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Free-Space Broadband Light Sources![]()
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 ![]() Please Wait
![]() Click to Enlarge
The SLS301 using a 60 mm cage system to mount a color-balancing filter into an LCP05 Filter Mount.
Features
Optional Accessories
![]() 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.
Bulb Specifications
Liquid Light Guide Adapter Specifications
Xenon and Mercury-Xenon Arc Lamp Sources![]() 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. ![]() 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. ![]() 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![]() 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. ![]() Click to Enlarge Click for Raw Data The calculated spectral power distribution for the SLS301 Light Source. Stabilized Silicon Nitride Globar Source![]() 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. ![]() 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. ![]() Click to Enlarge The bulb can be held by its electrodes with gloved hands. Avoid making contact with the bulb envelope. Bulb HandlingThe 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.
Bulb InstallationThe 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 LampBulb HandlingThe 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.
Open the Lamp Housing
Remove the Old Bulb
Install the New Bulb
Stabilized Quartz Tungsten-Halogen LampOpen the Lamp Housing
Remove the Old Bulb
Install the New Bulb
Stabilized Silicon Nitride Globar LampPlease note that the Globar modules should only be handled with protective gloves. Open the Lamp Housing
Remove the Old Globar Module
Install the New Module
SLS401 and SLS402 Connector![]()
SLS301 and SLS303 Connectors![]()
Monitor Photodiode Out
SLS301: 0 to 4 V SLS303: 0 to 5 V SLSLLG2 Shutter Interface Connector![]() Female Jack on Controller ![]() Male Plug on 35" (889 mm) Long Shutter Cord
External Modulation Input: TTL 0 to 5 V, Female BNC Interlock Output: 2.5 mm Mono Phone Jack
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.
![]() ![]() 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. ![]() 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. ![]() Click to Enlarge The control unit for the SLS401 or SLS402. ![]() 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. ![]() Click to Enlarge These Short-Arc Sources include a concave mirror to focus light radiated behind the bulb back towards the front aperture.
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. ![]() ![]() Click to Enlarge Click for Raw Data The calculated spectral power distribution for the SLS301 Light Source. ![]() Click to Enlarge The control unit for the SLS301. ![]() Click to Enlarge The back port provides access to uncollimated light at longer wavelengths. ![]() Click to Enlarge The back of the SLS301 with the removable plate taken out to incorporate 30 mm cage rods and fixed optic holder.
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. ![]() ![]() 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. ![]() Click to Enlarge SLS303 75 W Controller ![]() Click to Enlarge The Globar module has an integrated aluminum reflector that focuses light radiated by the Globar towards the front aperture.
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. ![]() ![]() Click to Enlarge The SLSLLG2, with a liquid light guide, attached to the SLS402 Light Source.
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.
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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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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