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US 4,731,789 AGranted
Clad superlattice semiconductor laser
AssigneeXerox Corporation
InventorRobert L. Thornton
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AssigneeXerox Corporation
InventorRobert L. Thornton
Estimating the term…
A clad superlattice semiconductor laser is fabricated utilizing Impurity Induced Disordering (IID) techniques that provides (1) reduction of free carrier absorption in the optical cavity and (2) the ability to selectively vary the amount of index guiding in the optical waveguide independent of the properties of the electron confining multiquantum well structure. The clad superlattice semiconductor laser provides for the novel inclusion of a superlattice in a cladding layer or region of the laser structure. An effective index waveguide can be realized by selectively disordering the cladding superlattice in regions adjacent to the formed index guide type optical cavity, as long as the superlattice is designed so that the established optical mode significantly overlaps with the disordered superlattice cladding regions, i.e., the evanescent wave propagating in the laser cavity overlaps into regions of the disordered superlattice.
In a clad superlattice semiconductor laser comprising a plurality of planar semiconductor layers, one or more of said layers forming an active region for light wave generation and propagation under lasing conditions in a confined optical cavity which includes said active region, a cladding layer formed on opposite sides of said active region, a superlattice formed as part of at least one of said cladding layers and comprising alternating layers of wells and barriers, the improvement comprising
In a clad superlattice semiconductor laser comprising a plurality of planar semiconductor layers, one or more of said layers forming an active region for light wave generation and propagation under lasing conditions in a confined optical cavity which includes said active region, a cladding layer formed on opposite sides of said active region, a superlattice formed as part of at least one of said cladding layers and comprising alternating layers of wells and barriers, the improvement comprising
Dependencies are inferred from the claim text.