Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1991-11-04
1992-12-08
Lerner, Martin
Optical: systems and elements
Holographic system or element
Having particular recording medium
359300, 359338, G02F 135, H01S 310
Patent
active
051702681
ABSTRACT:
A polarization independent energy exchanger transfers optical energy from a first coherent beam of optical energy to a second coherent beam of optical energy where the second beam is coherent with respect to the first beam, the second beam is counterpropagating with respect to the first beam, and the second beam possesses substantially the same polarization as the first beam. The energy exchanger includes a nonlinear optical uniaxial crystal having electro-optic coefficients r.sub.13 and r.sub.23 of equal magnitude and having a sufficiently large photorefractive charge density to achieve efficient contradirectional two-beam coupling, independent of the polarization states of the first and second beams. The crystal is oriented to receive the first and second beams therein such that the optic axis of the crystal is aligned parallel to the propagation directions of the first and second beams. The invention also envisions a polarization-independent backscattering phase conjugator for transferring optical energy from a first coherent beam of optical energy to a second coherent beam of optical energy where the second beam is the counterpropagating phase-conjugate reflection of the first beam. In this embodiment, a nonlinear optical uniaxial is provided with electro-optic coefficients r.sub.13 and r.sub. 23 of equal magnitude and having a sufficiently large photorefractive charge density to achieve efficient phase-conjugate backscattering, indepe n
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Ewbank Mark D.
Vazquez Rene A.
Deinken John J.
Lerner Martin
Rockwell International Corporation
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