'Optical Phase Conjugation in Photorefractive Materials'
Abstract
The photorefractive crystal barium titanate has been studied for its inherent physical properties and for its applications, including the locking together of separate laser beams. The output beams of two separate argon-ion lasers were locked together to within less than one Hz for an indefinite time. The technique uses four-wave mixing in the barium titanate crystal. A ring self- pumped phase conjugator was altered by inserting a nonreciprocal phase element in the ring so as to break its time-reversal symmetry. The device could be made to produce controlled frequency shifts and new output modes. Applications of this device are in mode conversion for optical computing. A transient detection microscope was invented which displays the images of moving objects, and which removes the stationary background. This all-optical device uses two-wave mixing in a barium titanate crystal. (jhd)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 28, 1988
- Accession Number
- ADA221210
Entities
People
- Joshua Feinberg
Organizations
- University of Southern California