同带泵浦的Tm:CYA调Q锁模激光器

孙堂正; 李云飞; 谭晶荣; 杜晓娟; 丁嘉宇; 任舒婷; 许浩; 王翀; 杨金芳; 张明霞; 朱永乐; 董忠; 令维军

doi:10.37188/CO.2023-0162

同带泵浦的Tm:CYA调Q锁模激光器

doi: 10.37188/CO.2023-0162

孙堂正^{1, 2, ,},
李云飞^{1, 2},
谭晶荣^{1, 2},
杜晓娟^{1, 2},
丁嘉宇^{1, 2},
任舒婷^{1, 2},
许浩^{1, 2},
王翀^{1, 2},
杨金芳^{1, 2},
张明霞^{1, 2},
朱永乐^{1, 2},
董忠^{1, 2},
令维军^{1, 2}

1.
甘肃省全固态激光工程研究中心, 甘肃天水 741001
2.
集成电路封装与测试教育部工程研究中心, 甘肃天水 741001

基金项目: 国家自然科学基金（No. 62165012）；甘肃省重点研发计划（No. 21YFIGE300）；甘肃省高等学校产业支撑引导项目（No. 2020C-23）；甘肃省教育厅：教育揭榜挂帅项目（No. 2021jyjbgs-06）；甘肃省高等学校创新基金项目（No. 2021B-190）；秦州区科技计划（No. 2021-SHFZG-1442)；2023年甘肃省高校青年博士支持项目（No. 2023QB-013）；天水师范学院2022 年科研创新平台建设专项（No. PTJ2022-06)；天水师范学院研究生创新引导项目（No. TYCX2235）；甘肃省优秀研究生创新之星项目（No. 2022CXZX-796）、研究生创新之星项目（No. 2023CXZX-792）

详细信息

作者简介:
孙堂正（1999—），男，江苏淮安人，硕士研究生，2021年于江苏第二师范学院取得学士学位，主要从事超快激光技术方面的研究。E-mail：210700788@qq.com

中图分类号: TN248.1
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出版历程
- 网络出版日期: 2024-02-01

Tandem pumped Q-switched mode-locked laser operation of Tm:CYA laser

SUN Tangzheng^{1, 2
, ,},
LI Yunfei^{1, 2},
TAN Jingrong^{1, 2},
DU Xiaojuan^{1, 2},
DING Jiayu^{1, 2},
REN Shuting^{1, 2},
XU Hao^{1, 2},
WANG Chong^{1, 2},
YANG Jinfang^{1, 2},
ZHANG Mingxia^{1, 2},
ZHU Yongle^{1, 2},
DONG Zhong^{1, 2},
LING Weijun^{1, 2}

1.
Gansu All-Solid State Laser Engineering Research Center, Tianshui, Gansu741000, China
2.
Integrated Circuit Engineering Research Center of the Ministry of Education, Tianshui, Gansu741000, China

Funds: Supported by National Natural Science Foundation of China (No. 62165012); Key R&D Program of Gansu Province (No. 21YFIGE300); Gansu Provincial Higher Education Industry Support and Guidance Project (No. 2020C-23); Gansu Provincial Department of Education: Education Unveiling and Leading Project (No. 2021jyjbgs-06); Gansu Provincial Higher Education Innovation Fund Project (No. 2021B-190); Qinzhou District Science and Technology Plan (No. 2021-SHFZG-1442); 2023 Gansu Provincial University Young Doctoral Support Project (No. 2023QB-013); Tianshui Normal University 2022 special project for the construction of scientific research and innovation platform (No. PTJ2022-06); Tianshui Normal University Graduate Innovation Guidance Project (No. TYCX2235); Gansu Province Outstanding Graduate Innovation Star Program (No. 2022CXZX-796)、 Graduate Innovation Star Program (No. 2023CXZX-792).

