Optical: systems and elements – Diffraction – Using fourier transform spatial filtering
Reexamination Certificate
2005-01-11
2005-01-11
Mack, Ricky (Department: 2873)
Optical: systems and elements
Diffraction
Using fourier transform spatial filtering
C359S279000
Reexamination Certificate
active
06842285
ABSTRACT:
The present invention provides a method and a system for generating a phase-modulated wave front. According to the present invention, the spatial phase-modulation is not performed on the different parts of the wave front individually as in known POSLMs. Rather, the spatial phase-modulation of the present invention is performed by generating an amplitude modulation in the wave front, Fourier or Fresnel transforming the amplitude modulated wave front, filtering Fourier or Fresnel components of the Fourier or Fresnel distribution with a spatial filter such as a phase contrast filter, and regenerating the wave front whereby the initial amplitude modulation has transformed into a phase-modulation.
REFERENCES:
patent: 5579136 (1996-11-01), Fukui et al.
patent: 5736958 (1998-04-01), Turpin
Yukihiro Ishii et al., “Real-time phase -only matched filtering with dual liquid-crystal spatial light modulators”, Optics Communications, vol. 132, Nov. 15, 1996, pp. 153-160.
Christophe Gorecki et al., “Real-Time Pattern Recognition by Vanderlugt Correlator Using Amplitude and Phase Modulation Properties of the Epson Liquid-Crystal TV”, Optical Review, vol. 3, No. 3, 5/96, pp. 171-176.
D. Casasent (Ed.), “Optical Data Processing”, 1978, Springer-Verlag, Berlin, DE, XP002182118, pp. 65-66.
Jesper Gluckstad et al., “Reverse phase contrast for the generation of phase-only spatial light modulation”, Optics Communications, vol. 197, Oct. 1, 2001, pp. 261-266.
Mack Ricky
Riso National Laboratory
Tra Tuyen
Volentine & Francos, PLLC
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