Antireflection coatings for injection lasers
AssigneeInternational Standard Electric Corporation
InventorGeorge H. B. Thompson
Life of this patent
Estimating the term…
Abstract
Antireflection dielectric coatings on the output face of an injection laser provide a negative electric vector amplitude reflection coefficient which increases the obtainable power output. Like coatings are applied to the opposite reflective face. The output layers are preferably three quarter-wavelength coatings of titania, silica and titania. The opposite reflective layers are two quarter-wavelength coatings of titania and silica and an outer metallic layer of aluminum. Silicon monoxide can also be used in place of titania.
Claims7
A semiconductor injection laser comprising a semiconductor body having an active region and optical reflective facets at opposite ends, one of said ends being a light emitting output end, means applying an energizing voltage to said laser, and an optical interference antireflective dielectric coating on said output end facet having a negative electric vector amplitude reflection coefficient and including an odd number of alternately high and low refractive index quarter-wavelength thickness layers.
Dependencies are inferred from the claim text.