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Applied Optics

Applied 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)

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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

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

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)

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  1. R. S. Eng, J. F. Butler, K. J. Linden, “Tunable Diode Laser Spectroscopy: An Invited Review,” Opt. Eng. 19, 945 (1980). [CrossRef]
  2. J. Reid, M. El-Sherbiny, B. K. Garside, E. A. Ballik, “Sensitivity Limits of a Tunable Diode Lasr Spectrometer, with Application to the Detection of NO2 at the 100-ppt Level,” Appl. Opt. 19, 3349 (1980). [CrossRef] [PubMed]
  3. G. C. Bjorklund, “Frequency-Modulation Spectroscopy: A New Method for Measuring Weak Absorptions and Dispersions,” Opt. Lett. 5, 15 (1980). [CrossRef] [PubMed]
  4. L. T. Molina, W. B. Grant, “FTIR-Spectrometer-Determined Absorption Coefficients of Seven Hydrazine Fuel Gases: Implications for Laser Remote Sensing,” Appl. Opt. 23, 3893 (1984). [CrossRef] [PubMed]
  5. F. S. Chen, “Modulators for Optical Communications,” Proc. IEEE 58, 1440 (1970). [CrossRef]
  6. G. M. Carter, “Tunable High Efficiency Microwave Frequency-Shifting of Infrared Lasers,” Appl. Phys. Lett. 32, 810 (1978). [CrossRef]
  7. P. K. Cheo, “Frequency Synthesized and Continuously Tunable IR Laser Sources in 9- to 11-μm,” IEEE J. Quantum Electron. QE-20, 700 (1984). [CrossRef]
  8. S. Y. Wang, D. M. Bloom, “100-GHz Bandwidth Planar GaAs Schottky Photodiode,” Electron. Lett. 19, 554 (1983). [CrossRef]
  9. D. L. Spears, “Theory and Status of High Performance Heterodyne Detectors,” Proc. Soc. Photo-Opt. Instrum. Eng. 300, 174 (1981).
  10. D. E. Cooper, T. F. Gallagher, “Double Frequency Modulation Spectroscopy: High Modulation Frequency with Low-Bandwidth Detectors,” to be published in 15 Mar. issue of Appl. Opt.
  11. N. H. Tran, R. Kachru, T. F. Gallagher, J. P. Watjen, G. C. Bjorklund, “Generation of Microwaves by Mixing Two Optical Frequencies in a Nonlinear Crystal: A Novel Approach to High-Bandwidth Optical Mixers,” Opt. Lett. 10, 128 (1984). [CrossRef]
  12. G. C. Bjorklund, M. D. Levenson, W. Lenth, C. Ortiz, “Frequency Modulation (FM) Spectroscopy, Theory of Lineshapes and Signal-to-Noise Analysis,” Appl. Phys. B 32, 145 (1983). [CrossRef]
  13. S. Namba, “Electro-Optical Effect of Zincblende,” J. Opt. Soc. Am. 51, 76 (1961). [CrossRef]
  14. R. H. Kingston, Detection of Optical and Infrared Radiation (Springer, New York, 1978).

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