LIGO Document G1400385-v3

Cryogenic behavior of LEDs for use in third generation LIGO position sensors and actuators

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G - Presentations (eg Graphics)
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The sensitivity of Advanced LIGO, the second-generation among ground-based, long-baseline interferometric gravitational-wave detectors, is expected to be limited by thermal noise of test-mass optical coatings within the frequency band of interest. To reduce the effects of thermal noise, and thereby increase the sensitivity of LIGO interferometers, the third generation of LIGO detectors will likely be operated with some optical and control components at cryogenic temperatures. In the interest of developing and investigating LIGO subsystems at low temperatures, the University of Florida LIGO Group has constructed a testbed for table-top cryogenic experiments. This presentation focuses on a preliminary investigation into cryogenic Birmingham Optical Sensors and Electro-Magnetic actuators (BOSEMS). BOSEMS are shadow sensors which are used to sense the position of and actuate on the LIGO core optics. Specifically, the low temperature I-V performance and efficiency of LEDs used in BOSEMs will be presented.
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cryogenic BOSEM LED

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