Abstract
Low-absorption optics made of OH-reduced fused silica are a key technology for future gravitational wave detectors such as the Advanced LIGO. We developed a sensitive method to measure the absorption inside the beam splitter of the GEO 600, taking advantage of the effect of thermal lensing. Using this method, we derived a bulk absorption of less than for a piece of Suprasil 311 SV at a wavelength of . To the best of our knowledge, this is the lowest value of light absorption inside fused silica reported so far in the literature.
© 2006 Optical Society of America
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