Patent ID: 7194013

Claim:
A GaN-based semiconductor laser device comprising: in one laser chip, an insulating substrate, a first striped structure on said insulating substrate and having a first relaxation oscillation frequency fr 1 , and a second striped structure on said insulating substrate and having a second relaxation oscillation frequency fr 2 , wherein a length of said first striped structure is less than a length of said second striped structure, and an average of a front-face reflectance and a back-face reflectance of said first striped structure is greater than an average of a front-face reflectance and a back-face reflectance of said second striped structure, such that the first relaxation oscillation frequency fr 1 is greater than the second relaxation oscillation frequency fr 2 , and wherein a trench is between said first striped structure and said second striped structure, with said insulating substrate being exposed at a bottom of said trench such that a current path between said first striped structure and said second striped structure does not exist.