Wavelength-switchable cylindrical vector fiber laser based on symmetrical two-mode coupler

PEI Siqi; ZHANG Tianyu; ZHANG Kun; YANG Boyi; ZHU Yun; HU Jiapeng; LIU Xuesheng; LIU Youqiang; WANG Zhiyong

doi:10.37188/OPE.20233123.3395

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Wavelength-switchable cylindrical vector fiber laser based on symmetrical two-mode coupler

Modern Applied Optics | 更新时间：2023-12-13

- Wavelength-switchable cylindrical vector fiber laser based on symmetrical two-mode coupler
- Optics and Precision Engineering Vol. 31, Issue 23, Pages: 3395-3404(2023)
- 作者机构：
  
  1.北京工业大学北京市激光应用技术工程技术研究中心，北京 100124
  2.北京工业大学跨尺度激光成型制造技术教育部重点实验室，北京 100124
  3.北京工业大学激光工程研究院半导体光电先进技术研究所，北京 100124
  4.中国电子科技集团公司第十一研究院固体激光科学技术实验室，北京 100015
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20233123.3395
  CLC：
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裴思琪,张天宇,张昆等.基于对称双模耦合器的波长可切换柱矢量光纤激光器[J].光学精密工程,2023,31(23):3395-3404.

PEI Siqi,ZHANG Tianyu,ZHANG Kun,et al.Wavelength-switchable cylindrical vector fiber laser based on symmetrical two-mode coupler[J].Optics and Precision Engineering,2023,31(23):3395-3404.
裴思琪,张天宇,张昆等.基于对称双模耦合器的波长可切换柱矢量光纤激光器[J].光学精密工程,2023,31(23):3395-3404. DOI： 10.37188/OPE.20233123.3395.

PEI Siqi,ZHANG Tianyu,ZHANG Kun,et al.Wavelength-switchable cylindrical vector fiber laser based on symmetrical two-mode coupler[J].Optics and Precision Engineering,2023,31(23):3395-3404. DOI： 10.37188/OPE.20233123.3395.

摘要

为了实现高纯度脉冲柱矢量光的输出，提出并搭建基于对称双模耦合器的波长可切换的被动锁模柱矢量全光纤激光器。根据光纤传输原理得到基模向高阶模转换的折射率匹配直径，运用模式耦合模理论及光束传播法模拟分析了对称双模耦合器的结构参数对模式选择及耦合特性的影响，采用熔融拉锥法并免去传统的模式选择耦合器制作上的预拉锥工艺制作了对称双模耦合器，通过搭建一套被动锁模柱矢量全光纤激光器实现了中心波长1 039 nm和1 068 nm可切换、脉冲时间间隔为113.8 ns、重频为8.78 MHz、脉宽660 ps/656 ps、最大输出平均功率为5.25 mW/5.2 mW、模式纯度大于97%的柱矢量光输出。实验验证了对称双模耦合器的可行性，为后续高纯度柱矢量光的获得提供一种可行的方案。

Abstract

To obtain high-purity cylindrical vector beam pulses， a wavelength-switchable passive mode-locked cylindrical vector beams all-fiber laser is proposed and constructed based on a symmetrical two-mode coupler. First， the refractive index matching diameter for the conversion from the fundamental mode to the higher-order mode was obtained based on the principles of fiber optic transmission. The influence exerted by the structural parameters of the symmetrical two-mode coupler on mode selection and coupling characteristics was analyzed， employing simulations of mode coupling theory and the beam propagation method. The symmetrical double-mode coupler was fabricated utilizing the fusion tapering method. This method eliminates the complicated pre-taper process commonly employed in traditional mode selection coupler production. Finally， a passive mode-locked all-fiber laser， based on the symmetrical two-mode coupler， was constructed. This laser showcases a switchable central wavelength of 1 039 nm and 1 068 nm， pulse repetition interval of 113.8 ns， repetition rate of 8.78 MHz， pulse durations of 660 ps/656 ps， and maximum output average power of 5.25 mW/5.2 mW. In addition， it achieves a mode purity of over 97% for the vector beam output. The conducted experiments validate the feasibility of the symmetrical two-mode coupler and present a viable solution for obtaining high-purity cylindrical vector beams in future applications.

关键词

光纤激光器对称双模耦合器非线性偏振旋转锁模柱矢量光高纯度

Keywords

fiber lasersymmetric two-mode couplernonlinear polarization rotation principle mode-lockedcylindrical vector beamshigh mode purity

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