Bird-wing phase conjugator using mutually incoherent laser beams

Details Bird-wing phase conjugator using mutually incoherent laser beams Bird-wing phase conjugator using mutually incoherent laser beams

1988-08-05

1990-03-27

LaRoche, Eugene R.

G02F 135

Patent

active

049115375

ABSTRACT:
A nonlinear optical system for phase conjugating two mutually incoherent beams of light having the same nominal wavelength includes a photorefractive crystal having a preferred fanning direction, a first face whose surface normal is perpendicular to the preferred fanning direction, and a second face parallel to the first face. A first beam of coherent light having a wavelength .lambda. is incident on the first face of the crystal and makes an acute angle with the preferred fanning direction of the crystal, while a second beam of coherent light which is mutually incoherent with the first beam and has the same nominal wavelength is incident on the second face of the crystal and also makes an acute angle with the preferred fanning direction of the crystal. With this arrangement, the first beam and the second beam photorefractively fan toward a third face of the crystal to produce a set of shared photorefractive fanning holograms which channel light from the first and second beams toward the third face.

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