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Crystalline silicon is currently being discussed as test-mass material forfuture generations of gravitational wave detectors that will operate atcryogenic temperatures. We present optical absorption measurements on alarge-dimension sample of crystalline silicon at a wavelength of 1550nm at roomtemperature. The absorption was measured in a monolithic cavity setup using thephoto-thermal self-phase modulation technique. The result for the absorptioncoefficient of this float-zone sample with a specific resistivity of 11kOhm cmwas measured to be \alpha_A=(264 +/- 39)ppm/cm.

Optical Absorption Measurements on Crystalline Silicon at 1550nm