Amplification and phase conjugation of weak signals

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 $(\sim10^5)$ number of resolution elements. High-sensitivity PC-mirror optical systems are demonstrated for a variety of applications.

PACS: 42.65.Hw, 42.79.Bh, 42.30.−d (all)
DOI: 10.1070/PU1992v035n06ABEH002243
URL: https://ufn.ru/en/articles/1992/6/d/
Citation: Kulagin O V, Pasmanik G A, Shilov A A "Amplification and phase conjugation of weak signals" Sov. Phys. Usp. 35 (6) 506–519 (1992)

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Оригинал: Кулагин О В, Пасманик Г А, Шилов А А «Усиление и обращение волнового фронта слабых сигналов» УФН 162 (6) 129–157 (1992); DOI: 10.3367/UFNr.0162.199206d.0129

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