Coherent light generators – Particular beam control device – Tuning
Patent
1991-07-11
1993-06-01
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Tuning
372102, 372 96, 372 7, 385 37, H01S 310
Patent
active
052166805
ABSTRACT:
A guided-mode resonance filer is provided which can be used as an optical filter with very narrow line width and as an efficient optical switch. Diffraction efficiencies and passband frequencies are calculated based on guided-mode resonance properties of periodic dielectric structures in a waveguide geometry. The guided-mode resonance filter preferably includes means for changing various parameters within the grating so as to change passband frequencies in response thereto. Also, the present invention envisions a narrowband tuneable laser having a diffraction grating of the present invention placed within a laser cavity to provide narrowband optical wave output from the narrowband tuneable laser In another preferred embodiment, the present diffraction grating can be supported by a semiconductor substrate, preferably adjacent to a semiconductor laser for fine-tuning the output of the semiconductor laser. In still another preferred embodiment, the present diffraction grating can be placed between thin-film layers to enhance thin-film performance characteristics.
REFERENCES:
patent: 3868589 (1975-02-01), Wang
patent: 4328468 (1982-05-01), Krawczak et al.
patent: 4873692 (1989-10-01), Johnson et al.
patent: 5090017 (1992-02-01), Mendenhall et al.
Wang et al; "Guided-Mode Resonances in Planar Dielectric-Layer Diffraction Gratings"; J. Opt. Soc. Am A; vol. 7 No. 8 Aug. '1990.
Magnusson Robert
Wang Shu-Shaw
Board of Regents , The University of Texas System
Jr. Leon Scott
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