Cryogenic measurement of the optical absorption coefficient in sapphire crystals at 1.064(micro)m for the Large-scale Cryogenic Gravitational wave Telescope
Takayuki Tomaru, Takashi Uchiyama, Daisuke Tatsumi, Shinji Miyoki, Masatake Ohashi, Kazuaki Kuroda, Toshikazu Suzuki, Akira Yamamoto, Takakazu Shintomi
Abstract
We have applied laser calorimetry to the measurement of optical absorption in mono-crystalline sapphire at cryogenic temperatures. Sapphire is a promising candidate for the mirror substrates of the Large-scale Cryogenic Gravitational wave Telescope. The optical absorption coefficients of different sapphire samples at a wavelength of 1.064(micro)m at 5K were found to average 90ppm/cm.
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