A beam-shaped study of the stable polarization VCSEL
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Stable-polarization VCSEL has gained an increasing attention in the field of target detection and laser medicine due to its compact size and relativity high beam quality. The VCSEL emitting stable-polarization uniform laser could, in particular, improve the accuracy of target detection. In this paper, a polarization control metal grating was processed on the top mirror of the VCSEL to inject carriers and select the polarization light. A diffractive optical element was processed on the substrate to shape the output beam. The design phase distribution of the DOE was based on G–S algorithm; as a result, an output power of 20 mW with a polarization ratio of 30:1 and a uniformity of 83.5% of the laser was obtained.
Funding was provided by National Natural Science Foundation of China (Grant no. 61805191).