Monolithic, non-planar ring laser with Q-switched single-frequen

Details Monolithic, non-planar ring laser with Q-switched single-frequen Monolithic, non-planar ring laser with Q-switched single-frequen

1998-01-16

1999-12-14

Scott, Jr., Leon

Coherent light generators

Particular resonant cavity

Folded cavity

372 11, H01S 3083

Patent

active

060027045

ABSTRACT:
A monolithic, non-planar ring laser having Q-switched single-frequency operation comprises a diode laser as the pumping light source of which the pumping light is coupled to a ring laser crystal (2) that comprises at least three total reflection faces B, C and D and a dielectrically coated crystal face A designed as a coupling and decoupling mirror. To obtain high-power laser pulses in the highly stable single-frequency mode and further to achieve compactness, the following design solutions are offered: 1. A switching crystal (20) having an appropriate index of refraction which can be moved to a distance of about one laser beam wavelength to one of the total reflection faces B, C, D of the ring laser crystal (2) to decouple the evanescent wave field and thereby to suppress laser oscillation, said switching crystal being displaceable away from the total reflection face to generate laser pulses, 2. The ring laser crystal (2) is composed of a laser material having saturable losses at the lasing transition (lasing wavelength), 3. The ring laser crystal (30) consists of at least one active laser material crystal (32, 34) and of a further crystal (36) made of a saturable absorber material, 4. The ring laser crystal (2) is fitted at least on one surface with a saturable absorber-material layer (40), said layer preferably being deposited epitaxially, where the ring laser crystal, by means of a non-planar beam path, causes reciprocal rotation of the direction of polarization of the lasing light and by means of the Faraday effect in a permanent magnetic field (16) implements non-reciprocal rotation of the direction of polarization of the lasing light.

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