LASER DIODES COMPRISING QWI OUTPUT WINDOW AND WAVEGUIDE AREAS AND METHODS OF MANUFACTURE

摘要

A process of manufacturing a semiconductor laser diode comprising a gain section, a QWI output window, and QWI waveguide areas. The QWI waveguide areas are fabricated using quantum well intermixing and define a QWI waveguide portion in the QWI output window of the laser diode. The QWI output window is transparent to the lasing wavelength lambdaL. The QWI waveguide portion in the QWI output window is characterized by an energy bandgap that is larger than an energy bandgap of the gain section such that the band gap wavelength lambdaQWI in the QWI waveguide portion and the QWI output window is shorter than the lasing wavelength lambdaL. The QWI output window is characterized by a photoluminescent wavelength APL. The manufacturing process comprises a lambdaPL screening protocol that determines laser diode reliability based on a comparison of the lasing wavelength lambdaL and the photo luminescent wavelength lambdaPL of the QWI output window.