Coherent light generators – Particular active media – Insulating crystal
Patent
1990-02-21
1991-08-06
Gonzalez, Frank
Coherent light generators
Particular active media
Insulating crystal
372 68, H01S 316
Patent
active
050383531
ABSTRACT:
A laser system employing thulium and holmium in a trivalent state. The quantum levels of interest in the thulium and holmium are coupled so that one pumping photo absorbed by the thulium results in two photons emitted by the holmium, making for an unusually efficient laser system. The lower level is sufficiently depopulated at room temperature to allow laser operation without cryogenics. In preferred embodiments, the laser pump can be a laser diode, itself especially efficient, and whose output frequency is closely matched in photon energy to the thulium quantum state of interest, thus lending additional efficiency to the overall system. The thulium and the holmium exist in an yttrium-aluminum garnet crystal as lattice replacements for yttrium.
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Allen Roger E.
Esterowitz Leon
Kintz Gregory J.
Gonzalez Frank
McDonnell Thomas E.
Miles Edward F.
The United States of America as represented by the Secretary of
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