Patent ID: 8124431
Filing Date: 2012-02-28
Classification: B82Y,H01S

Abstract:
1. A method of producing a nitride semiconductor laser device, comprising: forming a wafer including a nitride semiconductor layer of a first conductivity type, an active layer of a nitride semiconductor, a nitride semiconductor layer of a second conductivity type, and an electrode pad layer for the second conductivity type stacked in this order on a main surface of a conductive substrate, said wafer also including a plurality of stripe-like waveguide structures parallel to said active layer; forming first and second nitride semiconductor laser devices on said wafer by patterning the electrode pad layer to form a plurality of electrode pads; cutting said wafer to obtain individual first and second nitride semiconductor laser device chips, each of the first and second nitride semiconductor laser device chips including an electrode pad of the plurality of electrode pads and a stripe-like waveguide structure of the plurality of stripe-like waveguide structures; and distinguishing between said first and second nitride semiconductor laser device chips by automatic image recognition, wherein said first and second nitride semiconductor laser device chips differ from each other and are distinguished based on positions of said plurality of stripe-like waveguide structures with respect to a width direction of each of said first and second nitride semiconductor laser device chips and as to an area ratio of said electrode pad for the second conductivity type to said main surface of said conductive substrate for each of the first and second nitride semiconductor laser device chips.