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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 14 — May. 10, 2009
  • pp: 2752–2759

Échelle spectrograph calibration with a frequency comb based on a harmonically mode-locked fiber laser: a proposal

J. J. McFerran  »View Author Affiliations


Applied Optics, Vol. 48, Issue 14, pp. 2752-2759 (2009)
http://dx.doi.org/10.1364/AO.48.002752


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Abstract

Details for constructing an astronomical frequency comb suitable as a wavelength reference for échelle spectrographs associated with optical telescopes are outlined. The source laser for the frequency comb is a harmonically mode-locked fiber laser with a central wavelength of 1.56 μm . The means of producing a repetition rate greater than 7 GHz and a peak optical power of 8 kW are discussed. Conversion of the oscillator light into the visible can occur through a two-step process of (i) nonlinear conversion in periodically poled lithium niobate and (ii) spectral broadening in photonic crystal fiber. While not necessarily octave spanning in spectral range to permit the use of an f -to- 2 f interferometer for offset frequency control, the frequency comb can be granted accuracy by linking the mode spacing and a comb tooth to separate frequency references. The design avoids the use of a Fabry–Perot cavity to increase the mode spacing of the frequency comb; however, the level of supermode suppression and sideband asymmetry in the fiber oscillator and in the subsequent frequency conversion stages are aspects that need to be experimentally tested.

© 2009 Optical Society of America

OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4050) Lasers and laser optics : Mode-locked lasers
(230.0250) Optical devices : Optoelectronics

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: February 17, 2009
Revised Manuscript: April 14, 2009
Manuscript Accepted: April 17, 2009
Published: May 7, 2009

Citation
J. J. McFerran, "Échelle spectrograph calibration with a frequency comb based on a harmonically mode-locked fiber laser: a proposal," Appl. Opt. 48, 2752-2759 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-14-2752

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