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Soviet Journal of Quantum Electronics

Threshold sensitivity of a projection optical system based on a brightness amplifier with a four-wave hypersonic phase-conjugating mirror under absolute instability conditions

Oleg V. Kulagin, Guerman A. Pasmanik, P B Potlov, Alexander A. Shilov

Published Nov 30, 1990• 5 citations
Publisher

Abstract

The threshold (maximum) sensitivity was achieved experimentally for a projection system comprising a highly sensitive four-wave hypersonic phase-conjugating mirror and optical quantum amplifiers. The sensitivity at λ = 1.054 μm amounted to 4.8 × 10 − 19 J (2.4 photons) per resolution element. The results obtained were confirmed by theoretical estimates.

DOI
10.1070/qe1990v020n11abeh007545

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The threshold (maximum) sensitivity was achieved experimentally for a projection system comprising a highly sensitive four-wave hypersonic phase-conjugating mirror and optical quantum amplifiers. The sensitivity at λ = 1.054 μm amounted to 4.8 × 10 − 19 J (2.4 photons) per resolution element. The results obtained were confirmed by theoretical estimates.
Phase conjugation (PC) of extremely weak signals using a phase-conjugate mirror based on Mandelstam-Brillouin-enhanced four-wave mixing, coupled with an optical quantum amplifier, is considered. PC of a pulse with energy 4*10/sup -17/ J is achieved. PC conditions for amplified superluminescence noise of the optical quantum amplifier are specified and the limiting parameters are estimated. It is shown experimentally that if the signal-to-noise ratio (S/N) is equal to unity, the energy of an input signal for which phase conjugation is possible corresponds to 30 photons per transverse mode.>
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.
The results of the study on phase conjugation of weak optical signals with the energy of units of 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 on the experimental investigations that allowed for reaching a limit (about 1 photon for a 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.