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

Article Contents

Chinese Optics > 2024 > Accepted Manuscript

SUN Tangzheng, LI Yunfei, TAN Jingrong, DU Xiaojuan, DING Jiayu, REN Shuting, XU Hao, WANG Chong, YANG Jinfang, ZHANG Mingxia, ZHU Yongle, DONG Zhong, LING Weijun. Tandem pumped Q-switched mode-locked laser operation of Tm:CYA laser[J]. Chinese Optics. doi: 10.37188/CO.2023-0162

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

doi: 10.37188/CO.2023-0162

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).

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Corresponding author: 210700788@qq.com
Available Online: 01 Feb 2024

Abstract

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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References(21)

References

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