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Applied Optics

Applied Optics


  • Vol. 33, Iss. 6 — Feb. 20, 1994
  • pp: 915–920

Sensitivity of non-steady-state photoelectromotive force-based adaptive photodetectors and characterization techniques

S. I. Stepanov  »View Author Affiliations

Applied Optics, Vol. 33, Issue 6, pp. 915-920 (1994)

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The light-to-electricity conversion efficiency of the non-steady-state photoelectromotive force effect and its threshold sensitivity for the detection of phase-modulated optical signals and space-charge electric fields are evaluated. It is shown that for the optimal conditions of operation (the carrier spatial frequency is equal to the inverse diffusion length of the photocarriers, the detected frequency is higher than the cutoff frequency of the electromotive force signal, and the load resistance is higher than the resistance of the sample), the generation–recombination noise is approximately equal to the thermal noise of the sample resistance. In this case the threshold sensitivity of the adaptive photodetector without an external dc bias is independent of the parameters of the crystal used and can be only 4 2 times lower than that caused by the generation–recombination noise in a conventional photoresistor. Unlike in photodiodes and photoresistors, the output noise caused by laser intensity fluctuations is of the multiplicative type in the adaptive photodetectors.

© 1994 Optical Society of America

Original Manuscript: July 6, 1992
Revised Manuscript: May 27, 1993
Published: February 20, 1994

S. I. Stepanov, "Sensitivity of non-steady-state photoelectromotive force-based adaptive photodetectors and characterization techniques," Appl. Opt. 33, 915-920 (1994)

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  1. G. S. Trofimov, S. I. Stepanov, “Non-steady-state holographic currents in photorefractive crystals,” Fiz. Tverd. Tela 28, 2785–2789 (1986)[Sov. Phys. Solid State 28, 1559–1562 (1986)];M. P. Petrov, S. I. Stepanov, G. S. Trofimov, “Non-steady-state EMF in nonuniformly illuminated photoconductor,” Pis'maZh. Tekh. Fiz. 12, 916–921 (1986)[Sov. Tech. Phys. Lett. 12, 379–381 (1986)].
  2. M. P. Petrov, I. A. Sokolov, S. I. Stepanov, G. S. Trofimov, “Non-steady-state photo-EMF induced by dynamic gratings in partially compensated photoconductors,” J. Appl. Phys. 68, 2216–2225 (1990). [CrossRef]
  3. S. I. Stepanov, G. S. Trofimov, I. A. Sokolov, V. I. Vlad, I. Apostol, D. Popa, “Measuring vibration amplitudes in the picometer range using moving light gratings in photoconductive GaAs:Cr,” Opt. Lett. 15, 1239–1241 (1990). [CrossRef] [PubMed]
  4. I. A. Sokolov, S. I. Stepanov, G. S. Trofimov, “Detection of small vibrations of diffusely scattering objects with GaAs:Cr adaptive photodetectors,” Akust. Zh. 37, 998–1005 (1991).
  5. N. A. Korneev, S. I. Stepanov, “Measurement of small lateral vibrations of speckle patterns using a non-steady-state photo-EMF in GaAs:Cr,” J. Mod. Opt. 38, 2153–2158 (1991). [CrossRef]
  6. I. A. Sokolov, S. I. Stepanov, “Non-steady-state photo-EMF in crystals with long relaxation time of photoconductivity,” Electron. Lett. 26, 1275–1277 (1990). [CrossRef]
  7. S. I. Stepanov, G. S. Trofimov, “Non-steady-state photo-EMF in crystals with bipolar photoconductivity,” Fiz. Tverd. Tela 31, 89–92 (1989)[Sov. Phys. Solid State 31, 49–50 (1989)].
  8. S. I. Stepanov, “Adaptive interferometry—a new area of application of photorefractive crystals,” in International Trends in Optics, J. Goodman, ed. (Academic, Boston, Mass., 1991), pp. 125–140.
  9. M. P. Petrov, S. I. Stepanov, A. V. Khomenko, Photorefractive Crystals in Coherent Optics (Springer-Verlag, Berlin, 1991).
  10. A. Van der Ziel, Noise in Measurements (Wiley, New York, 1976).
  11. R. L. Forward, “Wideband laser-interferometer gravitational-radiation experiment,” Phys. Rev. D 17, 379–390 (1978). [CrossRef]

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