为了获得高功率的偏振激光，对矩形结构的980 nm大口径顶发射垂直腔面发射激光器（VCSEL）进行了研究。实验结果显示，对于400 μm×80 μm出光口径的矩形VCSEL器件，在工作电流内，水平偏振光和竖直偏振光共同存在，并且水平偏振光一直占据主导地位；而且水平偏振光的光谱相对于竖直偏振光有蓝移。这些现象和理论模型的分析结果非常吻合，证明矩形结构能很好的稳定大口径VCSEL的偏振方向。最后测得矩形VCSEL在水平方向和竖直方向的远场发散角分别为6.9°和10.2°。

Polarization characteristics of 980 nm largeaperture topemitting verticalcavity surfaceemitting lasers (VCSEL) with rectangular post were investigated for achieving highpower polarized laser. The experimental results showed that, for the rectangularshaped VCSEL with 400 μm×80 μm output aperture, both Hpolarization (horizontal) and Vpolarization (vertical) coexisted in the entire range of operation current, and Hpolarization always dominated over Vpolarization. Blueshift of Hpolarization light occurred with respect to Vpolarization. The experimental results for power and spectrum polarization are consistent with the theoretical calculation. It was proved that the polarization direction of largeaperture VCSEL can be preferably stabilized by the rectangular structure. The horizontal and vertical beam divergences were 6.9° and 10.2° in the rectangularshaped VCSEL, respectively.