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Scientific American

Optical Phase Conjugation

Vladimir V. Shkunov, Boris Ya Zel'dovich

Published Dec 1, 1985• 70 citations
Publisher
DOI
10.1038/scientificamerican1285-54

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The results of the study on phase conjugation of weak optical signals with an energy of several photons are considered. Basic concepts of a semi-classical theoretical approach to describe amplification and phase conjugation (PC) of such signals are presented. A review is given of the experimental investigations that allowed reaching a limiting (about 1 photon per mode) sensitivity of optical systems with PC-mirrors for a large (~105) number of resolution elements. High-sensitivity PC-mirror optical systems are demonstrated for a variety of applications.
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.