More Information

Corresponding author: 210700788@qq.com

摘要

摘要:
以半导体可饱和吸收镜SESAM作为锁模启动元件，利用同带泵浦技术首次在Tm:CaYALO4(Tm:CYA)激光器实现了被动调Q锁模运转。光路采用X型四镜腔结构，泵浦源采用Er:Y₃Al₅O₁₂(Er:YAG)固体激光器，其中心波长为1650 nm。分别采用0.5%、1.5%、3%和5%透过率的输出耦合镜，对激光器连续光输出和锁模输出特性进行研究，实验结果表明，当采用5%透过率的输出耦合镜时，激光器的输出特性最好。当激光器在连续光运转情况下，得到了894 mW的最高功率和16%的最大斜效率输出。将连续光功率优化至最高，在光路中加入SESAM锁模元件后，当吸收泵浦功率大于1.86 W时，激光运转进入不稳定的调Q状态；当吸收泵浦功率提高到5.7 W时，实现了稳定的被动调Q锁模运转；吸收泵浦功率达到6.99 W时，采用5%的输出镜，获得了最高输出功率为399 mW的锁模脉冲激光。此时调Q包络下重复频率为98.11 MHz，脉冲宽度为619.4 ps，对应最大单脉冲能量为4.07 nJ。调Q包络中锁模脉冲调制深度接近100%。实验结果表明，同带泵浦技术可以用于激光器以实现调Q锁模脉冲的产生，为超短脉冲激光的产生提供了一种新的泵浦方式。
- Tm:CYA激光器 /
- 同带泵浦 /
- 半导体可饱和吸收镜(SESAM) /
- 调Q锁模
Abstract:
Passively Q-switched mode-locked operation was realized for the first time by inserting a semiconductor saturable absorption mirror (SESAM) mode-locking element into a Tm:CaYALO₄(Tm:CYA) laser using in-band pumping technology. The laser cavity adopted an X-type four-mirror cavity structure, and the pump source was an Er:Y₃Al₅O₁₂(Er:YAG) solid-state laser with a central wavelength of 1650 nm. Output coupling mirrors with transmittances of 0.5%, 1.5%, 3%, and 5% were used to study the laser’s continuous wave (CW) output and mode-locking output characteristics. The experimental results show that the laser has the best output characteristics when an output coupling mirror with a transmittance of 5% is used. The maximum power of 894 mW and the maximum slope efficiency of 16% were obtained when the laser operated in the CW regime. After the CW power was optimized to the highest, the SESAM mode-locked element was added to the optical path. When the absorbed pump power became greater than 1.86 W, the laser operation entered an unstable Q-switched state; when the absorbed pump power increased to 5.7 W, a stable passively Q-switched mode-locked operation was achieved; when the absorbed pump power reached 6.99 W, a mode-locked pulse laser with a maximum output power of 399 mW was obtained by using a 5% output mirror. At that time, the repetition frequency under the Q-switched envelope was 98.11 MHz, the pulse width was 619.4 ps, and the corresponding maximum single pulse energy was 4.07 nJ. The mode-locked pulse modulation depth in a Q-switched envelope was observed to be close to 100%. The experimental results show that same-band pumping technology can be used in lasers to generate Q-switched mode-locked pulses, which provides a new pumping method for generating ultrashort pulse lasers.
- Tm:CYA laser /
- tandem-pumping /
- semiconductor saturable absorption mirror (SESAM) /
- Q-switched mode-locked

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图 1 实验装置原理图

Figure 1. Schematic diagram of the experimental device

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图 2 连续光输出功率随吸收泵浦功率变化图

Figure 2. The output power of continuous laser varies with the absorption pump power

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图 3 锁模输出功率随泵浦功率变化图

Figure 3. The average output power of the mode-locking laser versus the pump power

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图 4 调Q脉冲重复频率和脉冲宽度与吸收的泵浦功率的变化关系

Figure 4. The Q-switched pulse repetition rate and width versus the absorbed pump power

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图 5 连续光和锁模激光光谱图

Figure 5. The CW and mode-locked laser spectrogram

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图 6 纳秒和微秒时间刻度下的脉冲锁模序列

Figure 6. The Q-switched mode-locked pulse trains in nanosecond and microsecond time scales, respectively

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图 7 锁模脉冲重复频率和脉冲宽度

Figure 7. Repetition frequency and width of the mode-locked pulse

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