Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
December 15, 2009
Patent Application Number
12010028
Date Filed
January 18, 2008
Patent Primary Examiner
Patent abstract
A semiconductor laser device includes a coating film for adjustment in reflectance formed at a light-emitting portion of semiconductor, wherein the coating film has a thickness d set to satisfy R (d, n)>R (d, n+0.01) and d>λ/n, where n represents a refraction index of the coating film for a lasing wavelength λ, and R (d, n) represents a reflectance at the light-emitting portion depending on the thickness d and the refraction index n.
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