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Applied Optics

Applied Optics


  • Vol. 39, Iss. 27 — Sep. 20, 2000
  • pp: 5006–5011

High-sensitivity laser absorption measurements of broadband absorbers in the near-infrared spectral region

Kevin L. McNesby, Richard T. Wainner, Robert G. Daniel, Andrzej W. Miziolek, William M. Jackson, and Ian A. McLaren  »View Author Affiliations

Applied Optics, Vol. 39, Issue 27, pp. 5006-5011 (2000)

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We describe the development and characterization of a near-infrared diode-laser-based sensor to measure the vapor from trace gases having unstructured absorption spectra. The technique uses two equal amplitude-modulated laser beams, with the modulation of the two lasers differing in phase by 180 deg. One of the laser beams is at a wavelength absorbed by the gas [for these experiments, vapor is from pyridine (C5H5N)], and the second laser beam is at a wavelength at which no absorption occurs. The two laser beams are launched onto near-coincident paths by graded-index lens-tipped optical fibers. The mixed laser beam signal is detected by use of a single photodiode and is demodulated with standard phase-sensitive detection. Data are presented for the detection and measurement of vapor from pyridine (C5H5N) by use of the mixed laser technique. The discussion focuses on experimental determination of whether a compound exhibits unstructured absorption spectra (referred to here as a broadband absorber) and methods used to maximize sensitivity.

© 2000 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.1880) Instrumentation, measurement, and metrology : Detection
(140.2020) Lasers and laser optics : Diode lasers
(280.0280) Remote sensing and sensors : Remote sensing and sensors

Original Manuscript: February 24, 2000
Revised Manuscript: June 16, 2000
Published: September 20, 2000

Kevin L. McNesby, Richard T. Wainner, Robert G. Daniel, Andrzej W. Miziolek, William M. Jackson, and Ian A. McLaren, "High-sensitivity laser absorption measurements of broadband absorbers in the near-infrared spectral region," Appl. Opt. 39, 5006-5011 (2000)

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