Study On The Beam Characteristics Of Vertical-Cavity Surface-Emitting Laser

Vetical cavity surface emitting laser as a new structure of the semiconductor laser, have many advantages, including surface light output, easy to two-dimensional integration, circularly symmetric beam, and high fiber coupling efficiency, and low power consumption, long life and other advantages. VCSEL have been widely used in optical interconnections, optical communicaitons and large-scale laser display and other aspects.This paper delicately described the basic of VCSEL and the beam quality factor of device. As the traditional VCSEL circular electrode structure had the problems such as the uneven of current injection and poor beam quality, this paper we presented a new designed method VCSEL electrode structure, namely radiation electrode VCSEL, thereby improved the uniformity of the current injection and laser beam quality. Experimental, we prepared red VCSEL using the process for preparing a semiconductor device, and we tested the beam characteristics of this new electrode structure VCSEL, the results showed that this desighed approach significantly improved the beam quality of VCSEL device.In order to further develop the VCSEL array were easy to the advantages of integrateing two-dimensional, this paper prepared two-dimensional array of red VCSEL devices by the centre of symmetrical, and we overall received a higher power output level of the laser on the experiment.