Patent ID: 6249140
Filing Date: 2001-06-19
Classification: H01S

Abstract:
A method of screening semiconductor laser devices and selecting semiconductor laser devices having relatively long lifetimes, the method comprising:driving a plurality of semiconductor laser devices with a driving current having a first magnitude while repeatedly cycling the semiconductor laser devices between a first temperature and a second temperature, the first temperature being higher than the second temperature;discarding the semiconductor laser devices that fail while conducting the driving current of the first magnitude during cycling between the first and second temperatures;increasing the driving current to a second magnitude while repeatedly cycling the temperature of the semiconductor laser devices that have not failed between the first and second temperatures;discarding the semiconductor laser devices that fail while conducting the driving current of the second magnitude during cycling between the first and second temperatures; andmeasuring changes in threshold currents of the semiconductor laser devices as the driving current is further increased in magnitude during cycling between the first and second temperatures.