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Applied Optics

Applied Optics


  • Vol. 29, Iss. 33 — Nov. 20, 1990
  • pp: 5007–5013

Operating characteristics of a tunable diode laser absorption spectrometer using short-external-cavity and DFB laser diodes

Brian F. Ventrudo and Daniel T. Cassidy  »View Author Affiliations

Applied Optics, Vol. 29, Issue 33, pp. 5007-5013 (1990)

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Second harmonic detection at audio frequencies of isolated absorption lines with a laser absorption spectrometer employing AlGaAs and InGaAsP diode lasers, short external cavity (SXC) AlGaAs and InGaAsP diode lasers, and InGaAsP distributed feedback (DFB) diode lasers was investigated and compared. Noise levels equivalent to line center absorptions of ~3 × 10−6 were achieved with each source. Single mode tuning ranges of 20–50 cm−1 were obtained with both the SXC and DFB sources. The contamination of absorption spectra by suppressed laser side modes was identified and investigated as it relates to the identification of weak lines in the presence of strong lines.

© 1990 Optical Society of America

Original Manuscript: March 15, 1990
Published: November 20, 1990

Brian F. Ventrudo and Daniel T. Cassidy, "Operating characteristics of a tunable diode laser absorption spectrometer using short-external-cavity and DFB laser diodes," Appl. Opt. 29, 5007-5013 (1990)

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  1. H. Sasada, “Stark Modulation Spectroscopy of NH3 with a 1.23-μm Semiconductor Laser,” Opt. Lett. 9, 448–450 (1984). [CrossRef] [PubMed]
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  7. L. J. Bonnell, D. T. Cassidy, “Alignment Tolerances of Short-External-Cavity InGaAsP Diode Lasers For Use as Tunable Single-Mode Sources,” Appl. Opt. 28, 4622–4628 (1989). [CrossRef] [PubMed]
  8. D. M. Bruce, D. T. Cassidy, “Detection of Oxygen Using Short External Cavity GaAs Semiconductor Diode Lasers,” Appl. Opt. 29, 1327–1332 (1990). [CrossRef] [PubMed]
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  21. D. T. Cassidy, “Influence on the Steady-State Oscillation Spectrum of a Diode Laser for Light Interacting Coherently and Incoherently with the Field Established in the Laser Cavity,” Appl. Opt. 23, 2070–2077 (1984). [CrossRef] [PubMed]
  22. Harmonic detection can be performed if, instead of the laser wavelength, some property is modulated that influences the wavelength of absorption of a particular molecular species. Stark modulation of neutral molecules or velocity modulation of molecular ions are examples of such techniques. If the laser wavelength is not modulated, the weak fringes caused by accidental etalons (of finesse ≈ 10−4) in the optical path should not be observed. In such cases, the laser beam noise will limit the sensitivity of the TDLAS.
  23. The modulation required for atmospheric pressure detection will sweep over a greater number of fringes than the modulation required for low pressure detection. The maximum fringe signal should reduce as the modulation depth is increased. However, the difference in the modulation noise between detection of atmospheric pressure absorptions with AlGaAs lasers and detection of low pressure absorptions with InGaAsP lasers is greater than predicted theoretically. See Ref. 20.
  24. H. Sasada, Keio U., Japan; private communication.

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