Optical Frequency Comb as a general-purpose and wide-band calibration source for astronomical high resolution infrared spectrographs |
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Authors: | Giulia Schettino Ernesto Oliva Massimo Inguscio Carlo Baffa Elisabetta Giani Andrea Tozzi Pablo Cancio Pastor |
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Institution: | 1. Dipartimento di Fisica e Astronomia, Via Sansone 1, 50019, Sesto Fiorentino (Fi), Italy 2. INAF-Oss. Astrofisico di Arcetri, Largo E. Fermi 5, 50125, Firenze, Italy 3. LENS, Via Carrara 1, 50019, Sesto Fiorentino (Fi), Italy 4. INO-CNR, Largo E. Fermi 6, Firenze, 50125, Italy
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Abstract: | A spectrally filtered Optical Frequency Comb (OFC) laser is proposed as a versatile calibration source for astronomical spectrometers in the 1?C2 ??m 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 ????/???>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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