Nonlinear optical phenomena and devices

Observation of optical memory in paraelectric DKDP

B. V. Anikeev, D. V. Sin'ko

Volgograd State University

Abstract: An image of an object in the form of a two-dimensional phase grating with a period of 0.4 mm was stored for the first time in a DKDP crystal at room temperature by pulsed neodymium laser radiation. The laser operated in the free-running regime. The threshold for detection of the photorefractive effect, discovered earlier in the same crystal, was 4 J cm^–2 at room temperature. The storage of an image was deduced from the pattern of diffraction of an He — Ne laser beam (wavelength 0.63 μm) by the phase grating. The experimental results indicated that the diffraction pattern represented a transverse distribution of the neodymium laser radiation power in the bulk of the crystal.

PACS: 42.65.Hw, 42.79.Vb

Received: 01.01.1996

 English version: Quantum Electronics, 1996, 26:3, 245–247

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