Patent ID: 6647046
Filing Date: 2003-11-11
Classification: H01S

Abstract:
A semiconductor pump laser, comprising:an electro-optical ridge waveguide that converts a ridge injection current into light in an active layer having a material gin curve and integral front and rear facets arranged to reflect light back and forth in a resonant Fabry-Perot cavity through the active layer for lasing in a wide band of wavelengths, including a desired narrow lasing frequency band, within the material gain curve for providing a longitudinal modal operation of the pump laser; and a wavelength selective facet reflector integrated into one of the front and rear facets of the waveguide, the wavelength selective facet reflector comprising an anti-resonant etalon, the anti-resonant etalon stabilizing longitudinal modal operation of the pump laser to the desired narrow lasing frequency band, wherein the anti-resonant etalon having a thickness and other characteristics precisely controlled for maximizing reflectivity an minimizing transmission at the desired narrow lasing frequency band, anti-resonant etalon is optically coupled to the active layer to modify round-trip gain of the resonant cavity in the active layer, wherein the anti-resonant etalon is selected to enhance lasing in the desired narrow lasing frequency band by feeding-back reflectivity to increase the round-trip cavity gain and to suppress lasing at other wavelengths within the material gain curve by increasing the round-trip cavity loss outside of the desired narrow lasing frequency band.