Optical: systems and elements – Optical modulator – Light wave directional modulation
Patent
1996-10-30
1998-03-10
Font, Frank G.
Optical: systems and elements
Optical modulator
Light wave directional modulation
359302, G02B 2608
Patent
active
057267952
ABSTRACT:
A compact loop four-wave mixing phase conjugator that can be used in practical optical applications comprises a reflective nonlinear cell, relay optics, an optical gain medium, and an optical diode that together form a unidirectional ring laser resonator. In operation, a signal beam .epsilon..sub.1 is directed to the nonlinear cell, where it passes through a nonlinear medium contained within the cell and is reflected out of the cell as loop beam .epsilon..sub.2. The relay optics direct loop beam .epsilon..sub.2 through the optical diode, optical gain medium, and back to the nonlinear cell, where it intersects and optically interferes with the signal beam .epsilon..sub.1 to form a refractive index grating in the nonlinear medium. The optical diode and gain medium are positioned in the 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 .epsilon..sub.2. A portion of oscillation beam .epsilon..sub.3 is transmitted by the refractive index grating, reflects off the reflective portion of the nonlinear cell and emerges from the cell as phase conjugate output beam .epsilon..sub.4.
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Betin Alexander A.
Mangir Metin S.
Rockwell David A.
Denson-Low W. K.
Duraiswamy V. D.
Font Frank G.
Hughes Electronics
Kim Robert
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