Optical Phase Conjugation via Four-Wave Mixing in Barium Titanate.
Abstract
Optical phase conjugation is a nonlinear optical phenomenon that replicates a distorted electromagnetic wave. This process has potential in distortion correction, pointing and tracking, improved laser resonators, image enhancement, and optical communcations. Nonlinear effects that can produce a phase conjugate wave include; photorefraction, Brillouin scattering, Raman scattering, Kerr-like four-wave mixing, photon echoes, three wave mixing, and electrorestrictive effects. Photorefraction in a crystal of barium titanate can produce a phase conjugate replica of a laser beam through four-wave mixing. Barium titanate is unique because self generated conjugate returns will form from corner reflections. Self pumped optical phase conjugation was achieved at six wavelength between 457.9 and 514 nm. Factors affecting the return included the laser wavelength, intensity, and angle of incidence with the c axis. The average return amounted to about 25% of the incident beam. The phase conjugate return interacted with the laser modes, significantly increasing the laser power.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1986
- Accession Number
- ADA168908
Entities
People
- James R. Ryan
Organizations
- Naval Postgraduate School