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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 14, Iss. 8 — Aug. 1, 1997
  • pp: 1945–1950

Modulation spectroscopy with a semiconductor diode laser by injection-current modulation

Xiang Zhu and Daniel T. Cassidy  »View Author Affiliations


JOSA B, Vol. 14, Issue 8, pp. 1945-1950 (1997)
http://dx.doi.org/10.1364/JOSAB.14.001945


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Abstract

An analysis of the harmonic content in frequency-modulation and wavelength-modulation spectroscopy with a semiconductor diode laser under injection-current modulation is presented. It is argued that it is the optical power rather than the electric field that is directly modulated by the injection current. A description that is valid for both frequency-modulation and wavelength-modulation spectroscopy based on this concept is developed, and special attention is given to the residual amplitude modulation and second-harmonic (2 f) detection. Data obtained by measuring the magnitudes of the first and second harmonic of the modulation frequency of the output of a 1.31-µm distributed-feedback diode laser under sinusoidal modulation of the current and the 2 f absorption spectrum of water vapor in wavelength-modulation spectroscopy are presented. These data support the concept that it is the optical power of a diode laser that is directly modulated by modulation of the injection current.

© 1997 Optical Society of America

Citation
Xiang Zhu and Daniel T. Cassidy, "Modulation spectroscopy with a semiconductor diode laser by injection-current modulation," J. Opt. Soc. Am. B 14, 1945-1950 (1997)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-14-8-1945

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