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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 15 — May. 20, 2008
  • pp: 2806–2812

Wavelength- and amplitude-modulated photoacoustics: comparison of simulated and measured spectra of higher harmonics

M. Angelmahr, A. Miklós, and P. Hess  »View Author Affiliations


Applied Optics, Vol. 47, Issue 15, pp. 2806-2812 (2008)
http://dx.doi.org/10.1364/AO.47.002806


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Abstract

Photoacoustic (PA) spectra generated by current modulation of a distributed feedback diode laser (DFB-DL) were measured for the ammonia absorption line at 1.53 μm and calculated using absorption spectra taken from a database. The algorithm is based on a combined amplitude- and wavelength-modulation (AM–WM) scheme. The spectral characteristics of the DFB-DL were determined by comparing simulated spectra with Fourier transform infrared measurements. PA spectra were measured and simulated from the first to fourth harmonic and a variation of the modulation depth with modulation frequency was observed. It was found that combined AM–WM modulation may produce larger PA signals than separate AM or WM detection for the first harmonic.

© 2008 Optical Society of America

OCIS Codes
(140.5960) Lasers and laser optics : Semiconductor lasers
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6380) Spectroscopy : Spectroscopy, modulation
(110.5125) Imaging systems : Photoacoustics

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: January 18, 2008
Revised Manuscript: March 18, 2008
Manuscript Accepted: March 21, 2008
Published: May 14, 2008

Citation
M. Angelmahr, A. Miklós, and P. Hess, "Wavelength- and amplitude-modulated photoacoustics: comparison of simulated and measured spectra of higher harmonics," Appl. Opt. 47, 2806-2812 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-15-2806

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