光子学报 ›› 2020, Vol. 49 ›› Issue (10): 1014001-1014001.doi: 10.3788/gzxb20204910.1014001

• 激光与激光光学 • 上一篇    下一篇

蓝光离轴泵浦Pr:YLF激光器及其高阶横模特性实验研究

张锋宸(), 惠沉林, 舒启鹤, 黄彩虹, 龚冬梅, 庄凤江()   

  1. 华侨大学 信息科学与工程学院,福建 厦门 361021
  • 收稿日期:2020-06-16 接受日期:2020-08-06 出版日期:2020-10-25 发布日期:2020-10-13
  • 通讯作者: 庄凤江 E-mail:zfchen0212@163.com;fjzhuang@gmail.com
  • 作者简介:张锋宸(1997-),男,硕士研究生,主要研究方向为固体激光技术及其应用等. Email: zfchen0212@163.com|庄凤江(1986-),男,副教授,博士,主要研究方向为全固态激光及超快激光技术等. Email: fjzhuang@gmail.com
  • 基金资助:
    国家自然科学基金(61505058)

Experimental Investigation on High-order Transverse-mode of the Pr:YLF Laser by a Blue Laser-diode Off-axis Pumping

Feng-chen ZHANG(), Chen-lin HUI, Qi-he SHU, Cai-hong HUANG, Dong-mei GONG, Feng-jiang ZHUANG()   

  1. College of Information Science and Engineering,Huaqiao University,Xiamen,Fujian 361021,China
  • Received:2020-06-16 Accepted:2020-08-06 Online:2020-10-25 Published:2020-10-13
  • Contact: Feng-jiang ZHUANG E-mail:zfchen0212@163.com;fjzhuang@gmail.com
  • Supported by:
    National Natural Science Foundation of China(61505058)

摘要:

采用蓝光二极管(LD)离轴泵浦Pr:YLF晶体和谐振腔调控,开展了直接输出720 nm激光的空心光束和高阶横模特性的理论和实验研究.基于高阶厄米-高斯光束(HG)光强特征理论,数值模拟了厄米-高斯光束(HG)与拉盖尔-高斯光束(LG)之间的模态转换特性.实验中,采用442 nm蓝光LD作为激光泵浦源,在紧凑的平凹谐振腔内使激光起振.通过LD离轴泵浦Pr:YLF晶体和谐振腔调节手段,直接获得空心和高阶HG模式的720 nm激光输出.同时,理论分析了HG模式相干叠加产生不同空间模态的光强分布,实验结果证实高阶HG光束与理论计算基本一致.本文方法在粒子操控、光学微加工和光通信等领域具有潜在应用价值.

关键词: Pr:YLF激光器, 可见光波, 蓝光泵浦, 高阶横模, 固体激光

Abstract:

The direct generation of the visible high-order transverse-mode laser was present by employing an off-axis pumping and cavity control in a diode end-pumped Pr:YLF laser. The detailed numerical analysis was proposed based on the intensity characteristic theory about the High-order Hermite-Gaussian (HG) beam and the coherent superposition of different HG amplitudes and phases. In our setup, a blue LD was served as an end-pumped source with a pump wavelength of 442 nm, and a compact plano-concave cavity was designed for lasing. For directly obtaining hollow and high-order HG mode 720 nm laser outputs, we manipulate the resonator of the Pr:YLF laser by employing an efficient off-axis diode-pumping. The experimental results confirmed that the high-order HG beams are generally consistent with the theoretical calculations. In this paper, we experimentally demonstrated an approach for generating the hollow and high-order (HG) mode 720 nm laser beams by manipulating laser modes inside the cavity. Further researches will focus on obtaining higher energy high-order transverse-mode laser outputs, and the method in this paper has potential in the fields of optical manipulation, optical micromachining, and optical communications.

Key words: Pr:YLF laser, Visible light, Blue laser-diode pumping, High-order Hermite-Gaussian(HG) beams, Solid-state laser

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