Topic
Phase conjugation
About: Phase conjugation is a research topic. Over the lifetime, 3694 publications have been published within this topic receiving 49099 citations.
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TL;DR: In this article, the authors discuss how conventional (static/linear) optical elements can compensate for many classes of time-varying phase distortions in optical trains, including thresholds, pumps, and frequency translations.
Abstract: We discuss how novel arrangements of conventional (static /linear) optical elements can compensate for many classes of time -varying phase distortions in optical trains. Precision corner arrays, lens arrays, and K- mirror arrays are all applicable as pseudoconjugation elements in certain classes of problems. In some cases multipassing (four or more passes) of a distorting medium can offer improved performance. Although the compensation is more limited than that available from nonlinear optical phase conjugation (NOPC), problems associated with thresholds, pumps, and frequency translations are eliminated. Abstract. We discuss how novel arrangements of conventional (static/linear) optical elements can compensate for many classes of time-varying phase distortions in optical trains. Precision corner arrays, lens arrays, and K-mirror arrays are all applicable as pseudoconjugation elements in certain classes of problems. In some cases multipassing (four or more passes) of a distorting medium can offer improved performance. Although the compensation is more limited than that available from nonlinear optical phase conjugation (NOPC), problems associated with thresholds, pumps, and frequency translations are eliminated.
19 citations
Proceedings Article•
18 Jun 1984TL;DR: In this paper, the authors determined that Semi insulating GaAs has a prominent photorefractive effect, with a spectral response peaked near 1.06 µm, for operation at visible wavelengths.
Abstract: There is an ongoing need for an efficient nonlinear material at 1.06 µm for a variety of applications. For operation at visible wavelengths, much recent attention has been focused on photorefractive materials such as LiNbO3, KNbO3 and BaTiO3. These materials are efficient, but their spectral response is unfavorable for operation at wavelengths longer than ~600 nm. We have determined that Semi insulating GaAs has a prominent photorefractive effect, with a spectral response peaked near 1.06 µm.
19 citations
TL;DR: Passive phase conjugation of up to six lines (457, 476, 488, 496, 501, and 514 nm) of the all lines output of an argon ion laser is reported in this paper.
Abstract: Passive phase conjugation of up to six lines (457, 476, 488, 496, 501, and 514 nm) of the all lines output of an argon ion laser is reported. Imaging characteristics and reflectivity measurements are given. In general, multiline operation results in some loss in both reflectivity and image resolution. This work opens the possibility for passive phase conjugation of full color images.
19 citations
TL;DR: In this paper, the nucleation of a pair of vortices in the field of a boundary dominated confocal photorefractive phase-conjugate resonator is studied in detail.
Abstract: The nucleation of a pair of vortices in the field of a boundary dominated confocal photorefractive phase-conjugate resonator is studied in detail. A phase instability is seen to precede the nucleation which occurs when the phase step reaches a threshold of π. The validity of a scenario based on the competition of a few modes is verified experimentally using a multichannel optical correlator equipped with matched filters designed to identify the modes presumed by the model.
19 citations
TL;DR: In this article, the reflectivity of an external ring phase conjugate mirror is measured as a function of temperature for 515 nm radiation, and the maximum reflectivity is 26% at 124 °C.
Abstract: Self‐pumped phase conjugation is observed using a KNbO3 crystal. The reflectivity of an external ring phase conjugate mirror is measured as a function of temperature for 515 nm radiation. The maximum reflectivity is 26% at 124 °C. On cooling, the reflectivity decreases and vanishes completely below 62 °C. The phase conjugate nature of the retroreflected beam is illustrated. The temperature‐dependent response time is shown to be proportional to (T−56 °C)−1.
19 citations