Oscillators – Molecular or particle resonant type
Patent
1975-09-25
1976-11-09
Sikes, William L.
Oscillators
Molecular or particle resonant type
330 43, H01S 316
Patent
active
039913864
ABSTRACT:
The disclosed distributed feedback laser employs an alkali halide crystal having a spatially modulated pattern of a stable color center and a complementary spatially modulated pattern of U-centers. The stability of the color centers is provided by initial additive coloration, conversion to U-centers, and subsequent reconversion; and the spatial modulation is provided by patterning the reconversion by exposing a portion of the crystal to an interference pattern of coherent light. Conversion occurs by two-photon absorption. The very large penetration depth and the use of ultraviolet frequencies that are only about one-half of the magnitude of the frequencies that would otherwise be required make this device and process attractive for thick holograms and for distributed feedback devices such as lasers.
REFERENCES:
mollenauer, et al., Broadly Tunable Lasers Using Color Centers, J. Appl. Phys., vol. 46, No. 7 (July 1975) pp. 3109-3118.
Mollenauer, et al., A Broadly Tunable CW Laser Using Color Centers, Appl. Phys. Lett., vol. 24, No. 8 (Apr. 15, 1974) pp. 386-388.
Fritz, et al., Laser Effect in KCl with F.sub.A (Li) Centers, Solid State Communications, vol. 3, No. 3 (1965) pp. 61-63.
Bjorklund Gary Carl
Mollenauer Linn Frederick
Bell Telephone Laboratories Incorporated
Sikes William L.
Wisner Wilford L.
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