• Advanced Photonics
  • Vol. 4, Issue 5, 056001 (2022)
Jinhai Zou1、2, Jinfen Hong1、2, Zhuang Zhao3, Qingyuan Li1, Qiujun Ruan1, Hang Wang1, Yikun Bu1、*, Xianchao Guan3, Min Zhou3, Zhiyong Feng3, and Zhengqian Luo1、2、4、*
Author Affiliations
  • 1Xiamen University, School of Electronic Science and Engineering, Fujian Key Laboratory of Ultrafast Laser Technology and Applications, Xiamen, China
  • 2Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen, China
  • 3Huawei Technologies Co., Ltd., Shenzhen, China
  • 4Xiamen University, Shenzhen Research Institute, Shenzhen, China
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    DOI: 10.1117/1.AP.4.5.056001 Cite this Article
    Jinhai Zou, Jinfen Hong, Zhuang Zhao, Qingyuan Li, Qiujun Ruan, Hang Wang, Yikun Bu, Xianchao Guan, Min Zhou, Zhiyong Feng, Zhengqian Luo. 3.6 W compact all-fiber Pr3+-doped green laser at 521 nm[J]. Advanced Photonics, 2022, 4(5): 056001 Copy Citation Text show less

    Abstract

    Green semiconductor lasers are still undeveloped, so high-power green lasers have heavily relied on nonlinear frequency conversion of near-infrared lasers, precluding compact and low-cost green laser systems. Here, we report the first Watt-level all-fiber CW Pr3 + -doped laser operating directly in the green spectral region, addressing the aforementioned difficulties. The compact all-fiber laser consists of a double-clad Pr3 + -doped fluoride fiber, two homemade fiber dichroic mirrors at visible wavelengths, and a 443-nm fiber-pigtailed pump source. Benefitting from > 10 MW / cm2 high damage intensity of our designed fiber dielectric mirror, the green laser can stably deliver 3.62-W of continuous-wave power at ∼ 521 nm with a slope efficiency of 20.9%. To the best of our knowledge, this is the largest output power directly from green fiber lasers, which is one order higher than previously reported. Moreover, these green all-fiber laser designs are optimized by using experiments and numerical simulations. Numerical results are in excellent agreement with our experimental results and show that the optimal gain fiber length, output mirror reflectivity, and doping level should be considered to obtain higher power and efficiency. This work may pave a path toward compact high-power green all-fiber lasers for applications in biomedicine, laser display, underwater detection, and spectroscopy.

    1 Introduction

    Green lasers are of great interest in biomedicine, laser display, spectroscopy, underwater optical communications, and scientific research.1 In contrast to the well-developed red or blue laser diodes (LDs), LDs emitting directly in the green region are still under development and hence the “green gap” exists.2 Currently, the leading technology for producing high-power continuous-wave (CW) green lasers is still the nonlinear frequency conversion (e.g., frequency doubling) of near-infrared solid-state or fiber laser systems,3,4 and the compactness, stabilization, and expenditure are still challenges. As a result, researchers are always looking for an alternate green-light laser solution that has the benefits of great brightness, compactness, and cost-effectiveness. Due to intrinsic advantages, such as good beam quality, small footprint, user-friendliness, and low- to no-maintenance, green fiber lasers doped with trivalent rare-earthions (e.g., Pr3+,5Ho3+,6Er3+7) can satisfy these demands and bridge the “green gap,” so there is a huge drive to develop compact high-power rare-earth-doped fiber lasers in the green spectral region.

    Jinhai Zou, Jinfen Hong, Zhuang Zhao, Qingyuan Li, Qiujun Ruan, Hang Wang, Yikun Bu, Xianchao Guan, Min Zhou, Zhiyong Feng, Zhengqian Luo. 3.6 W compact all-fiber Pr3+-doped green laser at 521 nm[J]. Advanced Photonics, 2022, 4(5): 056001
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