.
  2. Tighten the two thumbscrews by rotating them clockwise.
  3. Replace the side panel and secure with the four M5 cap screws.

 

Stabilized Silicon Nitride Globar Lamp

Please note that the Globar modules should only be handled with protective gloves.

Open the Lamp Housing

  1. Using a 4 mm hex key, remove the screws on the side plate. An engraving on the top of the unit indicates which side plate to remove.

Remove the Old Globar Module

  1. Undo the orange clips holding the Globar wires in place.
  2. Using a 2 mm hex key, loosen the setscrew on top of the Globar module and remove the screw on the side by turning them counterclockwise.
  3. Remove the old module from the socket.

Install the New Module

  1. Route the white wires and insert the new module into the socket.
  2. Insert the wires into their sockets and engage the orange clips.
  3. Insert the side screw and then retighten the top setscrew to secure the bulb.
  4. Replace the side panel and secure with the four M5 cap screws.

SLS401 and SLS402 Connector

Filter Holder in Stabilized Lamp4 Pin Female Connector
4 Pin Female Connector
Pin Connection
1 Bulb Cathode
2 Bulb Anode
3 Bulb Detection Resistor
4 Bulb Detection Resistor

SLS301 and SLS303 Connectors

Filter Holder in Stabilized Lamp10 Pin Female Connector
10 Pin Female Connector
Pin Connection Pin Connection
1 Bulb Ground 6 Ground
2 SLS301: Bulb +24 V
SLS303: Bulb +12 V		 7 Ground
3 Ground 8 +12 V
4 Monitor PD Signal 9 Signal Ground
5 Signal Ground 10 Ground

BNC Female

Monitor Photodiode Out
SLS301: 0 to 4 V
SLS303: 0 to 5 V

SLSLLG2 Shutter Interface Connector

SHB1 4-Pin Mini-Din Female Plug
Female Jack on Controller
SHB1 4-Pin Mini-Din Female Plug
Male Plug on 35" (889 mm) Long Shutter Cord
4-Pin Mini-DIN Connector
Pin Connection
1 Shutter Detect
2 Modulation +
3 +5 VDC
4 Modulation -
Shield GND

External Modulation Input: TTL 0 to 5 V, Female BNC

Interlock Output: 2.5 mm Mono Phone Jack


Posted Comments:
Bastien Arnal  (posted 2019-04-15 14:09:19.603)
Hello, What is the pulse duration on your series of Free-Space Broadband Light Sources ? Is it in the range of 10's of ns? Thanks
YLohia  (posted 2019-04-16 08:52:51.0)
Hello, unfortunately, direct modulation of these sources is not possible. You would need some sort of an external modulator such as the SLSLLG2 shutter for this, but that is only capable of 10-15 Hz.
gregor.belusic  (posted 2016-03-08 13:56:10.183)
Is the housing compatible with Osram XBO bulbs?
besembeson  (posted 2016-03-11 09:57:52.0)
Response from Bweh at Thorlabs USA: Yes it is. However, the only Osram bulb we have proof tested on our SLS401/402 is the XBO 150W/CR OFR. Others like the XBO 150 W/1 and XBO 150 W/4 will work but the performance will not be guaranteed as we have not tested these.

Below is a selection guide for all of our white-light, broadband light sources (or lamps). In addition to these sources, Thorlabs also offers unmounted white-light LEDs, white-light mounted LEDs, white-light fiber-coupled LEDs, and high-powered, white-light Solis™ LEDs.

