Generation of High-Quality Cylindrical Vector Beams from All-Few-Mode Fiber Laser

Pingping Xiao; Zhen Tang; Fei Wang; Yaqiong Lu; Zuxing Zhang

doi:10.3390/photonics11100975

Photonics (Oct 2024)

Generation of High-Quality Cylindrical Vector Beams from All-Few-Mode Fiber Laser

Pingping Xiao,
Zhen Tang,
Fei Wang,
Yaqiong Lu,
Zuxing Zhang

Affiliations

Pingping Xiao: Department of Electronic Information Engineering, College of Physics and Engineering Technology, Yichun University, Yichun 336000, China
Zhen Tang: College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Fei Wang: Department of Electronic Information Engineering, College of Physics and Engineering Technology, Yichun University, Yichun 336000, China
Yaqiong Lu: College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Zuxing Zhang: College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

DOI: https://doi.org/10.3390/photonics11100975
Journal volume & issue: Vol. 11, no. 10
p. 975

Abstract

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Transverse mode control of laser intracavity oscillation is crucial for generating high-purity cylindrical vector beams (CVBs). We utilized the mode conversion and mode selection properties of two-mode long-period fiber gratings (TM-LPFGs) and two-mode fiber Bragg gratings (TM-FBGs) to achieve intracavity hybrid-mode oscillations of LP01 and LP11 from an all-few-mode fiber laser. A mode-locked pulse output with a repetition rate of 12.46 MHz and a signal-to-noise ratio of 53 dB was achieved with a semiconductor saturable absorber mirror (SESAM) for mode-locking, at a wavelength of 1550.32 nm. The 30 dB spectrum bandwidth of the mode-locked pulse was 0.13 nm. Furthermore, a high-purity CVB containing radially polarized and azimuthally polarized LP11 modes was generated. The purity of the obtained CVB was greater than 99%. The high-purity CVB pulses have great potential for applications in optical tweezers, high-speed mode-division multiplexing communication, and more.

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

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