H - Electricity – 01 – S
Patent
H - Electricity
01
S
345/46
H01S 4/00 (2006.01)
Patent
CA 1042096
ABSTRACT OF THE DISCLOSURE The laser devices are energy-converting systems producing light output when pumped and comprise multi-layer thin film waveguide structures consisting of: - a passive thin film dielectric core slab having longitud- inally-distributed periodic diffracting structural modula- tion along at least end portions of its length for effect- ing reversal of propagation direction of a bound mode or modes; - a contiguous layer of active dielectric medium, i.e. a solid or fluid gain medium, the cladding thickness being of the order of at least 100 microns, disposed on either or both major surfaces of the core slab; - an optically-flat solid substrate supporting the core slab and maintaining the major surfaces thereof in precis- ely plane-parallel relation, which substrate may itself be an active gain medium. Incident pumping light, for example 3371 .ANG. wavelength coherent light output from a nitrogen laser is caused to irradiate the active medium, either penetrating its surface from the exterior, or the pumping light may be coupled into the thin film core by suitable means such as prisms, gratings, etc. as a guided mode for evanescent-wave component interaction with the cladding layer. Monochromatic output lasers have a core thickness chosen so that for a given dielectric constant differential with respect to the cladding layers a single mode propagates, and the mode-reversing structure is a first-order blazed reflection grating with blaze angle correlated to the boundary-reflection angle of the lasing mode for augmenting the proportion of reversed mode energy to zero-order diffracted energy. Plural-frequency output lasers employ first or higher order diffracting structure, obtaining inter- mode energy reversal, and intra-mode energy reversal.
221768
Hill Kenneth O.
Watanabe Akira
Hill Kenneth O.
Watanabe Akira
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