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Applied Optics

Applied Optics


  • Vol. 42, Iss. 12 — Apr. 20, 2003
  • pp: 2110–2118

Antireflection-coated blue GaN laser diodes in an external cavity and Doppler-free indium absorption spectroscopy

Lars Hildebrandt, Richard Knispel, Sandra Stry, Joachim R. Sacher, and Frank Schael  »View Author Affiliations

Applied Optics, Vol. 42, Issue 12, pp. 2110-2118 (2003)

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Commercially available GaN-based laser diodes were antireflection coated in our laboratory and operated in an external cavity in a Littrow configuration. A total tuning range of typically 4 nm and an optical output power of up to 30 mW were observed after optimization of the external cavity. The linewidth was measured with a heterodyne technique, and 0.8 MHz at a sweep time of 50 ms was obtained. The mode-hop-free tuning range was more than 50 GHz. We demonstrated the performance of the laser by detecting the saturated absorption spectrum of atomic indium at 410 nm, allowing observation of well-resolved Lamb dips.

© 2003 Optical Society of America

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(140.3600) Lasers and laser optics : Lasers, tunable
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers

Original Manuscript: May 20, 2002
Revised Manuscript: July 15, 2002
Published: April 20, 2003

Lars Hildebrandt, Richard Knispel, Sandra Stry, Joachim R. Sacher, and Frank Schael, "Antireflection-coated blue GaN laser diodes in an external cavity and Doppler-free indium absorption spectroscopy," Appl. Opt. 42, 2110-2118 (2003)

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