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Acta Physica Sinica

The dynamic conversion from self-defocusing to self-focusing and the phase conjugate bright spatial soliton*

Liu Si-Min, Dayun Wang, Zhao Hong-E, Li Zhu-Bin, Guo Ru, Lu Yi, Huang Chun-Fu, Gao Yuan-Mei, (1)南开大学物理学院,天津300071; (2)南开大学物理学院,天津300071;北京师范大学物理系,北京100875; (3)天津理工大学自动化系,天津30019

Published Jan 1, 2002• 3 citations

Abstract

We have further studied experimentally and theoretically the process of conversion from self-defocusing to self-focusing in LiNbO—3:Fe crystals, which was reported in Acta Phys.Sin.[STHZ]50[STBZ] 483. Based on our experimental result, we have proposed a new type of theoretical model of phase conjugate resonant cavity, analyzed the role of the cavity in the process of conversion from self-defocusing to selffocusing. We have also proposed a new type of bright spatial soliton, i.e.,the phase conjugate bright spatial soliton, and indicated that the bright spatial soliton is a mode in the phase conjugate resonate cavity.

DOI: 10.7498/aps.51.2761

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Stationary photorefractive self-pumped phase-conjugation with one four-wave-mixing interaction region, stimulated by the photorefractive amplified backward scattering, is obtained in LiNbO 3 :Fe crystals, in which the strong backward scattered light is gotten by putting a scattering particle on the backface of the sample. Even though its reflectivities are not high (its temporal and stationary reflectivities are 10% and 3%, respectively), due to the low electrooptic coefficients of LiNbO 3 :Fe crystals, our experimental results prove that this mechanism is effective and simple comparing with the "cat" self-pumped phase-conjugator.