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Fiber-Coupled Xenon Light Source

  • 75 W Xenon Short-Arc Bulb with 240 - 1200 nm Output
  • Long 2000 Hour Lifespan
  • SMA905 Fiber-Coupled Output
  • Compatible with SM1 Components and 30 mm Cage Systems


Xenon Light Source


Replacement Xenon Bulb (Not to Scale)

Application Idea

The SLS205 Light Source in a Free-Space Configuration with 30 mm Cage System Components and SM1-Threaded Components

Related Items

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Xenon lamp fiber-coupled
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The SLS205 fiber-coupled light source shown with the included M111L01 solarization-resistant patch cable.
deuterium lamp front
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Click for Raw Data
The measured spectral power distribution for the SLS205 light source. The spectrum is plotted on a log scale so that both the underlying shape and spectral lines are visible.


  • Xenon Short Arc Light Source for 240 - 1200 nm
  • 75 W Xenon Bulb with a 1.3 mm Arc Gap
  • Removable SMA905 Fiber Adapter
  • Internally SM1-Threaded (1.035"-40) Aperture
  • BNC Port for External CMOS Shutter Control
  • 0.12% Per Hour and 0.1% Per °C Output Power Drift
  • Compatible with 30 mm Cage System and Ø1" Lens Tubes
  • Replacement Xenon Bulb Available Separately
  • Location-Specific Power Cord Included

Thorlabs' SLS205 Fiber-Coupled Xenon Light Source provides illumination from 240 nm to 1200 nm with intense lines between 800 nm and 1000 nm. The strong continuous spectrum at UV and visible wavelengths (200 - 700 nm) makes this an ideal source for UV and visible spectroscopy applications. This light source also emits at wavelengths out to 1200 nm, allowing for use with near-infrared-light applications. A constant power supply stabilizes the 75 W bulb, which has a short arc gap of 1.3 mm to support high coupling efficiency when used with the included patch cable. The shutter in the SLS205 light source can be controlled manually via the switch on the front panel or externally via a 0 to 5 V CMOS BNC port on the back panel. A fan cools the light source and bulb, enabling continuous operation for >30 hours (see the Graphs tab for lamp stability).

The SLS205 light source comes equipped with an SMA905 fiber adapter on the output aperture and ships with a M111L01 SMA to SMA Solarization-Resistant Multimode Fiber Patch Cable. The fiber adapter can be removed so the lamp functions as a free-space source. The typical fiber-coupled output power is 5.5 mW using the included patch cable and 290 mW when used in a free-space configuration. Removing the adapter exposes internal SM1 (1.035"-40) threading that is compatible with other externally SM1-threaded fiber adapters. Four 4-40 tapped holes on the front panel are designed for 30 mm cage rods to provide compatibility with 30 mm cage system components. Using the cage system, it is possible to incorporate various optic mounts that are centered along the optical center of the lamp (as pictured in the image to the upper right).

Within the light source housing is a xenon bulb and a series of lenses to focus the emitted light into the fiber port. A mirror placed behind the bulb helps to increase the coupling efficiency. Within the bulb, an electric arc is generated that excites the gaseous xenon, causing emission of a broadband spectrum that ranges from UV into near-infrared wavelengths. The xenon bulb in the SLS205 light source has a lifetime of 2000 hours. A status LED on the front panel indicates when the unit is functioning normally or if an issue occurs, such as overheating or the bulb nearing the end of its lifetime. Additionally, the bulb power can be monitored via a BNC port on the back panel that provides a voltage feedback signal from a photodiode inside the housing. Replacement bulbs can be purchased separately below. Please see the Bulb Installation tab for detailed instructions on how to install and replace the bulb in these lamps.

Please note that the SLS205 light source generates high-intensity UV light. Wear appropriate eye protection and do not look directly at the output during operation. Do not place hands or body parts in the path of the beam.

Item # SLS205
Wavelength Range 240 - 1200 nm
Bulb Electrical Power 75 W
Included Output Fiber M111L01 Patch Cable
Ø105 µm, 0.22 NA, SMA905 Connectors
Fiber-Coupled Output Powera 5.5 mW (Typical)
Free-Space Output Powerb 290 mW (Typical)
Fiber-Coupled Color Temperaturea 5400 K (Typical)
Free-Space Color Temperatureb 5800 K (Typical)
Output Power Drift 0.12% Per Hour (Typical)
0.1% Per °C (Typical)
Output Power Stabilityc <0.5%
Bulb Lifetimed 2000 h
Bulb Arc Gap 1.3 mm
Shutter Switch Time 5 ms
Shutter Repetition Rate (Max) 10 Hz (Burst)
Bulb Power Monitor 0 - 5 V Analog
External Shutter Control 0 - 5 V CMOS
High: 3.8 - 5 V, Low: 0 - 1.5 V
Power Supply 100 - 240 VAC, 50 - 60 Hz
Operating Temperature 0 - 45 °C
Storage Temperature -15 - 70 °C
Dimensions (L x W x H) 325.6 mm x 162.5 mm x 162.8 mm
(12.82" x 6.40" x 6.41")
  • Measured with M111L01 Fiber Patch Cable at Beginning of Bulb Lifetime
  • Measured at the Output Port with the Fiber Adapter Removed at Beginning of Bulb Lifetime
  • Standard deviation of optical power measured at room temperature over a 1 hour period (after 45 minutes of warm-up) with a 1 Hz sampling rate.
  • Defined as the time it takes for the bulb to decrease to ≤50% of the initial output intensity.
SLS205 Front Panel
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SLS205 Xenon Light Source Front Panel
SLS205 Front Panel
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SLS205 Xenon Light Source Back Panel
Patch Cable Item # M111L01
Wavelength Range 180 - 1200 nm
NA 0.22
Core Diameter 105 ± 2.1 µm
Cladding Diameter 125 ± 1 µm
Coating Diameter 250 ± 10 µm
Bend Radius (Short Term) 15 mm
Bend Radius (Long Term) 30 mm
Length 1 m
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Click for Raw Data
The measured spectral power distribution for the SLS205 lamp.
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Click for Raw Data
The output of the SLS205 lamp over 30 hours of continuous operation. This graph does not include 45 minutes of warm-up to ignite the source and stabilize the output.
Bulb Handling
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The bulb should be held by the handle with gloved hands. Avoid making contact with the bulb envelope directly.

