Off-axis coherently pumped laser

Details Off-axis coherently pumped laser Off-axis coherently pumped laser

1980-10-23

1984-05-01

Davie, James W.

Coherent light generators

Long wavelength

372 71, 372 93, 372 95, 372103, H01S 305, H01S 308, H01S 3094

Patent

active

044465564

ABSTRACT:
Disclosed is a coherently optically pumped laser system wherein a pump laser beam (30) propagates through a laser medium contained in a degenerate cavity resonator (10) in a controlled multiple round trip fashion in such a way that the unused pump beam (30') emerges from an injection aperture (24) at a different angle (.beta.) from which it enters (.alpha.) the resonator. The pump beam (30) is angularly injected off of the central axis (22) of the resonator body (10) whereupon the pump beam alternately undergoes spreading and focusing (b.sub.1 . . . b.sub.8) while pumping the laser medium by a process of resonant absorption pumping. Means (32) are employed externally of the cavity resonator to sense the emergent output beam (30') which is used not only for alignment of the system but also to monitor the power of the emergent pump beam. The power in the emergent pump beam (30') provides a measure of the performance of the laser systems. The emergent output beam (30') thus is not fed back along the same path as the incident pump beam (30), thereby eliminating feedback to the pump beam source (28). The emergent pump beam (30') can also be used as a second pump beam source (30") by being reinjected back into the cavity or it can be used for pumping another laser (50).

REFERENCES:
patent: 3503671 (1970-03-01), Kompfner
patent: 3928816 (1975-12-01), Hartwick et al.
patent: 3996527 (1976-12-01), Hernqvist
Koepf et al, "Design Criteria for FIR Waveguide Laser Cavities", IEEE J. of Quantum Electronics, vol. QE-13, No. 6, Jun. 1977, pp. 418-421.

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