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Optics Letters

Optics Letters


  • Vol. 24, Iss. 2 — Jan. 15, 1999
  • pp: 110–112

Compact gas sensor using a pulsed difference-frequency laser spectrometer

Michael Seiter and Markus W. Sigrist  »View Author Affiliations

Optics Letters, Vol. 24, Issue 2, pp. 110-112 (1999)

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We present a novel compact pulsed laser spectrometer based on difference-frequency mixing of a cw tunable external-cavity diode laser (795–825 nm) and a pulsed Nd:YAG laser (1064 nm) in bulk LiNbO3 . The pulsed mid-IR source is continuously tunable from 3.16 to 3.67µm and exhibits a linewidth of only 154 MHz, a peak power of ≈50µW , and a pulse duration of 6 ns at a 6.5-kHz repetition rate. Spectra of methane in room air and formaldehyde have been recorded at room-temperature operation in a multipass cell with deduced detection limits of 10 and 40 parts in 109 , respectively.

© 1999 Optical Society of America

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(280.3420) Remote sensing and sensors : Laser sensors
(300.6340) Spectroscopy : Spectroscopy, infrared

Michael Seiter and Markus W. Sigrist, "Compact gas sensor using a pulsed difference-frequency laser spectrometer," Opt. Lett. 24, 110-112 (1999)

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