Optical processing and phase conjugation

J. A. Tataronis, Bahaa E. A. Saleh

The generation of phase conjugated replicas of optical signals has been the subject of many theoretical and experimental studies. Phase conjugation of harmonic signals is a byproduct of certain nonlinear processes such as degenerate four- wave mixing and stimulated Brillouin scattering. Although conjugation of steady signals is well established, the possibility and the effectiveness of conjugating unsteady signals remain largely unexplored. When the envelope of an optical signal varies, new physical phenomena in the conjugation process arise. As previously shown,1 dispersion in the conjugation process distorts the phase conjugate replica of a pulsed signal. Distortion appears even if the response of the medium to the applied optical signal is instantaneous.

Anthony E.. Siegman, Concetto R. Giuliano

Vladimir V. Shkunov, Boris Ya Zel'dovich

Timothy T. Grove, E. Rousseau, X. Xia +3 more

Optical phase conjugation (OPC) is of interest for many applications. The generation of squeezed light, phase-conjugate mirrors, optical correlation, and turbulence correction would all benefit from improved OPC performance. Using Zeeman sublevels and cross-circularly polarized light in rubidium vapor, we demonstrate an OPC process that uses very low power (30 mW) but is still very fast (60 ns) and efficient (gain of 20). This process is generic enough to be applicable to almost any resonant medium.

T. Hirose, Takashige Omatsu, Mitsuhiro Tateda

Summary form only given. Vectorial phase conjugation (VPC) is an effective technique of eliminating phase and polarization aberrations in optical systems. Applications of VPC in visible region include optical image processing and optical computing. We present what we believe the first demonstration of visible vectorial phase conjugator (VPC) in a laser-pumped polymer laser dye Rhodamine 6G in PMMA matrix.

Prem Ballabh Bisht