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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Tunable phase conjugation by degenerate four-wave mixing in an injection-seeded solid dye laser cavity

Hideki Watanabe, Takashige Omatsu, Mitsuhiro Tateda

Published Nov 11, 2002• 0 citations
Publisher

Abstract

Summary form only. Tunable phase conjugation in the visible region has received much attention in several application fields such optical image processing, spectroscopy and medical optics in recent years. In this paper, we present an efficient injection-seeded Rhodamine 6G solid-dye laser cavity, which exhibits phase conjugate energy-extraction of >13,000% in the broad-band from 558 nm to 564 nm.

DOI
10.1109/cleoe.2000.909737

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Summary form only given. Efficient phase conjugation in saturable gain medium solid dye has received much attention in application fields such as optical image processing, spectroscopy, and medical optics. For practical phase conjugators, an energy extraction efficiency, defined as a ratio of the extracted phase-conjugate energy to the total beam energy injected externally into the phase conjugator, is a more important parameter than the phase-conjugate reflectivity. We present an efficient phase conjugator by degenerated four-wave mixing in a laser injection-seeded solid dye laser. Energy extraction efficiency as much as 130 was obtained. The solid laser dye was composed of matrix polymethyl methacrylate with 0.1-0.2 wt.% doping of Rhodamine 6G dye.

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Phase Conjugation by Degenerate Four-wave Mixing in Inverted Dye Solutions

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Phase conjugation has been observed in an amplifying medium of rhodamine 6G dye molecules in solution, excited either by flashlamps or by a laser. It is found that the mechanism involved in phase conjugation is degenerate four-wave mixing through gain saturation, and reasonable agreement obtained with the theory of saturable amplifiers. A phase-conjugate signal was observed over the tuning range of the dye system (580–605 nm) and a reflectivity up to a maximum of 25% was obtained.

Journal of Modern Optics•May 1, 1988•0 citations

Investigation of degenerate four-wave mixing and phase conjugation in organic dye solutions

Ang Z

Phase conjugation of backward-and forward-wave produced by degenerate four-wave mixing using a nearly resonantly enhanced nonlinearity in four-level organic dye solutions was investigated. The conversion efficiency of 22% has been obtained in a 2.5×10-5-molar solution of chlorophyll A in methylalcohol with a 5mm interaction length and a pumping energy of ～8mj from SH of a Q-switched Nd:YAG. Degenerate four-wave mixing by two-photon resonant-enhancement in the solution of rhodamine 6G in alcohol was investigated. Measurements were performed which described the dependance of nonlinear reflectivities on the molar concentrations of the media and the intensities of the pumping and object waves. Phase conjugation characteristics of forward-wave in four-wave mixing process were theoretically analysed. Experiments have confirmed the theoretical prediction. The method of quartet degenerate four-wave mixing has been extended to the doublet degenerate casa. Using this method, image conversion from 1.06μm to 5320 A has been realized with a conversion efficiency of 25% in a 5 mm long saturable absorber made of organic dye 9740 solution in diehloroethane. Theoretical analysis shows that using a medium, which is a near resonant absorber for the infrared object wave but transparent for the visible reconstruction wave, the conversion efficiency may be well in excess of unity.

Acta Optica Sinica•Jan 1, 1981•0 citations
Summary form only. Tunable phase conjugation in the visible region has received much attention in several application fields such optical image processing, spectroscopy and medical optics in recent years. In this paper, we present an efficient injection-seeded Rhodamine 6G solid-dye laser cavity, which exhibits phase conjugate energy-extraction of >13,000% in the broad-band from 558 nm to 564 nm.
Summary form only given. Efficient phase conjugation in saturable gain medium solid dye has received much attention in application fields such as optical image processing, spectroscopy, and medical optics. For practical phase conjugators, an energy extraction efficiency, defined as a ratio of the extracted phase-conjugate energy to the total beam energy injected externally into the phase conjugator, is a more important parameter than the phase-conjugate reflectivity. We present an efficient phase conjugator by degenerated four-wave mixing in a laser injection-seeded solid dye laser. Energy extraction efficiency as much as 130 was obtained. The solid laser dye was composed of matrix polymethyl methacrylate with 0.1-0.2 wt.% doping of Rhodamine 6G dye.
Phase conjugation of backward-and forward-wave produced by degenerate four-wave mixing using a nearly resonantly enhanced nonlinearity in four-level organic dye solutions was investigated. The conversion efficiency of 22% has been obtained in a 2.5×10-5-molar solution of chlorophyll A in methylalcohol with a 5mm interaction length and a pumping energy of ～8mj from SH of a Q-switched Nd:YAG. Degenerate four-wave mixing by two-photon resonant-enhancement in the solution of rhodamine 6G in alcohol was investigated. Measurements were performed which described the dependance of nonlinear reflectivities on the molar concentrations of the media and the intensities of the pumping and object waves. Phase conjugation characteristics of forward-wave in four-wave mixing process were theoretically analysed. Experiments have confirmed the theoretical prediction. The method of quartet degenerate four-wave mixing has been extended to the doublet degenerate casa. Using this method, image conversion from 1.06μm to 5320 A has been realized with a conversion efficiency of 25% in a 5 mm long saturable absorber made of organic dye 9740 solution in diehloroethane. Theoretical analysis shows that using a medium, which is a near resonant absorber for the infrared object wave but transparent for the visible reconstruction wave, the conversion efficiency may be well in excess of unity.