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Applied Optics

Applied Optics


  • Vol. 27, Iss. 13 — Jul. 1, 1988
  • pp: 2688–2693

Trace gas detection with short-external-cavity InGaAsP diode laser transmitter modules operating at 1.58 μm

Daniel T. Cassidy and Lee J. Bonnell  »View Author Affiliations

Applied Optics, Vol. 27, Issue 13, pp. 2688-2693 (1988)

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Detection of CO2 and CO at 1.58 μm (6322 cm−1) using an InGaAsP diode laser and mode control is described. Mode control is a technique whereby a short cavity, external to the laser, is used to force the laser to operate in a single mode. By monitoring the voltage across the terminals of the laser and using electronic feedback it is possible to optimize continually the external cavity so that the laser operates reliably in the mode of choice for scans >3.5 cm−1. This technique offers the possibility of high-sensitivity detection over a region of ~30 cm−1 with continuous coverage in overlapping sections of ~3 cm−1 with conventional (and hence inexpensive) multimode diode lasers.

© 1988 Optical Society of America

Original Manuscript: August 24, 1987
Published: July 1, 1988

Daniel T. Cassidy and Lee J. Bonnell, "Trace gas detection with short-external-cavity InGaAsP diode laser transmitter modules operating at 1.58 μm," Appl. Opt. 27, 2688-2693 (1988)

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