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Plasmonic metafiber for all-fiber Q-switched cylindrical vector lasers

Authors :
Hua He
Zeng Chao
He Zhiwen
Lu Hua
Du Yueqing
Mao Dong
Zhao Jianlin
Source :
Nanophotonics, Vol 12, Iss 4, Pp 725-735 (2023)
Publication Year :
2023
Publisher :
De Gruyter, 2023.

Abstract

Metafibers, by integrating metasurface at the optical fiber tip, are emerging as the significant optical coupling platforms for nanophotonics and fiber-optic communities. Here, we propose a plasmonic metafiber for converting the fundamental mode to first-order mode in fiber, and as proof of device performance, demonstrate an all-fiber Q-switched cylindrical vector laser using the metafiber. Based on polarization-dependent plasmonic resonance, a polarization-independent mode conversion metasurface is designed theoretically and numerically, fabricated directly on fiber facet, and packaged as an all-fiber component with efficiency up to 21% at 1550-nm band. Using the metafiber in an all-fiber laser, Q-switched azimuthally polarized beam (APB) and radially polarized beam (RPB) are delivered at wavelength of 1548.5 nm with pulse durations from ∼7 to ∼2 μs when pump power increases from 30 to 120 mW. The mode purities of the APB and RPB are 86.5% and 90.7%, respectively. This work outlines a new strategy to integrate metasurfaces into “all-in-fiber” systems and offers a reliable route to construct next-generation laser sources, such as all-fiber ultrafast structured lasers.

Details

Language :
English
ISSN :
21928614
Volume :
12
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Nanophotonics
Publication Type :
Academic Journal
Accession number :
edsdoj.065aa234ee243808e13797568435613
Document Type :
article
Full Text :
https://doi.org/10.1515/nanoph-2022-0696