Abstract

We demonstrate that holographic speckle-free imaging is possible when a dynamic recording medium, such as a Bi₁₂SiO₂₀ crystal, and a four-wave mixing configuration are used. The method is based on time integration in the conjugate-image plane of N coherent images having an independent speckle pattern. We apply this concept to a real-time optical processing operation. A speckle-free time-averaged interferogram of a vibrating structure is obtained.

© 1980 Optical Society of America

Phase-conjugation and spatial-frequency dependence of wave-front reflectivity in Bi₁₂SiO₂₀ crystals

J. P. Huignard, J. P. Herriau, G. Rivet, and P. Günter
Opt. Lett. 5(3) 102-104 (1980)

Amplified phase-conjugate beam reflection by four-wave mixing with photorefractive Bi₁₂SiO₂₀ crystals

H. Rajbenbach, J. P. Huignard, and Ph. Refrégier
Opt. Lett. 9(12) 558-560 (1984)

Two-wave mixing and energy transfer in Bi₁₂SiO₂₀ crystals: application to image amplification and vibration analysis

J. P. Huignard and A. Marrakchi
Opt. Lett. 6(12) 622-624 (1981)

Holographic interferometry using anisotropic self-diffraction in Bi₁₂SiO₂₀

R. C. Troth and J. C. Dainty
Opt. Lett. 16(1) 53-55 (1991)

Two-wave mixing in photorefractive Bi₁₂SiO₂₀ fibers

Alexei A. Kamshilin, Raimo Silvennoinen, Timo Jaaskelainen, Claudio J. Lima, Marcello R. B. Andreeta, and Victor V. Prokofiev
Opt. Lett. 18(9) 690-692 (1993)