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Applied Optics

Applied Optics


  • Vol. 42, Iss. 24 — Aug. 20, 2003
  • pp: 4819–4826

Modeling of the nonlinear response of the intrinsic HgCdTe photoconductor by a two-level rate equation with a finite number of carriers available for photoexcitation

René S. Hansen  »View Author Affiliations

Applied Optics, Vol. 42, Issue 24, pp. 4819-4826 (2003)

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A description of the nonlinear response of a HgCdTe photoconductor on the incident optical radiation is derived from a two-level rate equation for the photoexcited carriers. The model accounts for a limited number of electrons available for photoexcitation, and the possibility of photostimulated relaxation of an already excited photoelectron. The detector response as well as the level of incident optical power where saturation occurs is directly related to the physical constants of the detector material. The saturation of the detector is the same phenomenon as is known for the saturable absorbers—the detector material becomes transparent when the incident optical power exceeds the saturation power. Even though the description given here is applied to the HgCdTe detector, the general model can be applied to other detector materials as well. The parameters for the model are fitted to a thermoelectrically cooled HgCdTe detector and afterwards employed to predict the detector noise performance in a heterodyne setup. Unlike for liquid-nitrogen-cooled detectors, shot-noise-limited detection cannot be obtained with use of only thermoelectrical cooling (226 K) of the detector. However, the detector performance can be optimized to be able to perform Doppler measurements from aerosol backscatter by use of the model presented to optimize the applied optical power in the reference wave.

© 2003 Optical Society of America

OCIS Codes
(040.2840) Detectors : Heterodyne
(040.3060) Detectors : Infrared
(040.3780) Detectors : Low light level
(040.5150) Detectors : Photoconductivity
(040.5160) Detectors : Photodetectors
(280.3340) Remote sensing and sensors : Laser Doppler velocimetry

Original Manuscript: February 18, 2003
Revised Manuscript: May 7, 2003
Published: August 20, 2003

René S. Hansen, "Modeling of the nonlinear response of the intrinsic HgCdTe photoconductor by a two-level rate equation with a finite number of carriers available for photoexcitation," Appl. Opt. 42, 4819-4826 (2003)

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  1. J. F. Siliquini, L. Faraone, “The vertical photoconductor: a novel device structure suitable for HgCdTe two-dimensional infrared focal plane arrays,” Infrared Phys. Technol. 38, 205–221 (1997). [CrossRef]
  2. C. T. Elliott, N. T. Gordon, D. J. Wilson, C. L. Jones, C. D. Maxey, N. E. Metcalfe, A. Best, “A high-performance CO2 laser heterodyne detector operating at 250 K,” J. Mod. Opt. 45, 1601–1611 (1998).
  3. D. Oh, P. Drobinski, P. Salamitou, P. H. Flamant, “Optimal local oscillator power for CMT photo-voltaic detector in heterodyne mode,” Inf. Phys. Technol. 37, 325–333 (1996). [CrossRef]
  4. D. J. Wilson, G. D. J. Constant, R. Foord, J. M. Vaughan, “Detector performance studies for CO2 laser heterodyne systems,” Infrared Phys. 31, 109–115 (1991). [CrossRef]
  5. M. A. Kaiyan, H. F. Freeman, M. R. Hardesty, R. Lawrence, R. E. Cupp, “Heterodyne quantum efficiency of a HgCdTe infrared Doppler detector,” Appl. Opt. 28, 1750–1751 (1989).
  6. R. S. Hansen, S. Frandsen, L. Kristensen, O. Sangill, P. Lading, G. Miller, “Laser anemometry for control and performance measurements on wind turbines,” , European Union contract JOR3-CT98-0256 (Risø National Laboratory, Roskible, Denmark, 2001), available from the author.
  7. R. D. Callan, C. T. Elliott, N. T. Gordon, D. J. Wilson, A. Best, R. A. Catchpole, C. L. Jones, C. D. Maxey, N. E. Metcalfe, “A high performance minimally cooled CO2 laser receiver,” presented at the 9th Conference on Coherent Laser Radar, Linköbing, Sweden, 23–27 June 1997.
  8. Datasheet for TE Cooled MCT Detector PCI-L-2TE-3; No. 1234, (Vigo Systems, 3 Swietlików St., 01-389 Warsaw, Poland), www.vigo.com.pl .
  9. R. S. Hansen, G. Miller, “A laser anemometer for control and performance measurements on wind turbines,” in Proceedings of the 11th Coherent Laser Radar Conference (Defense Evaluation and Research Agency, Malvern, UK, 2001), p. 1230.
  10. J. M. Hunt, J. F. Holmes, F. Amazajerdian, “Optimum local oscillator levels for coherent detection using photoconductors,” Appl. Opt. 27, 3135–3141 (1988). [CrossRef] [PubMed]
  11. A. Fenigstein, S. E. Schacham, E. Finkman, “Covered electrode HgCdTe photoconductor under high illumination levels,” J. Vac. Sci. Technol. B 10, 1611–1616 (1992). [CrossRef]
  12. D. K. Arch, R. A. Wood, D. L. Smith, “High responsivity HgCdTe heterojunction photoconductor,” J. Appl. Phys. 58, 2360–2370 (1985). [CrossRef]
  13. J. Piotrowski, F. Perry, “Designers still choose mercury cadmium telluride,” Laser Focus World 33, 135–142 (1997).
  14. E. P. G. Smith, C. A. Musca, L. Faraone, “Two-dimensional modelling of HgCdTe photoconductive detectors,” Infrared Phys. Technol. 41, 175–186 (2000). [CrossRef]
  15. S. Mecabih, N. Amrane, B. Belgoumene, H. Aourag, “Opto-electronic properties of the ternary alloy Hg1-xCdxTe,” Physica A 276, 495–507 (2000). [CrossRef]
  16. G. L. Hansen, J. L. Schmidt, T. N. Casselman, “Energy gap versus alloy composition and temperature in Hg1-xCdxTe,” J. Appl. Phys. 53, 7099–7101 (1982). [CrossRef]
  17. A. E. Siegman, Lasers (University Science, Mill Valley, Calif., 1986).
  18. M. R. Spiegel, Mathematical Handbook of Formulas and Tables (McGraw-Hill, New York, 1993).
  19. R. G. Frehlich, “Heterodyne efficiency for a coherent laser radar with diffuse or aerosol targets,” J. Mod. Opt. 41, 2115–2129 (1994). [CrossRef]
  20. D. A. Bowdle, J. Rothermel, J. M. Vaughan, D. W. Brown, M. J. Post, “Aerosol backscatter measurements at 10.6 micrometers with airborne and ground-based CO2 Doppler LIDARs over the Colorado High-Plains. 1. Intercomparison,” J. Geophys. Res. D 96, 5327–5335 (1991). [CrossRef]

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