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Below is a selection guide for all of our white-light, broadband, lamp-based light sources. 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.

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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.

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.

The 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.

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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).

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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.

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.

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 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.