• Chinese Optics Letters
  • Vol. 20, Issue 2, 021404 (2022)
Jinfang Yang1、2, Zhaohua Wang2、5, Jiajun Song2、3, Xianzhi Wang2、3, Renchong Lü1、2, Jiangfeng Zhu1, and Zhiyi Wei2、3、4、*
Author Affiliations
  • 1School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
  • 2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Songshan Lake Materials Laboratory, Dongguan 523808, China
  • 5CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
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    Abstract

    We report on a high-power diode-pumped Yb:KG(WO4)2 (Yb:KGW) mode-locked laser with a semiconductor saturable absorber mirror (SESAM). For 32.7 W of incident pump power, we generate 261 fs pulses with the maximum average output power of up to 13.0 W and spectrum centered around 1039 nm at 68.4 MHz, corresponding to 190 nJ of single pulse energy and 0.72 MW of peak power. The optical-to-optical conversion efficiency is 39.8%, and the slope efficiency is 64.4%. The Yb:KGW laser exhibits a power stability better than 0.543% of the root-mean-square in 2 h.

    1. Introduction

    In recent years, more efforts have been devoted to the research of ultrashort pulses with high average power for various applications such as pumping of optical parametric oscillators, material micromachining, multi-photon imaging, and terahertz applications[13]. At present, the Ti:sapphire laser is limited to output power below 4 W due to the lower pump power and the quantum efficiency of the crystal. In addition, its pump source is quite expensive. In contrast, the Yb3+-doped femtosecond laser has more great potential because it can be pumped by tens or even hundreds of watts laser diodes (LDs), and the center wavelength ranges from 0.9 µm to 1.1 µm. Despite there being many reports on Yb-doped lasers, the trade-off between the average power and pulse duration was still a challenging topic. Therefore, it is very crucial to choose a novel gain medium to meet a wide spectrum supporting the generation of shorter pulses and good thermo-mechanical properties allowing for high-power laser pumping.

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    Jinfang Yang, Zhaohua Wang, Jiajun Song, Xianzhi Wang, Renchong Lü, Jiangfeng Zhu, Zhiyi Wei. Diode-pumped 13 W Yb:KGW femtosecond laser[J]. Chinese Optics Letters, 2022, 20(2): 021404
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    Category: Lasers, Optical Amplifiers, and Laser Optics
    Received: Aug. 2, 2021
    Accepted: Aug. 31, 2021
    Published Online: Oct. 18, 2021
    The Author Email: Zhiyi Wei (zywei@iphy.ac.cn)