Apparatus for generating orthogonally polarized beams having dif

Coherent light generators – Particular beam control device – Modulation

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372 22, 372 23, 372 13, 372100, 372105, H01S 310

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059178442

ABSTRACT:
Electro-optical devices for transforming a single-frequency, linearly polarized input beam from a light source introduced into a multifaceted anisotropic acousto-optical crystal into an output beam having two orthogonally polarized, output beam components that differ in frequency from each other and may be parallel or have a predetermined angle of divergence between them. The energy flux profiles of the output beam components may be spatially separated, partially coextensive, or substantially coextensive in accordance with the birefringence, acoustical, and optical properties of the acousto-optical crystal and/or the use of external elements for particular device embodiments. The input beam is introduced to the acousto-optical crystal for travel through an interactive region where it experiences an acoustic beam that diffracts it via small angle Bragg diffraction to form two orthogonally polarized internal beam components that are separated by a small angle of divergence and subsequently are controlled to become beam components available outside of the acousto-optical crystal for use in downstream applications. Thermal compensation may be provided via the use external phase retardation plates and principles of symmetry, and high diffraction efficiency may be achieved via the use of multiple passes through the interaction zone.

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