摘要：Conventional test of the peak wavelength of a laser used to be applied immediately after a device is injected current.
However, the results can not be considered as an accurate description to
temperature characteristic. This passage puts forward a concept of relaxation time in wavelength texts, mainly based on the experiment of 940 nm strain
quantum well laser, confirming that under constant current, wavelength will get
through a process of rising, and then, reach the limit. This process brings the effect on spectral
characteristics of a device which cannot be ignored and the accumulated heat in relaxation
time will gradually impact the emission wavelength of the laser, even crest
split to form bimodal phenomenon.
关键词：Semiconductor Laser; Test; Temperature Characteristics; Relaxation Time
