Coherent light generators – Particular active media – Liquid
Patent
1992-02-04
1993-01-19
Scott, Jr., Leon
Coherent light generators
Particular active media
Liquid
372106, 372102, 372 32, 372 27, 372108, 372 56, 372 31, 372 20, H01S 320
Patent
active
051812223
ABSTRACT:
Laser apparatus is described in which the optical cavity of a laser oscillator is specially provided with a polarizing device which has on its outer face a partially reflecting coating (such as a thin partially reflecting layer of low-loss dielectric material). The polarizing device serves both as an output coupler for narrow linewidth laser emission from the optical cavity and also as a means for substantially suppressing amplified spontaneous emission (ASE). A multiple-prism Littrow-mounted grating (MPL) dye laser apparatus embodying the invention achieves a laser linewidth of less than about 0.1 GHz (.DELTA..nu.), a ratio of intensity I of the ASE to the intensity I.sub..lambda. of the desired laser emission of about 10.sup.-10, an efficiency of somewhat more than 10%, and a short optical cavity length of less than 10 cm. The apparatus is also more rugged, more stable in frequency with changes in temperature, and less costly than similar previous lasers.
REFERENCES:
patent: 4891817 (1990-01-01), Duarte
Duarte et al., "Narrow Linewidth High PRF Copper Laser-Pumped Dye-Laser Oscillators"; Applied Optics vol. 23, No. 9, May 1984.
"Flashlamp pumped narrow-linewidth dispersive dye laser oscillators: . . . instabilities" (Duarte et al.) Applied Optics, vol. 29, No. 21, Jul. 20, 1990, pp. 3176-3179.
"Repetitively Pulsed Tunable Dye Laser for High Resolution Spectroscopy", by T. W. Hansch, Applied Optics, vol. 11, No. 4, Apr., 1972, pp. 895-898.
"Transmission Efficiency in Achromatic Nonorthogonal Multiple-Prism Laser Beam Expanders" (Duarte, Optics Communications, vol. 71, No. 1.2, May 1, 1989, pp. 1-5.
Eastman Kodak Company
Jr. Leon Scott
Randall Robert L.
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