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  • optical frequency comb as a general-purpose and wide-band calibration source for astronomical high resolution infrared spectrographs

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 918
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     a spectrally filtered optical frequency comb (ofc) laser is proposed as a versatile calibration source for astronomical spectrometers in the 1–2 μm spectral range. such a source overcomes the limitations of current calibration lamps providing a uniform spectrum of equally spaced lines with similar intensity and extremely high long-term frequency stability. we present preliminary studies and results of a system which filters the ofc from a 100 mhz comb spacing to 16 ghz one, an adequate spacing for spectrometers with resolving power δλ/λ >30000. the first approach employs two fabry-perot cavities in series, made of dielectric coated mirrors, followed by a non-linear optical broadening system. the limitations of such a filtering process are discussed. these can be overcome by the second approach, based on filtering cavities with metallic coated mirrors.

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