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Stabilized Deuterium UV Light Source![]()
SLS204 Deuterium Light Source Application Idea SLS204 Shown with Included M114L01 Solarization-Resistant Patch Cable SLS254B Replacement Deuterium Bulb (Not to Scale) Related Items ![]() Please Wait ![]() Click to Enlarge The fiber adapter and dust cap on the output port can be removed to use 30 mm cage system components and SM1-threaded components with the SLS204. ![]() Click to Enlarge The measured spectral power distribution for the SLS204 Light Source. The blue-shaded region indicates the lamp's operating wavelength range. Click here for raw data. Features
Thorlabs' SLS204 Deuterium Light Source provides stable illumination from 200 nm to 700 nm. The strong continuous spectrum at short UV wavelengths (200 - 400 nm) makes this an ideal source for UV spectroscopy applications. A closed-loop feedback system stabilizes the 30 W bulb which is coupled into a SMA905 bulkhead for connecting to a fiber patch cable. A low-noise fan cools the light source and bulb enabling continuous operation for >50 hours (see the Graphs tab for lamp stability over time). Each SLS204 includes a location-specific power cord. The SLS204 includes a M114L01 Solarization-Resistant Multimode Fiber Patch Cable. The light source has a typical fiber-coupled output power of 0.1 mW using the included patch cable and a typical 2 mW output power when used in a free-space configuration. Within the light source housing is a deuterium bulb and a series of UV fused silica lenses to focus the emitted light on the fiber port. Within the bulb, an electric arc is generated that excites the gaseous deuterium causing molecular emission of a continuous UV spectrum. In addition, two other major spectrum peaks occur at 486 nm and 656 nm. The deuterium bulb in the SLS204 has a lifetime of 2000 hours. Replacement bulbs are available for purchase separately. Please see the Bulb Replacement tab for detailed instructions on how to replace the bulb in these lamps. The SLS204 comes equipped with an SMA905 fiber adapter on the output aperture and a hinged dust cap. The adapter can be removed to expose internal SM1 (1.035"-40) threading that is compatible with other externally SM1-threaded fiber adapters. The dust cap can also be removed using the included 5/64" hex key or balldriver in order to access the two of the four 4-40 tapped holes for 30 mm cage rods that 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 seen in the image above). Please note that the SLS204 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.
![]() Click to Enlarge SLS204 Front Panel ![]() Click to Enlarge SLS204 Back Panel
![]() Click to Enlarge The measured spectral power distribution for the SLS204 Light Source. The blue-shaded region indicates the lamp's operating wavelength range. The continuous spectrum of the deuterium lamp extends from 200 nm - 400 nm. Please note that the lower apparent intensity of the output is due to detection limitations from 300 to 400 nm and <225 nm. ![]() Click to Enlarge The output of the SLS204 over 50 hours of continuous operation. This graph does not include 45 minutes of warm-up to ignite the source and stabilize the output. ![]() Click to Enlarge The bulb can be held by the metal casing with gloved hands. Avoid making contact with the bulb envelope directly. Bulb HandlingThe bulbs used in a deuterium 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.
![]() Click to Enlarge Step 3: Press Clamps and Pull Connector ![]() Click to Enlarge Step 2: Remove the Bulb Cover ![]() Click to Enlarge Step 1: Loosen Panel Screw ![]() Click for Details Step 6: Replace with New Bulb ![]() Click to Enlarge Step 5: Remove Bulb from Holder ![]() Click to Enlarge Step 4: Unscrew Bulb Bulb InstallationThe instructions and photos to the right detail the recommended procedure for replacing the bulbs in the SLS204 Deuterium Light Source. Do not attempt to change the light bulb while the bulb and unit are hot. Allow at least 10 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
Remove the Old Bulb
Install the New Bulb
Below is a selection guide for all of our white-light, broadband illumination sources (or lamps). In addition to these sources, Thorlabs also offers an unmounted white-light LED, five white-light mounted LEDs, two white-light fiber-coupled LEDs, and three high-powered, white-light Solis™ LEDs.
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