Measurement of Optical Constants of CVD-Diamond for Short-Wavelength Far-Infrared Lasers |
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Authors: | K Nakayama H Tazawa S Okajima K Kawahata K Tanaka T Tokuzawa and Y Ito |
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Institution: | (1) College of Engineering, Chubu University, Kasugai-shi, Aichi, 487-8501, Japan;(2) National Institute for Fusion Science, Toki-shi, Gifu, 509-5292, Japan |
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Abstract: | A diagnostic system using short-wavelength far-infrared (FIR) lasers (40–70 m in wavelength) is now being developed for high density and large volume plasmas. In the wavelength region, a CVD-diamond is the excellent materials for optical windows of the laser and the plasma vessel and beam splitters of a multichannel interferometer. To design these optical elements, the optical constants (refractive index n, absorption coefficient and transmissivity T) of the CVD-diamond have been measured precisely by using FIR lasers of 48-, 57- and 71-m in wavelength. As an example, the result for 57.1511 m light is n = 2.383(1) ± 0.002, = 0.19 ± 0.05 cm-1 and T = 97.5 ± 1.5% at 1.023 mm in thickness. |
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Keywords: | far-infrared laser optical constants refractive index absorption coefficient |
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