Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011exa....31...69s&link_type=abstract
Experimental Astronomy, Volume 31, Issue 1, pp.69-81
Astronomy and Astrophysics
Astronomy
1
Optical Frequency Combs (Ofcs), Near-Ir Astronomical Spectrographs
Scientific paper
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.
Baffa Carlo
Giani Elisabetta
Inguscio Massimo
Oliva Ernesto
Pastor Pablo Cancio
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