Coherent light generators – Particular resonant cavity – Folded cavity
Patent
1991-05-07
1992-03-17
Davie, James W.
Coherent light generators
Particular resonant cavity
Folded cavity
372 22, 372 75, H01S 3083
Patent
active
050974777
ABSTRACT:
A diode pumped ring laser allows for the combination of more pumping mode diation from pumping laser diodes for pumping at least one gain element which is simultaneously end pumped in two longitudinal resonator axes that intersect in a focused waist at a bounce point. Each gain element and associated mirrors are disposed to direct a hemispherical shaped resonator mode to a focus (waist) in each gain element where the resonator mode is reflected from the waist and diverges away to thereby form two cone-shaped active volumes in each gain element. Locating and orienting pumping diodes to longitudinally end pump the resonator modes with their pumping radiation to have a nearly perfect overlap of the resonator mode throughout the length of the active volumes in each gain element assures a more efficient, higher power end pumping of the gain elements. Appropriately arranging gain elements and mirrors directs pumping mode radiation to enter an exterior face and leave through an interior face of each gain element. Resonator mode radiation enters and leaves through the interior face of each gain element at a large enough angle, such as the Brewster's angle, which, in addition to allowing the pumping of both active volumes within each gain element rod, also provides for a high degree of linear polarization of the resonant mode and promotes stable unidirectional operation of the ring laser.
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Davie James W.
Fendelman Harvey
Keough Thomas Glenn
The United States of America as represented by the Secretary of
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