Broadband Light Source Selection Guide
Item # (Click to
Enlarge;
Not to Scale)		 Emitter Type Wavelength
Range
(Click for Plot)		 Output Coupling Output Power Bulb
Electrical
Power		 Color
Temperature		 Bulb Lifetime
(Avg.)		 Replacement
Bulb
SLS204 Deuterium 200 - 700 nm Free Space or
Fiber Coupled (SMA)		 2 mWa
0.1 mWb
(Typ.)		 30 W N/A 2000 hc SLS254B
SLS401 Xenon Arc 240 - 2400 nm Free Spaced >1.3 Wa 150 W 5800 K 2000 hc SLS401B
SLS402 Mercury-Xenon Arc 240 - 2400 nm Free Spaced >1.3 Wa 150 W 6000 K 2000 hc SLS402B
HPLS301(/M) RF-Driven Plasma 350 - 800 nm Free Space 9.5 Wa (Typ.) - 6000 K 10 000 hc HPLSB
HPLS343 350 - 800 nm Ø3 mm Liquid
Light Guide		 4 We (Typ.) - 6000 Kf 10 000 hc HPLSB
HPLS345 350 - 800 nm Ø5 mm Liquid
Light Guide		 7 We (Typ.) - 6000 Kf 10 000 hc HPLSB
SLS201L(/M) Quartz
Tungsten-Halogen		 360 - 2600 nm Free Spaced or
Fiber Coupled (SMA)		 500 mWa
10 mWg		 9 W 2796 K 10 000 h SLS251
SLS301 360 - 3800 nm Free Spaced >1.6 Wa 150 W 3400 K 1000 hh SLS301B
OSL2 Typical
Spectrum		 Fiber Bundle 1.4 Wi 150 W 3200 K 1000 to
10 000 hc		 OSL2B,
OSL2B2,
or OSL2BIR
QTH10(/M) 400 - 2200 nm Free Space 50 mW (Typ.) 10 W 2800 Kj (Typ.) 2000 h QTH10B
SLS202L(/M) Tungsten 450 nm - 5.5 µm Free Spaced or
Fiber Coupled (SMA)		 400 mWa
2 mWk		 7.2 W 1900 K 10 000 h SLS252
SLS203L(/M) Silicon Carbide Globar 500 nm - 9 µm Free Space >1.5 Wa 24 W 1500 K 10 000 h SLS253
SLS303 Silicon Nitride Globar 550 nm - 15 µm Free Space 4.5 Wa 70 W 1200 K 5000 hh SLS303B
  • Free-space optical power measured without adapters at the beginning of bulb lifetime.
  • Measured with Thorlabs' M114L01 solarization-resistant patch cable at beginning of bulb lifetime.
  • Total operation time before the maximum optical output power of the bulb reaches 50% of its original output.
  • Adapters are available separately to couple the free-space output into liquid light guides (LLGs).
  • Measured at the output of the liquid light guide, when both the bulb and the LLG are at start-of-life.
  • Prior to LLG
  • Fiber-coupled optical power, measured with included M28L01 fiber patch cable at beginning of bulb lifetime.
  • Total operation time before the controller cannot stabilize the output power of the bulb.
  • Power at Fiber Tip at Maximum Bulb Intensity
  • Color temperature will vary from unit to unit.
  • Measured with Thorlabs' MZ41L1 ZrF4 mid-IR patch cable at the beginning of bulb lifetime.

Xenon and Mercury-Xenon Short-Arc Sources: 240 - 2400 nm

Xenon Arc Lamp Spectrum
Click to Enlarge
Click for Raw Data
The measured spectral power distribution for the SLS401 Light Source. The spectrum is plotted on a log scale so that both the underlying shape and spectral lines are visible.
Mercury Xenon Arc Lamp Spectrum
Click for Details
Click for Raw Data
The measured spectral power distribution for the SLS402 Light Source. The spectrum is plotted on a log scale so that both the underlying shape and spectral lines are visible.
Xenon Arc Lamp Power Supply
Click to Enlarge
The control unit for the SLS401 or SLS402.
Xenon Arc Lamp Adjusters
Click to Enlarge
While the mirror alignment is pre-set to the optimal position, three knobs on the back of the housing allow the user to make further adjustments if desired.
Xenon Arc Lamp Mirror
Click to Enlarge
These Short-Arc Sources include a concave mirror to focus light radiated behind the bulb back towards the front aperture.
  • Short-Arc Sources for 240 - 2400 nm
  • 1.3 W Output Power Collimated in a Ø35 mm Beam
  • Low Power Fluctuations of <0.3% within 1 Hour
  • Optical Drift: 0.1% per Hour / 0.12% per °C
  • Ozone Free
  • 60 mm Cage System Compatible
  • Manual Shutter

Thorlabs' Xenon and Mercury-Xenon Short-Arc Lamps are designed to provide 1.3 W of free-space illumination over the 240 - 2400 nm range. The spectrum of each source is shown in the graphs to the right. Compared to the xenon arc lamp, the mercury-xenon lamp provides additional strong lines in the blue to UV spectral region. Each lamp provides stable illumination with power fluctuations smaller than 0.3% per hour.

The high-power output (1.3 W) is collimated into a Ø35 mm beam for free-space applications. A silver-coated mirror at the back of the housing collects light from behind the bulb and reflects it towards the front of the housing in order to maximize the output power. The mirror alignment is factory set to maximize the output, but it can also be adjusted by the user using the three adjustment knobs on the back of the housing.

