Coherent light generators – Particular beam control device – Q-switch
Patent
1990-11-29
1992-07-21
Lee, John D.
Coherent light generators
Particular beam control device
Q-switch
372 97, H01S 311
Patent
active
051329778
ABSTRACT:
A Q-switched laser having a gain medium disposed within a first cavity and a second cavity whose optical path length is adjustable such that the quality of the first resonant cavity is affected. One aspect of the invention is the changing of the physical path length of the second cavity so as to affect the reflectivity of a mirror common to both cavities as seen from the first cavity. Another aspect of the invention is the incorporation, within the second cavity, of a material whose refractive index or absorption coefficient can be varied by the application of an electric field, a magnetic field, a temperature change or an applied pressure.
REFERENCES:
patent: 3546620 (1970-12-01), Erickson et al.
patent: 4174504 (1979-11-01), Chenausky et al.
patent: 4982405 (1991-01-01), Zayhowski et al.
"Switching of a Laser Emission Spectrum by an External Optical Signal", Karpushko et al., Soviet J. of Quantum Elec.: vol. 9, No. 4, Apr. 1979, pp. 520-521.
"Dispositif Bistable A Laser He-Ne A Crital Liquide Dans La Cavite Couplee," Podoleanu et al., Optics Communications, vol. 54, No. 6, Jul. 15, 1985, pp. 358-362.
Mooradian Aram
Zayhowski John J.
Lee John D.
Massachusetts Institute of Technology
Wise Robert E.
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