Experimental Astronomy

, Volume 31, Issue 1, pp 69–81 | Cite as

Optical Frequency Comb as a general-purpose and wide-band calibration source for astronomical high resolution infrared spectrographs

  • Giulia Schettino
  • Ernesto Oliva
  • Massimo Inguscio
  • Carlo Baffa
  • Elisabetta Giani
  • Andrea Tozzi
  • Pablo Cancio Pastor
Original Article

Abstract

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.

Keywords

Optical Frequency Combs (OFCs) Near-IR astronomical spectrographs 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Giulia Schettino
    • 1
    • 2
  • Ernesto Oliva
    • 2
  • Massimo Inguscio
    • 1
    • 3
    • 4
  • Carlo Baffa
    • 2
  • Elisabetta Giani
    • 2
  • Andrea Tozzi
    • 2
  • Pablo Cancio Pastor
    • 3
    • 4
  1. 1.Dipartimento di Fisica e AstronomiaSesto Fiorentino (Fi)Italy
  2. 2.INAF-Oss. Astrofisico di ArcetriFirenzeItaly
  3. 3.LENSSesto Fiorentino (Fi)Italy
  4. 4.INO-CNRFirenzeItaly

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