These lamps are shipped with factory-installed collimation lenses. The lens tube of the collimation lens features internal SM2 (2.035"-40) threading for easy integration of SM2-threaded parts, including the liquid light guide adapter sold below. A knob on the front of the lamp housing allows a manual shutter to block the output of the lamp if desired. The front face of the lamp housing can also integrate a 60 mm cage system.

The included controller, pictured to the upper right, has two LED indicator lights for temperature and bulb status. During normal operation, both lights will be green. If the controller becomes overheated, the "Temperature" indicator will switch to red and the lamp will be automatically shut off. The "Bulb Status" indicator will show green if the correct bulb is installed or red if no bulb is present or if the wrong bulb is installed. The LCD display of the controller also shows a timer that counts down the bulb's lifespan. Note that this is estimated using the typical 2000 hour lifetime of the compatible bulbs; the actual lifetime will vary from bulb to bulb.

The large box design of the arc lamp housing allows for the safe dissipation of thermal energy produced by the 150 W bulb. When used for an extensive amount of time, the case can heat up to ~60 °C, so extensive contact with the housing should be avoided. Replacement bulbs are sold below.

The arc lamp bulbs are ozone free: they do not produce enough deep UV radiation to convert oxygen to ozone within the beam path, allowing the lamp to be safely used without the need for a system to purge the environment around the lamp of ozone.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SLS401 Support Documentation
SLS401Xenon Short-Arc Light Source with Control Unit, 240 - 2400 nm
$6,398.15
Today
SLS402 Support Documentation
SLS402Mercury-Xenon Short-Arc Light Source with Control Unit, 240 - 2400 nm
$6,398.15
Today

Stabilized Quartz Tungsten-Halogen Source: 360 - 3800 nm

Quartz-Tungsten-Halogen Light Source
Click to Enlarge
Click for Raw Data
The calculated spectral power distribution for the SLS301 Light Source.
Stabilized Lamp Power Supply
Click to Enlarge
The control unit for the SLS301.
Tungsten Lamp
Click to Enlarge
The back port provides access to uncollimated light at longer wavelengths.
Stabilized Lamp Back Aperture
Click to Enlarge
The back of the SLS301 with the removable plate taken out to incorporate 30 mm cage rods and fixed optic holder.
  • 360 - 3800 nm Stabilized Light Source
    • 360 - 2700 nm through the Front Lens
    • 360 - 3800 nm through the Back Port
  • 1.6 W Output Power Collimated in a Ø35 mm Beam
  • Closed-Loop Control for High Stability
    • Power Fluctuations of 0.05% within 1 Hour
    • Color Temperature Stability: ±15 K
  • Low Optical Drift: 0.01% per Hour / 0.1% per °C
  • 30 mm and 60 mm Cage System Compatible
  • Manual Shutter

Thorlabs' Stabilized Quartz Tungsten-Halogen Light Source provides a constant intensity, 1.6 W blackbody radiation spectrum between 360 and 3800 nm. An internal feedback system is employed to achieve a highly stable power output (0.05% fluctuation). The high-power output (1.6 W) is collimated into a Ø35 mm beam for free-space applications. Since the blackbody spectrum spans both the visible and near-infrared spectral ranges, this source is ideal for integration into optical measurement equipment, such as back illumination for a test target as part of a detector calibration system. It can also be used as an illumination source in a white light interferometer for applications such as mapping surface structure.

The SLS301 is shipped with a factory-installed collimation lens. This configuration provides 1.6 W of free-space, collimated output power in a Ø35 mm beam. The lens tube of the collimation lens features internal SM2 (2.035"-40) threading for easy integration of SM2-threaded parts, including the liquid light guide adapter sold below. A knob on the front of the box allows a manual shutter to block the output of the lamp if desired.

The front face of this lamp can integrate a 60 mm cage system, while the back face has a removable plate with four 4-40 taps to incorporate a 30 mm cage system centered around an SM1-threaded (1.035"-40) aperture. It should be noted, however, that the output from the back face is not collimated. This additional output is ideal for creating a reference signal, or to monitor the output of the SLS301 without interfering with the Ø35 mm collimated beam.

The included controller, pictured above, has three LED indicator lights for temperature, bulb status, and lifespan. During normal operation, all three will be green. If the controller becomes overheated, the "Temperature" indicator will switch to red and the lamp will be automatically shut off. The "Bulb Status" indicator will show green if the correct bulb is installed in the SLS301, or red if no bulb is present or if the wrong bulb is installed. The "Lifespan" indicator shows yellow once the bulb reaches 75% of its lifespan and red once it reaches 100%.

The large box design of the SLS301 allows for the safe dissipation of thermal energy produced by the 150 W bulb. When used for an extensive amount of time, the case can heat up to ~60 °C, so extensive contact with the housing should be avoided. Replacement bulbs are sold below.

