In order to solve the problem of large vertical divergence angle of semiconductor laser and poor beam quality, the photonic crystal is introduced to realize mode extension and separation, which improves the properties of laser diode and realizes high brightness and high beam quality laser output. Photonic crystal working principle is theoretically analyzed and simulated as well, and some photonic crystal semiconductor lasers with different properties are introduced. Based on the photonic crystal semiconductor laser, some structures are integrated to get high power, low vertical divergence angle and high brightness output beam. Experimental results prove that the band gap effects of the photonic crystal improve the quality and brightness of laser beam, and break through the limitation of normal semiconductor, which help the semiconductor laser effectively used in the fiber laser pump and laser processing, and establish the foundations for the direct application of semiconductor laser.