Coherent light generators – Particular active media – Insulating crystal
Patent
1988-02-01
1989-07-11
Sikes, William L.
Coherent light generators
Particular active media
Insulating crystal
372 6, 350 963, 350 9634, H01S 316
Patent
active
048478431
ABSTRACT:
Optical fibres comprised of a halide glass incorporating color centers, for example fluoride fibres, can behave as a laser or an amplifier when maintained at a low temperature, typically 77.degree. K., and optically pumped. A laser may be comprised by a length of such a fibre (1) wound on a spool (2) and disposed in liquid nitrogen (4), the ends of the fibre are outside of the coolant and associated with input and output mirrors (5,6) which define the extremities of a lasing cavity. An optical pumping signal (7) is provided by a laser (8), for example a Krypton ion laser operating in the visible range. The output of the fibre laser is in the infra-red. Higher gain than with conventional color center lasers is achieved due to the longer interaction length and cooling problems are overcome.
REFERENCES:
patent: 4618211 (1986-10-01), Fleury
Recent Progress in Color Center Lasers, W. Gellerman et al., Laser Focus, vol. 18 (1982) Apr., pp. 71-75.
Low-OH-Absorption Fluoride Glass Infra-Red Optical Fibres, G. Maze et al., Electronics Letters 20 (1984) Oct., No. 2, pp. 884-885.
Infrared Fibres-an overview, B. Bendow et al., Optical Engineering 24 (1985) Nov.-Dec., No. 6, pp. 1072.1080.
Byron Kevin C.
Scott Michael G.
Sibbett Wilson
Holloway B. R. R.
Sikes William L.
STC PLC
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