If a higher color temperature is desired, our color-balancing filters can be used to attenuate red light from the SLS301 light source while passing blue light. This results in a beam with a higher color temperature and lower total power.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SLS301 Support Documentation
SLS301Stabilized Free-Space Light Source with Control Unit, 360 - 3800 nm
$4,082.63
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Stabilized Silicon Nitride Globar Light Source: 550 nm - 15 µm

Globar Lamp Spectrum
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Click for Raw Data
The measured spectral power distribution for the SLS303 Light Source compared to a 1200 K black body. The measured data does not extend beyond 5.6 µm due to spectrometer limitations.
Globar Arc Lamp Power Supply
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SLS303 75 W Controller
Globar MIR Lamp
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The Globar module has an integrated aluminum reflector that focuses light radiated by the Globar towards the front aperture.
  • Globar Source for 550 nm - 15 µm
  • 4.5 W Output Power Collimated in a Ø35 mm Beam
  • Low Power Fluctuations of <0.05% within 1 Hour
  • Optical Drift: 0.01% per Hour / 0.2% per °C
  • 60 mm Cage System Compatible
  • Manual Shutter

Thorlabs' Silicon Nitride Globar Lamp is designed to provide 4.5 W of free-space illumination over the 550 nm - 15 µm range. An internal feedback system is employed to achieve a highly stable power output (0.05% fluctuation). The high-power output is collimated into a Ø35 mm beam for free-space applications. An aluminum reflector collects light from the silicon nitride Globar element and reflects it towards the front of the housing in order to maximize the output power. The mirror alignment is factory set to maximize the output, but it can also be adjusted by the user using the three adjustment knobs on the back of the housing.

The lamp is shipped with a factory-installed, uncoated zinc selenide (ZnSe) collimation lens. The lens tube of the collimation lens features internal SM2 (2.035"-40) threading for easy integration of SM2-threaded parts. Please note that the SLS303 should not be used with our liquid light guides due to the MIR radiation. A knob on the front of the lamp housing allows a manual shutter to block the output of the lamp if desired. The front face of the lamp housing can also integrate a 60 mm cage system.

The included controller, has three LED indicator lights for temperature, bulb status, and lifespan. During normal operation, all three will be green. If the controller becomes overheated, the "Temperature" indicator will switch to red and the lamp will be automatically shut off. The "Bulb Status" indicator will show green if the correct bulb is installed in the SLS303, or red if no bulb is present or if the wrong bulb is installed. The "Lifespan" indicator shows yellow once the bulb reaches 75% of its lifespan and red once it reaches 100%.

The large box design of the lamp housing allows for the safe dissipation of thermal energy produced by the 70 W bulb. When used for an extensive amount of time, the case can heat up to ~60 °C, so extensive contact with the housing should be avoided. Replacement bulbs are sold below.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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SLS303 Support Documentation
SLS303Stabilized Free-Space Light Source with Control Unit, 550 nm - 15 µm
$4,120.00
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Liquid Light Guide Adapter for Broadband Light Sources

Liquid Light Guide in Stabilized Lamp
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The SLSLLG2, with a liquid light guide, attached to the SLS402 Light Source.
  • Couples the Output of the Broadband Light Sources into a Liquid Light Guide
  • Adapters Designed for 185 nm - 2.1 µm or 350 - 700 nm Wavelength Range
  • Compatible with Ø3 mm and Ø5 mm Core Liquid Light Guides
  • SLSLLG2 Includes Integrated Electronic Shutter with External Controller

These Liquid Light Guide Adapters are designed to quickly and easily integrate with the Broadband Light Sources to couple the output into Ø3 mm or Ø5 mm core Liquid Light Guides (LLGs). The adapters contain a collimating lens and are externally SM2 threaded (2.035"-40), allowing them to directly thread onto the collimation lens assembly without the need to remove or adjust either lens.

The SLSLLG1 is designed with an uncoated collimating lens, which provides a wide operating range from 185 nm - 2.1 µm. For superior performance from 350 nm - 700 nm, the SLSLLG2 and SLSLLG3 lenses use an AR-coated lens that provides improved coupling efficiency in this wavelength range. Transmission of wavelengths longer than 800 nm through the LLG for longer than an hour may result in permanent damage to the LLG tip; to reduce damage during extended use, incorporate a filter to limit transmission of IR wavelengths. Please note that the SLS303 should not be used with our liquid light guides due to the MIR radiation.

