Theoretical explanation of the polarization-converting system achieved by beam shaping and combination technique and its performance under high power conditions

Peng Wang; Xiao Li; YaPing Shang; XiaoJun Xu

doi:10.1117/12.2201130

15 October 2015 Theoretical explanation of the polarization-converting system achieved by beam shaping and combination technique and its performance under high power conditions

Peng Wang, Xiao Li, YaPing Shang, XiaoJun Xu

Author Affiliations +

Proceedings Volume 9671, AOPC 2015: Advances in Laser Technology and Applications; 96711H (2015) https://doi.org/10.1117/12.2201130
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

The fiber laser has very obvious advantages and broad applications in remote welding, 3D cutting and national defense compared with the traditional solid laser. But influenced by heat effect of gain medium, nonlinear effect, stress birefringence effect and other negative factors, it’s very difficult to get high power linearly polarized laser just using a single laser. For these limitations a polarization-converting system is designed using beam shaping and combination technique which is able to transform naturally polarized laser to linearly polarized laser at real time to resolve difficulties of generating high-power linearly polarized laser from fiber lasers in this paper. The principle of the Gaussian beam changing into the hollow beam passing through two axicons and the combination of the Gaussian beam and the hollow beam is discussed. In the experimental verification the energy conversion efficiency reached 93.1% with a remarkable enhancement of the extinction ratio from 3% to 98% benefited from the high conversion efficiency of axicons and the system worked fine under high power conditions. The system also kept excellent far field divergence. The experiment phenomenon also agreed with the simulation quite well. The experiment proves that this polarization-converting system will not affect laser structure which controls easily and needs no feedback and controlling system with stable and reliable properties at the same time. It can absolutely be applied to the polarization-conversion of high power laser.

Citation Download Citation

Peng Wang, Xiao Li, YaPing Shang, and XiaoJun Xu "Theoretical explanation of the polarization-converting system achieved by beam shaping and combination technique and its performance under high power conditions", Proc. SPIE 9671, AOPC 2015: Advances in Laser Technology and Applications, 96711H (15 October 2015); https://doi.org/10.1117/12.2201130

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KEYWORDS

Axicons

Gaussian beams

Fiber lasers

High power lasers

Mirrors

Beam shaping

Laser applications

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