Folded cavity laser for holography

Details Folded cavity laser for holography Folded cavity laser for holography

1985-04-26

1986-01-14

Sikes, William L.

Coherent light generators

Particular resonant cavity

Folded cavity

372 16, 372 19, H01S 3081

Patent

active

045649499

ABSTRACT:
An improved folded cavity laser having particular application to holographic imaging is disclosed. The laser includes a lasing medium, such as for example a ruby rod, which is optically or electronically "pumped" in order to provide laser light. The medium includes first and second optical surfaces disposed at opposite ends of the lasing medium. A retro-reflecting roof mirror is disposed in optical alignment with the second optical surface of the lasing medium. A transverse mode selector is provided in optical alignment with the first surface of the lasing medium in order to surpress all transverse modes except those of a desired character. In the present embodiment, the transverse mode selector includes two apertures of approximately two millimeters diameter in order to obtain a laser output with a TEM.sub.00 mode. The use of a twin aperture transverse mode selector in conjunction with a retro-reflecting roof mirror provides at least twice the total cavity length and lasing medium than a conventional holographic pulsed laser, as well as two output beams which are in phase and coherent with each other. These beams may be directly used as an object and reference beam in a holographic system.

REFERENCES:
patent: 3447098 (1969-05-01), Eckberg
patent: 3904983 (1975-09-01), Moreno et al.
patent: 3995230 (1976-11-01), See

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