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Applied Physics Letters

Nonlinear optical phase conjugation using F+3 centers in LiF crystals

Hongen Gu, Lan Qi, Liangfeng Wan

Published Mar 27, 1989• 2 citations
Publisher

Abstract

We report the experimental observation of nonlinear optical phase conjugation using F+3 centers in LiF crystals. Using a pulsed dye laser (460 nm) as pump light, a maximum phase conjugate reflectivity of about 0.1% was obtained.
DOI
10.1063/1.100748

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We present optical phase conjugation based on the degenerate four‐wave mixing (DFWM) arrangement in gelatin films doped with acid blue 3 dye (FAST GREEN FCF) using He‐Ne laser of total power 50 mW. Various parameters which influence the phase‐conjugate (PC) signal during the DFWM process were studied (angle of between the forward pump and the probe beam, transition of gelatin film, reflectivity as a function of forward and backward beam). A maximum phase‐conjugate beam reflectivity of about 0.02% has been observed in these dye‐doped gelatin films. PACS: 42.65.‐k, 42.65.Hw.
Single-beam phase conjugation (self-phase conjugation, or SPC) was observed in the ferroelectric crystal LiNbO3:Fe using CW HeNe laser (wavelength 632 nm power 10-36 mW). Effective "out/in" reflection coefficient of phase conjugation (defined as the ratio the output phase-conjugated beam to the input laser beam measured before optical elements) was about 30%. For some crystals efficient phase conjugation was followed by the simultaneous generation of Fabry-Perot modes. Phase locking of two HeNe lasers and imaging of the amplitude objects with the help of self-phase conjugation was demonstrated. Appearances of additional beams (in transmission and reflection) have some analogy with the predicted behavior of the "negative-index materials".