High Frequency Modulation Spectroscopy with a Lead Salt Diode Laser

  • M. Gehrtz
  • W. Lenth
  • A. T. Young
  • H. S. Johnston
Conference paper
Part of the Air Pollution Research Reports book series (APRR)


Laser frequency modulation (FM) spectroscopy is a method of optical heterodyne spectroscopy capable of sensitive and rapid detection of absorption or dispersion features /1/. With this technique, quantum (shot noise) limited sensitivity can be readily achieved /2/, rendering FM spectroscopy a very useful tool e.g. for trace gas detection. A particularly attractive version of FM spectroscopy is high-frequency modulation spectroscopy with semiconductor lasers /3,4/: This scheme is implemented by modulating the injection current of the laser diode at radio frequencies, combining the simple and convenient tuning and modulation methods available for diode lasers with the high sensitivity and fast time response of optical heterodyne techniques. Recently, these features have been demonstrated /5/ with a GaAlAs laser diode emitting in the near infra-red.


Injection Current Shot Noise Fast Time Response Tunable Diode Laser Modulation Spectroscopy 
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  1. 1.
    G. C. Bjorklund, Opt. Lett. 5 (1980) 15CrossRefGoogle Scholar
  2. 2.
    for a recent review see: M. Gehrtz, G. C. Bjorklund, and E. A. Whittaker, J. Opt. Soc. Am. B 2 (1985) 1510Google Scholar
  3. 3.
    W. Lenth, Opt. Lett. 8 (1983) 575CrossRefGoogle Scholar
  4. 4.
    W. Lenth, IEEE J. Quantum Electron. QE-20 (1984) 1045Google Scholar
  5. 5.
    W. Lenth, and M. Gehrtz, Appl. Phys. Lett. 47 (1985) 1263CrossRefGoogle Scholar
  6. 6.
    M. Gehrtz, W. Lenth, A. T. Young, and H. S. Johnston, Opt. Lett. 11 (1986) 132CrossRefGoogle Scholar

Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1987

Authors and Affiliations

  • M. Gehrtz
    • 1
  • W. Lenth
    • 1
  • A. T. Young
    • 2
  • H. S. Johnston
    • 2
  1. 1.IBM Almaden Research CenterSan JoseUSA
  2. 2.Lawrence Berkeley LaboratoryUniversity of CaliforniaBerkeleyUSA

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