Analog frequency modulated laser using magnetostriction

Details Analog frequency modulated laser using magnetostriction Analog frequency modulated laser using magnetostriction

1989-11-13

1990-06-26

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Modulation

372 37, 372 39, 372 66, 372 6, 350 9629, H01S 310

Patent

active

049378333

ABSTRACT:
The present invention relates to an analog frequency modulatable laser. The radiation of the lasing medium is analog frequency modulated by change of the optical path length by movement of reflective mirrors forming the resonant cavity at the frequency of radiation of the laser in a manner corresponding to an information signal. In one embodiment, a magnetostrictive material is deposited on and bonded to the outer periphery of an active lasing medium having appropriate mirrors on the ends thereof. The magnetostrictive material is exposed to an information encoded magnetic field and physically expands or contracts the physical length of the lasing medium along the optical axis of the lasing medium corresponding to the modulated information of the magnetic field. In another embodiment an optical fiber is secured by cementing or clamping to a transparent end of the active lasing material and one of the optical cavity reflecting mirrors is disposed on the outside end of the optical fiber with the magnetostrictive material being disposed on the optical fiber.

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Yariv et al., "Proposal for Detection of Magnetic Fields through Magnetosctive Perturbation of Optical Fibers", Opt. Lett. vol. 5, No. 3, Mar. 1980.

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