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Free keywords:
Physics, Optics, physics.optics
Abstract:
Crystalline silicon is currently being discussed as test-mass material for
future generations of gravitational wave detectors that will operate at
cryogenic temperatures. We present optical absorption measurements on a
large-dimension sample of crystalline silicon at a wavelength of 1550nm at room
temperature. The absorption was measured in a monolithic cavity setup using the
photo-thermal self-phase modulation technique. The result for the absorption
coefficient of this float-zone sample with a specific resistivity of 11kOhm cm
was measured to be \alpha_A=(264 +/- 39)ppm/cm.