US Patent 11183814 Surface-emmiting laser comprising surface gratings
Patent 11183814 was granted and assigned to Huazhong University of Science and Technology on November, 2021 by the United States Patent and Trademark Office.
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A surface-emitting laser, which is a ridge waveguide structure, including: a substrate, a first cladding layer, an active layer, a conductive layer, a second cladding layer; the Bragg gratings is etched on the surface of the ridge waveguide; the two upper electrodes are disposed on both sides of the ridge waveguide; two grooves are formed between the ridge waveguide and each of the two upper electrodes; the first waveguide cladding layer includes one or more current confinement regions; or a buried tunnel junction is formed in the second cladding layer for limiting current. The Bragg gratings comprise two first-order gratings and one second-order grating placed between two first-order gratings.
US Patent 11183814 Surface-emmiting laser comprising surface gratings
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