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Applied Optics

Applied Optics


  • Vol. 29, Iss. 15 — May. 20, 1990
  • pp: 2282–2288

Electrooptic modulation methods for high sensitivity tunable diode laser spectroscopy

David A. Glenar, Donald E. Jennings, and Shacher Nadler  »View Author Affiliations

Applied Optics, Vol. 29, Issue 15, pp. 2282-2288 (1990)

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A CdTe phase modulator and low power rf source have been used with Pb-salt tunable diode lasers operating near 8 μm to generate optical sidebands for high sensitivity absorption spectroscopy. Sweep averaged, first-derivative sample spectra of CH4 were acquired by wideband phase sensitive detection of the electrooptically (EO) generated carrier-sideband beat signal. EO generated beat signals were also used to frequency lock the TDL to spectral lines. This eliminates low frequency diode jitter, and avoids the excess laser linewidth broadening that accompanies TDL current modulation frequency locking methods.

© 1990 Optical Society of America

Original Manuscript: January 13, 1989
Published: May 20, 1990

David A. Glenar, Donald E. Jennings, and Shacher Nadler, "Electrooptic modulation methods for high sensitivity tunable diode laser spectroscopy," Appl. Opt. 29, 2282-2288 (1990)

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