We are developing a diagnostic system using short-wavelength far-infrared lasers (40-70 /spl mu/m in wavelength) 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 multi-channel interferometer. Using our FIR laser system, the optical constants (refractive index n, absorption coefficient /spl alpha/ and transmissivity T) of the diamond etalon have been measured precisely for 47-, 57- and 71-/spl mu/m in wavelength. The result for 57.1511 /spl mu/m light is n=2.383(0)/spl plusmn/0.001, /spl alpha/=0.32/spl plusmn/0.02 cm/sup -1/ and T=96/spl plusmn/1% (at 1.023 mm in thickness).


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    Title :

    Measurement of optical constants of CVD-diamond for short-wavelength far-infrared region


    Contributors:
    Nakayama, K. (author) / Tazawa, H. (author) / Okajima, S. (author) / Kawahata, K. (author) / Tanaka, K. (author) / Tokuzawa, T. (author) / Ito, Y. (author)


    Publication date :

    2002-01-01


    Size :

    132396 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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