Laser Diode Pumped Multiple Rod Ring Laser Allowing Combination of Multiple Pump Sources.
Patent, Filed 7 May 91, patented 17 Mar 92,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A diode pumped ring laser allows for the combination of more pumping mode radiation 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 Brewsters 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.
- Lasers and Masers