17 September 2013 Power scaling and beam divergence compression of bottom-emitting vertical-cavity surface-emitting lasers
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Proceedings Volume 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications; 89040D (2013) https://doi.org/10.1117/12.2032046
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China
Abstract
Power scaling and beam divergence compression of 980 nm bottom-emitting vertical-cavity surface-emitting lasers (VCSELs) are presented in this paper. First, the relationships among the reflectivity of the n-doped distributed Bragg reflector, threshold current, and output power were analyzed, and the n-DBR reflectivity was optimized to achieve higher slope efficiency in a relatively low threshold current. Second, the influence of the p-contact on the current density distribution inside the active region was analyzed using the three-dimensional finite-element method. Uniform current distribution was achieved by optimizing the diameter of the p-contact, and a consequent improvement in beam divergence was observed. A low divergence of 5.4° was obtained for a single device with continuous-wave (CW) of 1.46 W at room temperature. The 8×8 VCSEL array showed a divergence angle of 10.2° at 4A. This array afforded a CW output power of 1.95 W under an injected current of 4 A and a pulse output power of 115 W under a pulse drive current of 130 A, a pulse width of 100 ns, and a repetition frequency of 100 Hz. VCSEL array chips were packaged in series to form a “quasi-array” to further increase the output power. This series achieved a peak output power of 475 W under a pulse drive current of 120 A.
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Xing Zhang, Yongqiang Ning, Jianwei Zhang, Jian Zhang, Jinsheng Zhang, Peng Jia, Xiushan Li, Jingjing Shi, Li Qin, Yun Liu, Cunzhu Tong, Lijun Wang, "Power scaling and beam divergence compression of bottom-emitting vertical-cavity surface-emitting lasers", Proc. SPIE 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications, 89040D (17 September 2013); doi: 10.1117/12.2032046; https://doi.org/10.1117/12.2032046
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