The SLSLLG2 features an integrated diaphragm shutter and an external controller that can operate at continuous frequencies up to 10 Hz and burst frequencies up to 15 Hz. For more information on the integrated shutter, please refer to the manual.

All liquid light guide adapters come with the AD3LLG adapter preinstalled, making them compatible with Ø3 mm LLGs out of the box. They are also shipped with the Ø5 mm LLG-compatible AD5LLG adapter, which can be swapped in by unthreading the AD3LLG and replacing it with the AD5LLG.

Item # SLSLLG1 SLSLLG2 SLSLLG3
Wavelength Range Uncoated: 185 nm - 2.1 µm AR Coated: 350 nm - 700 nm; Ravg < 0.5%
Integrated Electronic Shutter No Yesa No
Lens LA4464 ACL5040U-A
Lens Material UV Fused Silica B270 Optical Crown Glass
Coupling Efficiencyb SLS401 / SLS402 >30% (3 mm LLG); >35% (5 mm LLG) >30% (3 mm LLG); >40% (5 mm LLG)
SLS301 >15% (3 mm LLG); >25% (5 mm LLG) >20% (3 mm LLG); >30% (5 mm LLG)
  • The external controller included with the SLSLLG2 is the same as the one included with the SHB1. For additional information, please see the full presentation here.
  • Please note that the SLS303 should not be used with our liquid light guides due to the MIR radiation.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
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SLSLLG1 Support Documentation
SLSLLG1Liquid Light Guide Adapter for Broadband Light Sources, 185 nm - 2.1 µm
$375.06
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SLSLLG2 Support Documentation
SLSLLG2Liquid Light Guide Adapter with Shutter for Broadband Light Sources, 350 nm - 700 nm
$1,343.72
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SLSLLG3 Support Documentation
SLSLLG3Liquid Light Guide Adapter for Broadband Light Sources, 350 nm - 700 nm
$226.93
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Replacement Light Bulbs

Item # SLS401B SLS402B SLS301B SLS303B
Compatible
Light Source(s)		 SLS401,
SLS402		 SLS401,
SLS402		 SLS301 SLS303
Bulb Type Xenon Arc Mercury-
Xenon Arc		 Quartz
Tungsten-
Halogen		 Silicon
Nitride
Globar
Electrical Power 150 W 70 W
Color Temperature
(Click for Spectrum)		 5800 K 6000 K 3400 K 1200 K
  • SLS401B: Replacement Xenon Bulb for SLS401 or SLS402 Short-Arc Light Sources
  • SLS402B: Replacement Mercury Xenon Bulb for SLS401 or SLS402 Short-Arc Light Sources
  • SLS301B: Replacement Quartz Tungsten-Halogen Bulb for SLS301 Stabilized Light Source
  • SLS303B: Replacement Globar for SLS303 Stabilized Light Source
  • Arc Lamp Bulbs are Ozone Free

These replacement light bulbs are for the SLS401 and SLS402 short-arc light sources, SLS301 quartz tungsten-halogen IR stabilized light source, and SLS303 globar IR stabilized light source. Our short-arc bulbs offer different output spectra and are cross-compatible with the SLS401 and SLS402 sources. Please see the Bulb Installation tab for detailed bulb replacement instructions.

The arc lamp bulbs are ozone free: they do not produce enough deep UV radiation to convert oxygen to ozone within the beam path, allowing the lamp to be safely used without the need for a system to purge the environment around the lamp of ozone.

Note: We strongly recommend wearing gloves when replacing the bulbs in our light sources to prevent skin oils from being deposited onto the bulbs. If you suspect the bulb is dirty, carefully clean it with alcohol before connecting it to a power supply.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SLS401B Support Documentation
SLS401BReplacement Xenon Short-Arc Bulb for SLS401 and SLS402 Light Sources
$386.62
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SLS402B Support Documentation
SLS402BReplacement Mercury-Xenon Short-Arc Bulb for SLS401 and SLS402 Light Sources
$386.62
Today
SLS301B Support Documentation
SLS301BReplacement Quartz Tungsten-Halogen Bulb for SLS301 Stabilized Light Source
$38.61
Today
SLS303B Support Documentation
SLS303BReplacement Silicon Nitride Globar Module for SLS303 Light Source
$309.00
Today
Additional Lamps
  • Stabilized Deuterium UV Light Source

  • Benchtop Light Sources

  • Plasma Light Sources

  • Compact Stabilized Broadband Light Sources

  • Fiber Optic Halogen Illuminator

  • Quartz Tungsten-Halogen Lamp

  • Tungsten Mid-IR Bulb

  • Liquid Light Guides

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