Coherent light generators – Particular active media – Insulating crystal
Patent
1988-08-23
1990-11-27
Scott, Jr., Leon
Coherent light generators
Particular active media
Insulating crystal
372 71, 372 75, H01S 316
Patent
active
049742302
ABSTRACT:
A Ho:YLF crystal including Tm as sensitizers for the activator Ho, is optically pumped with a semiconductor diode laser array to generate 2.1 .mu.m radiation with a pump power to output power of efficiency as high as 68%. The prior-art dual sensitizer system of Er and Tm requires cooling, such as by LN.sub.2, but by using Tm alone and decreasing the concentrations of Tm and Ho, and decreasing the length of the laser rod to about 1 cm, it has been demonstrated that laser operation can be obtained from a temperature of 77.degree. K. with an efficiency as high as 68% up to ambient room temperature with an efficiency at that temperature as high as 9%.
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Jones Thomas H.
Jr. Leon Scott
Manning John R.
The United States of America as represented by the Administrator
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