Coherent light generators – Particular active media
Reexamination Certificate
2007-07-10
2007-07-10
Harvey, Minsun Oh (Department: 2828)
Coherent light generators
Particular active media
C372S075000
Reexamination Certificate
active
10751282
ABSTRACT:
Lasing at the edge of the reflection band or at a defect state within the reflection band of a thin one-dimensional feedback structure is used to create a large-area, thin-film laser source with transverse dimensions that can be much greater than the film thickness. Angular confinement of radiation propagating perpendicular to the layers leads to a spreading of the beam inside the medium which is much greater than the diffraction divergence. This enhances the spatial extent of correlation at the output surface of the thin film. When a pump source induces gain at the lasing threshold in a wide region, a spatially coherent monochromatic light beam is emitted perpendicular to the film surface from the entire gain region. Alternate embodiments of the present invention include a passive spatial filter and an active amplifier.
REFERENCES:
patent: 6404789 (2002-06-01), Kopp et al.
Genack Azriel Zelig
Kopp Victor Il'ich
Zhang Zhao-Qing
Chiral Photonics, Inc.
Etkin, Esq. Edward
Harvey Minsun Oh
Nguyen Tuan N.
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