Coherent light generators – Particular active media – Active media with particular shape
Patent
1986-12-01
1989-05-09
Davie, James W.
Coherent light generators
Particular active media
Active media with particular shape
372 92, 372 95, 372 99, 372108, 356350, H01S 306, H01S 316
Patent
active
048295370
ABSTRACT:
A nonstandard spherical resonator which produces laser radiation having spherical modes of oscillation is formed entirely within a sphere of laser gain material. The resonator is pumped to produce the spherical modes. By pumping an isotropically coated sphere at normal incidence the entire sphere forms the resonator, and the laser radiates uniformly in all directions as from a point source. By pumping obliquely to totally internally reflect the laser radiation at the surface of the sphere, or by applying an equatorial coating on the sphere to internally reflect the laser radiation, toroidal region within the sphere forms the resonator. The pumping volume can be controlled so that the laser radiation is single longitudinal mode and single frequency by limiting the active mode volume. Prisms can be used for input and output coupling to the toroidal resonator; and optical fiber can also be used for output coupling. A compact laser design uses a Nd:YAG sphere pumped by a laser diode. The spherical resonators can be used for traking, holography, levelling and ring laser gyroscope applications. The toroidal resonator forms an ideal ring laser for use as a gyroscope; a sphere with three orthongonal toroidal resonators provides three degree of freedom measurement capability.
REFERENCES:
patent: 3440561 (1969-04-01), Pole et al.
patent: 3538453 (1970-11-01), Miller
patent: 3967215 (1976-06-01), Bellak
patent: 4039260 (1977-08-01), Redman
Davie James W.
Davis Paul
Spectra-Physics Inc.
Vo Xuan T.
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