Bulb Handling

The bulbs used in a xenon lamp 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.

  • 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.
  • Never bump, drop, apply excessive stress to, 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.
  • Always wear gloves when handling the bulb; never hold the bulb by its envelope (see photo to the right). Thorlabs offers gloves that can be used for bulb handling.
  • The bulb generates very high-intensity UV light output; wear the appropriate laser safety glasses during operation.
  • 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.


Bulb Installation

The bulb must be installed in the SLS205 Xenon Light Source before operation. The instructions and photos below detail the recommended procedure for installing the bulb. 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.

Open the Lamp Housing

  1. Use the included 2 mm (5/64") hex key to loosen the panel screw on the side of the light source.
  2. Grip the bulb cover and pull to remove it.

Transfer the Bulb to the Housing

  1. Carefully remove the bulb from its original package. Always hold the module at its handle. Avoid holding the glass envelope.
  2. Remove the protective shipping supports using the included 2.5 mm hex key. Also remove the silicone cushion on the bulb anode.
  3. Slide the bulb module into the optics base. The magnet on the handle will lock the position of module.

Secure the Bulb in Place

  1. Remove the heat sink from the internal side of the front panel and mount it on the anode.
  2. Ensure the anode heat sink is securely in place. While holding the heat sink, tighten the black thumbscrew by hand, turning it clockwise. Replace the side panel and tighten the panel screw with the hex key.

For instructions on removing and replacing the bulb, please refer to steps listed in the manual, which can be accessed by clicking on the red docs icon () below.

SLS205 Bulb Installation
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Step 1: Loosen Panel Screw
SLS205 Bulb Installation
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Step 2: Remove Bulb Cover
SLS205 Bulb Installation
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Step 3: Remove Bulb from Packaging
SLS205 Bulb Installation
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Step 4: Remove Shipping Supports
SLS205 Bulb Installation
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Step 5: Slide Bulb into Optics Base
SLS205 Bulb Installation
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Step 6: Place Heat Sink on Bulb Anode
SLS205 Bulb Installation
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Step 7: Tighten Thumbscrew

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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
Not to Scale)
Emitter Type Wavelength
(Click for Plot)
Output Coupling Output Power Bulb
SLS204 Deuterium 200 - 700 nm Free Space or
Fiber Coupled (SMA)
2 mWa
0.1 mWb
30 W N/A 2000 hc SLS254B
SLS205 Xenon Arc 240 - 1200 nm Free Space or
Fiber Coupled (SMA)
290 mWa
5.5 mWd
75 W 5800 Ka
5400 Kd
2000 hc SLS255B
SLS401 Xenon Arc 240 - 2400 nm Free Spacee >1.3 Wa 150 W 5800 K 2000 hc SLS401B
SLS402 Mercury-Xenon Arc 240 - 2400 nm Free Spacee >1.3 Wa 150 W 6000 K 2000 hc SLS402B
SLS201L(/M) Quartz
360 - 2600 nm Free Spacee or
Fiber Coupled (SMA)
500 mWa
10 mWf
9 W 2796 K 10 000 h SLS251
SLS301 360 - 3800 nm Free Spacee >1.6 Wa 150 W 3400 K 1000 hg SLS301B
OSL2 Typical
Fiber Bundle 1.4 Wh 150 W 3200 K 1000 to
10 000 hc
QTH10(/M) 400 - 2200 nm Free Space 50 mW (Typ.) 10 W 2800 Ki (Typ.) 2000 h QTH10B
SLS202L(/M) Tungsten 450 nm - 5.5 µm Free Spacee or
Fiber Coupled (SMA)
700 mWa
2 mWj
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 hg 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.
  • Operation time before the maximum optical output power of the bulb reaches 50% of its original output.
  • Measured with Thorlabs' M111L01 solarization-resistant patch cable at beginning of bulb lifetime.
  • Adapters are available separately to couple the free-space output into liquid light guides (LLGs).
  • Fiber-coupled optical power, measured with included M28L01 fiber patch cable at beginning of bulb lifetime.
  • 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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SLS205 Support Documentation
SLS205Fiber-Coupled Xenon Light Source, 240 - 1200 nm
SLS255B Support Documentation
SLS255BReplacement Xenon Bulb for the SLS205
5-8 Days
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