LD端面泵浦Tm:SrF<sub>2</sub>电光调Q激光器

吴广; 张振; 王韬; 季来林; 崔勇; 高妍琦; 隋展

doi:10.11884/HPLPB202436.230140

LD端面泵浦Tm:SrF₂电光调Q激光器

doi: 10.11884/HPLPB202436.230140

吴广^1,,
张振²,
王韬¹,
季来林^1, ,,
崔勇¹,
高妍琦^1, ,,
隋展¹

1.
中国工程物理研究院上海激光等离子体研究所，上海 201800
2.
中国科学院上海硅酸盐研究所，上海 201899

详细信息

作者简介:
吴　广，wg1553480@163.com

通讯作者:
季来林，jsycjll@siom.ac.cn

高妍琦，liufenggyq@siom.ac.cn。

中图分类号: TN248.1
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- 文章访问数: 65
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- 被引次数: 0
出版历程
- 收稿日期: 2023-05-19
- 修回日期: 2024-01-04
- 录用日期: 2024-01-04
- 网络出版日期: 2024-01-29

Laser-diodeend-pumped electro-optic Q-switched Tm:SrF₂ laser

Wu Guang^1
,,
Zhang Zhen²,
Wang Tao¹,
Ji Lailin^{1
, ,},
Cui Yong¹,
Gao Yanqi^{1
, ,},
Sui Zhan¹

1.
Shanghai Institute of Laser Plasma, CAEP, Shanghai 201800, China
2.
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China

摘要

摘要: 高掺杂浓度的Tm³⁺增益介质能通过交叉弛豫过程提高激光器的量子效率，但同时也会增加能量上转换带来的损耗，从而限制激光器效率的进一步提升。对Tm:SrF₂晶体的荧光特性以及激光性能展开研究。在激光二极管（LD）端面泵浦下，实现最大功率2.99 W的自由运转输出，激光器的泵浦阈值为0.89 W，中心波长1851 nm，斜效率高达82.1%。采用KTP电光调Q开关演示了Tm:SrF₂激光器的电光调Q输出特性。在500 Hz重复频率下，获得了1.02 mJ的最大单脉冲能量，泵浦阈值为2.01 W，最短脉冲宽度为45 ns，对应峰值功率为22.67 kW。实验结果表明，基于LD泵浦的Tm:SrF₂激光器具有非常高的效率，有望成为中红外光学参量振荡器（OPO）和光学参量放大器（OPA）的理想泵浦源。
- 激光技术 /
- Tm:SrF₂激光器 /
- 电光调Q /
- LD端面泵浦 /
- 斜效率
Abstract: The Tm³⁺ gain medium with high doping concentration can improve the quantum efficiency of the laser through the cross relaxation process, but it also increases the energy loss caused by energy up-conversion and limits the improvement of laser efficiency. The fluorescence characteristics and laser performance of Tm:SrF₂ crystal are studied. Under laser-diode (LD) end-pumping, a continuous-wave laser with a maximum output power of 2.99 W and a slope efficiency of up to 82.1% is realized. The pump threshold of the laser is 0.81 W, and the center wavelength is 1851 nm. Electro-optic Q-switching of the Tm:SrF₂ laser is demonstrated. At the repetition rate of 500 Hz, a maximum pulse energy of 1.02 mJ and a minimum pulse width of 45 ns are achieved, resulting in a peak power of 22.67 kW. The experimental results indicate that the Tm:SrF₂ laser based on LD pumping has very high efficiency and is expected to be an ideal pump source for optical parametric oscillators (OPOs) and optical parametric amplifiers (OPAs).
- laser technology /
- Tm:SrF₂ laser /
- electro-optical Q-switching /
- LD end-pump /
- slope efficiency

HTML全文

图 1 Tm:SrF₂晶体荧光特性

Figure 1. Fluorescence characteristics of Tm:SrF₂ crystal

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图 2 Tm:SrF₂电光调Q激光器装置图

Figure 2. Schematic diagram of electro-optical Q-switched Tm:SrF₂ laser

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图 3 谐振腔不同位置处的横模光斑半径

Figure 3. Transverse mode spot radius at different positions of the resonant cavity

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图 4 激光器脉冲宽度与腔长的关系

Figure 4. Relationship between laser pulse width and cavity length

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图 5 Tm:SrF₂激光器自由运转输出特性

Figure 5. Output characteristics of free running Tm:SrF₂ laser

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图 6 Tm:SrF₂激光器电光调Q输出特性

Figure 6. Output characteristics of electro-optic Q-switched Tm:SrF₂ laser

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表 1 掺Tm块状晶体的激光性能

Table 1. Laser performance of Tm-doped bulk crystals

material	doping concentration/%	output power/W	slope efficiency/%	photon quantum efficiency	reference
Tm:YAG	3.5	25.40	41.2	1.05	[6]
Tm:YAP	3.0	6.35	60.4	1.51	[7]
Tm:YLF	2.5	8.50	53.4	1.23	[8]
Tm:LuAG	3.5	3.70	54.6	1.39	[9]
Tm:SrF₂	5.2	0.24	50.0	1.28	[10]
Tm:CaF₂	3.0	2.71	70.3	1.68	[18]
Tm:SrF₂	2.0	2.99	82.1	1.92	this paper

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