一种具有大通光孔的碟片多程泵浦结构

陈涵天; 董静; 王海林; 朱广志; 朱晓

doi:10.11884/HPLPB202234.210278

一种具有大通光孔的碟片多程泵浦结构

doi: 10.11884/HPLPB202234.210278

陈涵天^{1, 2,},
董静^{1, 2},
王海林^{1, 2},
朱广志^{1, 2},
朱晓^{1, 2, ,}

1.
华中科技大学光学与电子信息学院，武汉 430074
2.
激光加工国家工程研究中心，武汉 430074

基金项目: 国家重点研发计划项目（2016YFE0202500）; 国家自然科学基金项目（61975060）

详细信息

作者简介:
陈涵天，D201880624@hust.edu.cn

通讯作者:
朱　晓，zx@hust.edu.cn

中图分类号: TN248.1
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- 被引次数: 8
出版历程
- 收稿日期: 2021-07-13
- 修回日期: 2020-11-09
- 网络出版日期: 2021-11-17
- 刊出日期: 2022-01-13

A thin-disk multi-pass pump scheme with large laser aperture

Chen Hantian^{1, 2
,},
Dong Jing^{1, 2},
Wang Hailin^{1, 2},
Zhu Guangzhi^{1, 2},
Zhu Xiao^{1, 2
, ,}

1.
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2.
National Engineering Research Center for Laser Processing, Wuhan 430074, China

摘要

摘要: 提出了一种基于4-f成像的新型碟片多程泵浦方案。该方案由一片大抛物镜和两组转折棱镜组成多程泵浦的基本传输结构。这种方案拥有0～90°的理论通光孔径角，比目前常见的泵浦结构方案的通光孔径角范围都更宽。在该方案中，碟片上的泵浦光斑具有良好的重合性和锐利的边缘。该泵浦结构在注入344 W、18次泵浦的条件下实现了141 W的多模激光输出，光-光转换效率达到41%，斜率效率接近50%。
- 碟片激光器 /
- 多程泵浦 /
- 4-f成像系统 /
- 光斑均匀性 /
- 抛物面
Abstract: In this paper, a novel multi-pass pump scheme based on 4-f imaging is proposed. The scheme consists of a large parabolic mirror and two groups of folding prisms, which are the basic propagation structure of the scheme. The pump scheme has a theoretical aperture of 0−90° for laser transmission, which is wider than that of the commonly used pump schemes. The pump spot on the disk in the pump scheme has a good coincidence with sharp edges. With 344 W power injection and 18 times pumping, an average output of 141 W multi-mode laser is achieved. The optical to optical efficiency reaches 41%, and the slope efficiency is close to 50%.
- thin-disk laser /
- multi-pass pump /
- 4-f imaging system /
- spot uniformity /
- parabolic mirror

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图 1 经过18次泵浦的RDSP泵浦模块的3D示意图（a）和正视图（b）

Figure 1. (a) 3D structure and (b) front view of the RDSP pump scheme with 18 times pumping

下载: 全尺寸图片幻灯片

图 2 三角形的泵浦光斑经过碟片（a）1次（b）12次之后所形成的光斑形状^[11]

Figure 2. Appearance of the spot of propagating (a) once (b) 12 times through the thin-disk for a triangle shaped pump spot

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图 3 泵浦模块输出功率与光-光转换效率测试结果

Figure 3. Experimental results of the output power and the optical to optical efficiency of the pump scheme

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表 1 3种泵浦方案的对比

Table 1. Comparison of the three pump schemes

evaluating indicator	ADSP	RDDP	RDSP
sharpness of pump spot	radially diffusion	diffusion in x and y direction	diffusion in x and y direction
pump spot shape that coincides perfectly	circle or regular polygon with appropriate angle	symmetric about x axis and y axis	symmetric about x axis and y axis
laser transmission angle	small angle only	small angle blocked	0°～90° in theory
anti-disturbance ability^[8]	low	high	low
number of reflections on mirrors in a cycle	4	5	4
cost	low (one parabolic mirror)	high (two parabolic mirrors)	low (one parabolic mirror)
adjusting difficulty	high	low	medium

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参考文献(11)

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[7]	Schuhmann K, Hänsch T W, Kirch K, et al. Thin-disk laser pump schemes for large number of passes and moderate pump source quality[J]. Applied Optics, 2015, 54(32): 9400-9408. doi: 10.1364/AO.54.009400
[8]	Huang Yan, Zhu Xiao, Zhu Guangzhi, et al. A multi-pass pumping scheme for thin disk lasers with good anti-disturbance ability[J]. Optics Express, 2015, 23(4): 4605-4613. doi: 10.1364/OE.23.004605
[9]	Song Enmao, Zhu Guangzhi, Wang Hailin, et al. Minimizing thermal load and stabilizing mode in Yb: YAG thin disk laser by 1030 nm multi-pass pumping[J]. IEEE Photonics Technology Letters, 2020, 32(16): 1011-1014. doi: 10.1109/LPT.2020.3008410
[10]	Chen Hantian, Song Enmao, Dong Jing, et al. Compact thin-disk multipass amplifier tolerant of strong disk thermal distortions[C]//Proceedings of CLEO: Science and Innovations 2020. 2020.
[11]	黄彦. 碟片激光器泵浦均匀性的研究[D]. 武汉: 华中科技大学, 2016: 90-93 Huang Yan. The study of pumping uniformity in thin disk lasers[D]. Wuhan: Huazhong University of Science and Technology, 2016: 90-93

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