LD beam collimation based on aspheric cylindrical lens

Changwei Guo; Baoxing Xiong; Guiju Zhang; Qinfeng Xu; Jiawei Xu; Yufei Zhang; Kuaisheng Zou

doi:10.1117/12.2505722

16 January 2019 LD beam collimation based on aspheric cylindrical lens

Changwei Guo, Baoxing Xiong, Guiju Zhang, Qinfeng Xu, Jiawei Xu, Yufei Zhang, Kuaisheng Zou

Proceedings Volume 10838, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 1083817 (2019) https://doi.org/10.1117/12.2505722
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

A collimating system is designed by two orthogonal aspheric cylindrical lenses, which is used to collimate the the output beam of the Laser Diode (LD). The theory of light transmission is used to analyze the optical collimating system. The theoretical expressions are derived and the numerical results are obtained. The nonlinear Levenberg-Marquardt (LM) fitting algorithm based on the trust-region rule is applied to the surface shape evaluation. Residual analysis is used to test the rationality of the model hypothesis, and a simple analysis is made on the source of the error and the data optimization process. And the optical simulation of model optimization results is established. Simulation results show that the semidiverging angles of 20° and 9° for the fast and slow axes of semiconductor laser beam are both reduced to 0.05 mrad after passing the collimation system which is much better than that of a normal cylindrical lens collimating system 3 mrad. A uniform circular spot can be formed in the far field by adjusting the distance between the two aspheric lenses.

Citation Download Citation

Changwei Guo, Baoxing Xiong, Guiju Zhang, Qinfeng Xu, Jiawei Xu, Yufei Zhang, and Kuaisheng Zou "LD beam collimation based on aspheric cylindrical lens", Proc. SPIE 10838, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 1083817 (16 January 2019); https://doi.org/10.1117/12.2505722

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KEYWORDS

Collimation

Aspheric lenses

Data modeling

Error analysis

Mathematical modeling

Optimization (mathematics)

Cylindrical lenses

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