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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 24, Iss. 5 — Mar. 1, 1985
  • pp: 710–716

Frequency modulation spectroscopy with a CO2 laser: results and implications for ultrasensitive point monitoring of the atmosphere

David E. Cooper and T. F. Gallagher  »View Author Affiliations


Applied Optics, Vol. 24, Issue 5, pp. 710-716 (1985)
http://dx.doi.org/10.1364/AO.24.000710


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Abstract

In a demonstration of frequency modulation spectroscopy with a CO2 laser, sidebands at 1 GHz were generated using a CdTe electrooptic phase modulator driven either by 5-kW pulses from a microwave cavity oscilllator or by 10 W of cw power from a solid-state microwave amplifier. Frequency modulation signals resulting from sideband absorption by Fabry-Perot resonances were measured using a room-temperature 1-GHz bandwidth HgCdTe detector. Signal-to-noise ratios for the conditions of our experiments were ∼200:1 and limited by rf pickup noise in the detection electronics. Substantial improvements in SNR can be made by providing better rf shielding for the detection electronics and by using a liquid–nitrogen-cooled detector in conjunction with improved modulator designs.

© 1985 Optical Society of America

History
Original Manuscript: October 30, 1984
Published: March 1, 1985

Citation
David E. Cooper and T. F. Gallagher, "Frequency modulation spectroscopy with a CO2 laser: results and implications for ultrasensitive point monitoring of the atmosphere," Appl. Opt. 24, 710-716 (1985)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-24-5-710


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