Dynamic joint-fourier-transform correlator by Bragg diffraction in photorefractive Bi12SiO20 crystals

Abstract Real-time cross correlation between two transparencies using photorefractive Bi 12 SiO 20 crystals is presented. A classical two-lens coherent optical processor is used to simultaneously record and read a dynamic phase-volume hologram. The device works at low power level ( P i ≈200μW in the spectrum at λ=488 nm) and short cycle time τ(τ≈25 ms).

[1]  A Yariv,et al.  Spatial convolution and correlation of optical fields via degenerate four-wave mixing. , 1978, Optics letters.

[2]  C. R. Christensen,et al.  Coherent optical processing: Another approach , 1979 .

[3]  A D Gara,et al.  Real-time tracking of moving objects by optical correlation. , 1979, Applied optics.

[4]  J. Goodman.  Introduction to Fourier optics , 1969 .

[5]  J. Goodman,et al.  A technique for optically convolving two functions. , 1966, Applied optics.

[6]  I. N. Matveev,et al.  Nonlinear optics methods in conversion of spatially modulated signals , 1977 .

[7]  Amnon Yariv,et al.  Real‐time image processing via four‐wave mixing in a photorefractive medium , 1980 .

[8]  V. V. Kulikov,et al.  Light diffraction and nonlinear image processing in electrooptic Bi12SiO20 crystals , 1979 .

[9]  F. Micheron,et al.  High‐sensitivity read‐write volume holographic storage in Bi12SiO20 and Bi12GeO20 crystals , 1976 .

[10]  Some polarization properties of volume holograms in Bi(12)SiO(20) crystals and applications. , 1978, Applied optics.

[11]  T. Lee,et al.  Dual-axis joint-Fourier-transform correlator. , 1979, Optics letters.

[12]  H. Kogelnik.  Coupled wave theory for thick hologram gratings , 1969 .

[13]  J. Rebholz,et al.  Ambiguity processing by joint Fourier transform holography , 1979, IEEE Journal of Quantum Electronics.

[14]  J P Huignard,et al.  Phase-conjugate wavefront generation via real-time holography in Bi12SiO20 crystals. , 1979, Optics letters.