A. Nishizawa, J. Fujita, M. Yamanaka, S. Okajima, S. Makino, M. Kondo, S. Nakata, S. Kon, A. Nagashima, Y. Tsunawaki
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Crystal Quartz Etalons for FIR Laser Interferometer
Crystal quartz etalons are designed for the beam splitter and the window of a 118.8-μm CH3OH laser interferometer. Measured transmissivities of these etalons agree with estimated values within ± 2%. The measured refractive index and absorption coefficient derived from the transmissivity measurements for the extraordinary ray at 118.834 μm are 2.1695 ± 0.0004 and 0.50 ± 0.09 cm−1, respectively.
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