Coherent light generators – Particular beam control device – Mode locking
Patent
1992-08-05
1993-12-14
Epps, Georgia Y.
Coherent light generators
Particular beam control device
Mode locking
372 13, 372 20, 372 41, 372 42, 372 69, 372 70, H01S 309, H01S 3098
Patent
active
052710254
ABSTRACT:
A laser source which operated under the principals of cooperative unconversion produces controllable optical pulses at wavelengths which are shorter than the wavelength of the laser energy which pumps the gain medium. The source is a solid-state laser which employs a five percent Er:LiYF.sub.4 crystal which is arranged in an astigmatically-compensated 3-mirror cavity. Pumping is achieved at 1.5 microns in the infrared, and the system operates in a continuous-wave, mode-locked fashion in the green spectral region at approximately 544 nm. The cooperative inversion mechanism involves energy pooling by trios of excited rare earth dopant ions in the laser medium. Q-switching is achieved with the use of intracavity amplitude modulation so as to achieve three-fold upconversion. A 3-mirror astigmatically-compensated cavity with the gain medium permits modulation of losses in a manner which cannot be achieved with known systems and achieves high stability.
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Epps Georgia Y.
University of Michigan
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