Abstract

The dc photocurrents generated by steady-state moving space-charge fields inside photoconductive semiconductors containing deep level donors and traps can be used to determine the relative frequency differences between the two interfering optical fields that establish the space-charge fields. A simple laser velocimeter that uses a semi-insulating GaAs:Cr sample to detect the Doppler frequency shift between two laser beams is demonstrated.

© 1995 Optical Society of America

Moving space-charge field effects in photoconductive semiconductors with interband optical excitation of free charge carriers

Chen-Chia Wang, Frederic Davidson, and Sudhir Trivedi
J. Opt. Soc. Am. B 14(1) 21-26 (1997)

Optical spectral analysis using moving space-charge field effects in photoconductive semiconductors

Chen-Chia Wang and Frederic Davidson
J. Opt. Soc. Am. B 13(7) 1376-1383 (1996)

Optical spectrum analyzer of a new design

Chen-Chia Wang and Frederic Davidson
Opt. Lett. 20(9) 1035-1037 (1995)

Optical phase-lock loops with photoconductive semiconductor phase detectors

Frederic Davidson, Chen-Chia Wang, and Sudhir Trivedi
Opt. Lett. 19(11) 774-776 (1994)

Transient photocurrents in photoconductive semiconductors generated by step-phase modulations

Frederic Davidson, Chen-Chia Wang, and Sudhir Trivedi
Opt. Lett. 20(2) 175-177 (1995)