Oscillatory mode coupling between two coherent laser beams is produced when an interference pattern moves against a quasi-static electrically strobed grating in a photorefractive AlGaAs/GaAs multiple-quantum-well diode operated in the quantum-confined Stark geometry. The oscillation frequency is equal to the frequency difference between the two laser beams and provides a method to measure high-frequency Doppler shifts or large surface displacements for laser-based ultrasound. Combined photorefractive gains (normally forbidden by symmetry in the Stark geometry) and absorptive gains approach 1200cm<sup>-1</sup>during two-wave mixing using moving gratings.
© 1998 Optical Society of America
I. Lahiri, D. D. Nolte, M. R. Melloch, and M. B. Klein, "Oscillatory mode coupling and electrically strobed gratings in photorefractive quantum-well diodes," Opt. Lett. 23, 49-51 (1998)