Soviet Physics Uspekhi

Amplification and phase conjugation of weak signals

Oleg V. Kulagin, Guerman A. Pasmanik, Alexander A. Shilov

Published Jun 30, 1992• 13 citations

Abstract

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.

DOI: 10.1070/pu1992v035n06abeh002243

Related papers

AMPLIFICATION AND PHASE CONJUGATION OF WEAK SIGNALS

Oleg V. Kulagin, Guerman A. Pasmanik, Alexander A. Shilov

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.

Journal of Nonlinear Optical Physics & MaterialsJan 1, 19931 citation

Phase conjugation of single photons

N. F. Andreev, V. I. Bespalov, M. A. Dvoretskii +1 more

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.>

IEEE Journal of Quantum ElectronicsMar 1, 198926 citations

Phase conjugation of weak signals

A.M. Scott, D. C. Jones, Kevin D. Ridley +1 more

We describe investigations into the conjugation of weak signals, corresponding to a few photons. We have used a variety of techniques, combining various methods of Brillouin amplification and phase conjugation with a laser pre-amplifier. Four Brillouin phase conjugation techniques were used to amplify or conjugate the signal, and in the case of amplification the conjugate can then be generated using conventional SBS.

IEEE Lasers and Electro-Optics Society Annual Meeting (LEOS)Nov 19, 20020 citations

Some applications of a high-sensitivity optical projection system in physical experiments

Oleg V. Kulagin, Guerman A. Pasmanik, P B Potlov +1 more

An experimental investigation was made of some potential applications, in physical experiments, of a high-sensitivity system for amplification and phase conjugation of weak optical radiation. The results demonstrated, in particular, the feasibility of recording the spatial structure of radiation experiencing spontaneous scattering in various media and a study was made of interference of weak optical beams with a complex transverse structure.

Soviet Journal of Quantum ElectronicsSep 30, 19911 citation

Highly sensitive projection system with a four-wave phase-conjugating mirror and an optical quantum amplifier

Oleg V. Kulagin, Guerman A. Pasmanik, Alexander A. Shilov

An investigation was made of the feasibility of reaching the quantum limit of the sensitivity of a projection system with a brightness amplifier, including a laser amplifier and a phase-conjugating mirror. A sensitivity of about 5 photons per resolution element was achieved in the near infrared (λ = 1.06 μm) when the number of elements in the field of view was ~ 350 × 350.

Soviet Journal of Quantum ElectronicsMar 31, 19906 citations

Energetically Effective Sensitive Four-Wave Phase Conjugating Mirrors

N. F. Andreev, V. I. Bespalov, M. A. Dvoretskii +1 more

The method of the four-wave phase conjugation of weak light signals with a large coefficient of transformation of the pump wave energy into the conjugated wave is studied.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEJan 18, 19850 citations