• Chinese Optics Letters
  • Vol. 20, Issue 2, 021402 (2022)
Hanshuo Wu1, Jiangtao Xu2, Liangjin Huang1, Xianglong Zeng2, and Pu Zhou1、*
Author Affiliations
  • 1College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
  • 2Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China
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    Abstract

    A hundred-watt-level spatial mode switchable all-fiber laser is demonstrated based on a master oscillator power amplifier scheme. The performance of the amplifier with two seed lasers, i.e., with the acoustically induced fiber grating (AIFG) mode converter inside and outside the seed laser cavity, is investigated. Real-time mode switching with millisecond scale switching time between the LP01 and LP11 modes while operating in full power (>100 W) is realized through an AIFG driven by radio frequency modulation. This work could provide a good reference for realizing high-power agile mode switchable fiber lasers for practical applications.

    1. Introduction

    Fiber lasers have already found a wide variety of applications ranging from scientific research and medical treatment to industrial processing[18], owing to their outstanding characteristics of high-power capability, system simplicity, easy thermal management, etc.[6]. In recent years, fiber lasers with dynamic spatial mode profiles have attracted extra attention for their specific advantages in material processing. For instance, several companies have individually launched commercially available mode adjustable/switchable fiber lasers for industrial processing[911], the beam profiles of which could be adjusted according to the processing stages and application scenarios for improved processing quality.