Abstract A novel coupled multi-active-region large optical cavity structure cascaded by tunnel junction is proposed to solve the problems of catastrophic optical damage (COD) of facet and large vertical divergence caused by the thin emitting area in the conventional laser diode. For the laser with three active regions, a slope efficiency as high as 1.49 W/A, a vertical divergence angle of 17.4°, and a threshold current density of 271 A/cm2 are achieved. By optimizing the structure parameters, the beam quality is greatly improved, and the level of COD power increases more than two times compared with that of the conventional laser.
(Beam characteristics: profile, intensity, and power; spatial pattern formation)
Fund: Project supported by the State Key Development Program for Basic Research of China (Grant No. G20000863-02) and the Natural Science Foundation of Beijing, China (Grant No. 4032007).
Corresponding Authors:
Cui Bi-Feng
E-mail: cbf@bjut.edu.cn
Cite this article:
Cui Bi-Feng (崔碧峰), Guo Wei-Ling (郭伟玲), Du Xiao-Dong (杜晓东), Li Jian-Jun (李建军), Zou De-Shu (邹德恕), Shen Guang-Di (沈光地) Tunnel regenerated coupled multi-active-region large optical cavity laser with high quality beam 2012 Chin. Phys. B 21 094209
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