We describe how two-wave mixing of light scattered at the entrance face of a photorefractive crystal can be used to measure the frequency difference between two independent lasers. This method can be used to accomplish initial frequency acquisition in coherent optical homodyne receivers.
© 1994 Optical Society of America
Original Manuscript: July 6, 1993
Published: January 15, 1994
Christopher T. Field and Frederic Davidson, "Frequency acquisition with photorefractive two-wave mixing," Opt. Lett. 19, 78-80 (1994)