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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 5 — Feb. 10, 2009
  • pp: 818–826

Fast mode-hop-free acousto-optically tuned laser: theoretical and experimental investigations

André Bösel and Klaus-Dieter Salewski  »View Author Affiliations

Applied Optics, Vol. 48, Issue 5, pp. 818-826 (2009)

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We developed a theory that describes fast mode-hop-free tuning of an external cavity diode laser in Littrow configuration with two acousto-optic modulators (AOMs) inside the laser cavity. The theory is based on synchronous shifting of the external cavity modes and the Littrow grating selectivity. It allows calculating the driving signals of both AOMs in order to reach a desired temporal variation of the laser frequency, including particularly fast tuning as well as an arbitrary shape of the tuning function. Furthermore, we present a laser setup for which the needed signals for both AOMs are generated by two direct digital synthesizer circuits. Thereby we were able to verify the theoretical predictions experimentally, achieving, e.g., sinusoidal single-mode tuning of the laser frequency over 40 GHz at a repetition rate of 10 kHz and over 12 GHz at 25 kHz . Finally, the limitations of the theory are discussed.

© 2009 Optical Society of America

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(140.3570) Lasers and laser optics : Lasers, single-mode
(140.3600) Lasers and laser optics : Lasers, tunable
(140.7300) Lasers and laser optics : Visible lasers
(230.1040) Optical devices : Acousto-optical devices

ToC Category:
Lasers and Laser Optics

Original Manuscript: July 29, 2008
Revised Manuscript: December 11, 2008
Manuscript Accepted: January 8, 2009
Published: February 2, 2009

André Bösel and Klaus-Dieter Salewski, "Fast mode-hop-free acousto-optically tuned laser: theoretical and experimental investigations," Appl. Opt. 48, 818-826 (2009)

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