Optical: systems and elements – Optical modulator – Light wave directional modulation
Patent
1996-10-30
1998-03-17
Font, Frank G.
Optical: systems and elements
Optical modulator
Light wave directional modulation
359302, 359303, G02B 2608
Patent
active
057293805
ABSTRACT:
A loop four-wave mixing phase conjugator that can be used with depolarized signal beams comprises a polarization separator, a polarization mixer, an optical diode, a gain medium and relay optics that together form a unidirectional laser resonator. In operation, the polarization separator separates a signal beam .epsilon..sub.1 into orthogonally polarized signal beam components .epsilon..sub.11 and .epsilon..sub.12 and directs them to a nonlinear medium. The components propagate through the nonlinear medium and emerge as loop beam .epsilon..sub.2, with orthogonally polarized components .epsilon..sub.2 and .epsilon..sub.22. The polarization mixer mixes the energy from the two orthogonally polarized loop beam components, and relay optics direct the loop beam components back to the nonlinear medium at an angle with respect to the input beam. The loop beam components intersect and optically interfere with signal beam components .epsilon..sub.11 and .epsilon..sub.22 in the nonlinear medium to form gratings. The optical diode and gain medium are positioned in the optical loop so that an oscillation beam .epsilon..sub.3 builds up from optical noise in the resonator and oscillates in a direction counter to the propagation direction of loop beam components .epsilon..sub.21 and .epsilon..sub.22. A portion of oscillation beam .epsilon..sub.3 is transmitted by the gratings, and exits the optical loop as an output beam .epsilon..sub.4. .epsilon..sub.3 is phase conjugate to the input beam .epsilon..sub.1 in both the spatial and polarization senses.
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Betin Alexander A.
Mangir Metin S.
Denson-Low W. K.
Diraoswamy V. D.
Font Frank G.
Hughes Electronics
Kim Robert
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