Self-pumped phase conjugation in Bi12TiO20 crystal without external cavity |
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| Authors: | E Nippolainen VV Prokofiev AA Kamshilin T Jaaskelainen |
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| Institution: | (1) Department of Physics, University of Joensuu, P.O. Box 111, SF-80101, Joensuu, Finland (Fax: +358-13/2513-290, E-mail: Ervin.Nippolainen@joensuu.fi), FI |
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| Abstract: | We present an experimental study of the self-pumped phase-conjugate-mirror (SPPCM) recording in a Bi12TiO20 sample due to the partial internal reflection of the pump beam from the rear face. SPPCM has been recorded under an external
alternating electric field of a square-wave form with response time equal to 170 s at the pump beam intensity of 520 mW/cm2. The mechanism of the SPPCM formation is similar to that of photorefractive double-phase-conjugate mirrors. The most effective
SPPCM is recorded at the much larger pump-beam-incident angle than it could be supposed from the typical angular dependence
of the two-wave-mixing gain factor. Strong dependence of the gain distribution on the pump-beam-propagation angle is observed.
It is found that the response time strongly depends on the preliminary history of the sample.
Received: 11 August 1998 / Revised version: 14 January 1999 / Published online: 28 April 1999 |
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| Keywords: | PACS: 42 65 H |
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