Cylindrical Vector Beams with an MOPA Amplifier Based on Nonlinear Polarization Rotation Mode-Locking

Tianyu Zhang; Dong Li; Siqi Pei; Yun Zhu; Jiapeng Hu; Xuesheng Liu; Anru Yan; Youqiang Liu; Zhiyong Wang

doi:10.3390/photonics11111013

Photonics (Oct 2024)

Cylindrical Vector Beams with an MOPA Amplifier Based on Nonlinear Polarization Rotation Mode-Locking

Tianyu Zhang,
Dong Li,
Siqi Pei,
Yun Zhu,
Jiapeng Hu,
Xuesheng Liu,
Anru Yan,
Youqiang Liu,
Zhiyong Wang

Affiliations

Tianyu Zhang: School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
Dong Li: AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China
Siqi Pei: School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
Yun Zhu: School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
Jiapeng Hu: School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
Xuesheng Liu: School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
Anru Yan: School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
Youqiang Liu: School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
Zhiyong Wang: School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China

DOI: https://doi.org/10.3390/photonics11111013
Journal volume & issue: Vol. 11, no. 11
p. 1013

Abstract

Read online

CVBs (cylindrical vector beams) are widely used in optical imaging, optical trapping, material processing, etc. In this study, based on mode-selective couplers and passive mode-locking fiber technology, a cylindrical vector fiber amplifier with an MOPA (master oscillator power amplifier) structure was developed. In the experiment, the pre-amp stage reached 19.87 mW output power and a CVB output with a mode purity greater than 97%. The measured beam quality factor was M2 = 2.1. The CVB output power obtained by the first-amp stage was 152.4 mW, and the mode purity was greater than 92%. The measured beam quality factor was M2 = 1.99. The internal inhomogeneity and external effects of the isotropic LMA (large-mode-area) fiber led to a decrease in beam quality and mode purity. After amplification, the gain of the fundamental mode was higher and the power was greater, resulting in a greatly reduced mode purity. This CVB fiber amplifier yielded important research value in expanding the applications of high-power fiber lasers.

Published in Photonics

ISSN: 2304-6732 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website: http://www.mdpi.com/journal/photonics

About the journal

Abstract

Keywords