Coherent light generators – Particular beam control device – Mode locking
Patent
1980-06-03
1982-07-13
Sikes, William L.
Coherent light generators
Particular beam control device
Mode locking
372 26, 350358, H01S 3098
Patent
active
043398219
ABSTRACT:
An acousto-optic mode-locked laser comprises a piezo-electric, acousto-optic crystal disposed within the cavity of a laser in the path of the laser beam, and a radio-frequency energized interdigital transducer (IDT) array coupled to the crystal so as to launch bulk shear waves in the crystal for a limited number of interactions with the laser beam. The IDT is mounted on a first plane surface of the crystal opposite from a second plane surface thereof which is disposed at an acute angle .theta. to the first surface and which is nominally parallel to the laser beam. Bulk shear waves are launched in the crystal by the IDT at the first surface at the angle .theta. to a normal to that surface with the forward wave traversing the laser beam perpendicular to its axis and being reflected back through the beam by the opposite or second crystal surface to form standing waves which modulate the beam. This reflected wave thereafter is reflected by the first surface out of the interaction zone so as to be ineffective in establishing additional standing waves. Optimum efficiency of shear wave generation is achieved when
REFERENCES:
patent: 3944335 (1976-03-01), Saito et al.
patent: 4019155 (1977-04-01), Gorog et al.
patent: 4126834 (1978-11-01), Coppock
Coppock Richard A.
Reed Edward D.
GTE Products Corporation
Lawler John F.
Sikes William L.
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