High-Mode Purity 1 μm Cylindrical Vector Beam All-Fiber Laser Based on a Symmetric Two-Mode Coupler

Boyi Yang; Siqi Pei; Tianyu Zhang; Yizhuo Zhang; He Hao; Kun Zhang; Xuesheng Liu; Tian Lan; Anru Yan; Youqiang Liu; Zhiyong Wang

doi:10.3390/app13116490

Applied Sciences (May 2023)

High-Mode Purity 1 μm Cylindrical Vector Beam All-Fiber Laser Based on a Symmetric Two-Mode Coupler

Boyi Yang,
Siqi Pei,
Tianyu Zhang,
Yizhuo Zhang,
He Hao,
Kun Zhang,
Xuesheng Liu,
Tian Lan,
Anru Yan,
Youqiang Liu,
Zhiyong Wang

Affiliations

Boyi Yang: Beijing Engineering Research Central of Laser Technology, Beijing University of Technology, Beijing 100124, China
Siqi Pei: Beijing Engineering Research Central of Laser Technology, Beijing University of Technology, Beijing 100124, China
Tianyu Zhang: Beijing Engineering Research Central of Laser Technology, Beijing University of Technology, Beijing 100124, China
Yizhuo Zhang: AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China
He Hao: AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China
Kun Zhang: Science and Technology on Solid-State Laser Laboratory, No. 11 Research Institute of China Electronics Technology Group Corporation, Beijing 100015, China
Xuesheng Liu: Beijing Engineering Research Central of Laser Technology, Beijing University of Technology, Beijing 100124, China
Tian Lan: Beijing Engineering Research Central of Laser Technology, Beijing University of Technology, Beijing 100124, China
Anru Yan: Beijing Engineering Research Central of Laser Technology, Beijing University of Technology, Beijing 100124, China
Youqiang Liu: Beijing Engineering Research Central of Laser Technology, Beijing University of Technology, Beijing 100124, China
Zhiyong Wang: Beijing Engineering Research Central of Laser Technology, Beijing University of Technology, Beijing 100124, China

DOI: https://doi.org/10.3390/app13116490
Journal volume & issue: Vol. 13, no. 11
p. 6490

Abstract

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Cylindrical vector beams (CVBs) are the product of polarization modulation of optical fields, and possess both unique focusing characteristics and excellent properties applicable to machining, imaging, communication and other fields. Mode selection couplers comprise a promising new method to realize the long-term stable output of cylindrical vector beam all-fiber lasers. Mode selection couplers have the advantages of a simple structure, high mode conversion efficiency and high mode purity. However, the production process of conventional asymmetric mode selection couplers is more complicated. Therefore, in this paper, a symmetric two-mode coupler with a 1 μm band is designed and fabricated using the finite element method, beam propagation method and fused pull-cone method, and a set of all-fiber passive mode-locked lasers based on symmetric dual-mode couplers are constructed. Finally, we obtain cylindrical vector beam outputs with central wavelengths of 1038.97 nm/1067.72 nm, a repetition rate of 8.78 MHz, pulse durations of 660 ps/656 ps, maximum average powers of 5.25 mW/5.2 mW, and the high mode purity of TM (transverse magnetic)01 mode and TE (transverse electric)01 mode is 97.18% and 97.07%, respectively.

Published in Applied Sciences

ISSN: 2076-3417 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General); Science: Biology (General); Science: Physics; Science: Chemistry
Website: http://www.mdpi.com/journal/applsci

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