The semiconductor laser is bag power laser and it wavelength is 808nm。it has great many characteristics that high power, conversion ratio of Photoelectricity is high, strongly reliability, long server time, low cost .
To understand incentive mode is best way that learning the theory of semiconductor laser。the two parallel plane mirrors formed from the cleavage facets of semiconductor, use the parallel plane mirrors as reflector. and use the mechanism of direct interband transition of semiconductor ,they formed resonant cavity . These conditions do obtain after resonant cavity is set up. then optical oscillation and feedback.

Finally they produces light radiation amplification and output laser.