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2.94 μm纳秒铒激光是宽调谐中红外激光和临床医疗研究中重要的固体激光源. 本文研制了新型LiNbO3声光调Q Er:YAG 激光器, 研究了20 Hz重复频率下不同调Q延迟时间和耦合腔镜反射率对激光输出脉冲特性的影响规律. 根据测量激光器的热透镜焦距设计了凹凸谐振腔补偿热透镜效应, 获得了激光单脉冲能量为34.68 mJ、脉冲宽度为119.9 ns的调Q输出, 相应的峰值功率为289.24 kW, 与平平腔相比输出能量提高了2.09倍. 据我们所知, 这是目前声光调Q Er:YAG激光器中获得的最高能量, 可为进一步研究宽调谐中红外激光技术提供新的手段.
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关键词:
- 固体激光器 /
- Er:YAG /
- LiNbO3声光调Q开关
The 2.94 μm nanosecond erbium laser is an important solid-state laser source in the wide-tuning mid-infrared laser and clinical medical research. In this work, a novel LiNbO3 acousto-optically Q-switched Er:YAG laser is developed, and the effects of different Q-switched delay times and output coupler’s reflectivities on the laser output pulse characteristics are investigated at a repetition frequency of 20 Hz. A concave-convex resonant cavity is designed to compensate for the thermal lens effect, and a single Q-switched pulse is obtained. The maximum pulse energy and minimum pulse duration are 34.68 mJ and 119.9 ns respectively, with corresponding peak power of 289.24 kW. Compared with the plane-plane cavity, the cavity proposed herein increases the output energy by 2.09 times. To our knowledge, this is the highest energy ever obtained in the acousto-optically Q-switched Er:YAG laser. This work provides a new means for further studying wide-tuning mid-infrared laser technology.-
Keywords:
- solid-state laser /
- Er:YAG laser /
- LiNbO3 acousto-optic Q-switch
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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图 1 LiNbO3声光调Q Er:YAG激光器实验装置图
Fig. 1. Schematic diagram of the Er:YAG laser system with LiNbO3-based acousto-optic Q-switch.
图 3 谐振腔稳定性$g_1g_2$与全反镜曲率半径变化关系
Fig. 3. Stability of the resonant cavity $g_1g_2 $ versus radius of curvature variation in total reflectors.
图 4 不同曲率半径下激光器输出能量曲线对比
Fig. 4. Comparison of laser output energy curves at different radii of curvature.
图 5 不同调Q延时下输出能量随泵浦能量变化特性曲线
Fig. 5. Characteristic curves of output energy versus pump energy with different Q-delays.
图 6 20 Hz时不同反射率下调Q输出能量随泵浦能量变化的特性曲线
Fig. 6. Characteristic curves of the output energy of Q-switched laser versus pump energy at 20 Hz with different reflectivities.
图 7 不同腔型下脉冲能量随泵浦能量的变化曲线
Fig. 7. Curves of pulse energy with pump energy under different cavity types.
图 8 不同腔型下脉冲宽度随泵浦能量的变化曲线
Fig. 8. Curves of pulse width with pump energy under different cavity types.
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[1] Li E, Uehara H, Tokita S, Yao W, Yasuhara R 2023 Opt. Laser Technol. 157 108783
Google Scholar
[2] Martinez A D, Martyshkin D V, Camata R P, Fedorov V V, Mirov S B 2015 Opt. Mater. Express 5 2036
Google Scholar
[3] Jelínková H, Doroshenko M, Jelínek M, Vyhlídal D, Šulc J, Němec M, Kubeček V, Zagoruiko Y, Kovalenko N, Gerasimenko A, Puzikov V, Komar V 2013 Conference on Solid State Lasers XXII—Technology and Devices San Francisco, CA, February 3–5, 2013 p85990E
[4] Li E, Uehara H, Yao W, Tokita S, Potemkin F, Yasuhara R 2021 Opt. Express 29 44118
Google Scholar
[5] Huang K, Wang Y Q, Fang J N, Chen H X, Xu M H, Hao Q, Yan M, Zeng H P 2021 High Power Laser Sci. Eng. 9 e4
Google Scholar
[6] Kostyukova N Y, Boyko A A, Badikov V, Badikov D, Shevyrdyaeva G, Panyutin V, Marchev G M, Kolker D B, Petrov V 2016 Opt. Lett. 41 3667
Google Scholar
[7] 江健涛, 魏蒙恩, 熊正东, 吴先友, 程庭清, 江海河 2021 中国激光 48 0107001
Google Scholar
Jiang J T, Wei M E, Xiong Z D, Wu X Y, Cheng T Q, Jiang H H 2021 Chin. J. Lasers 48 0107001
Google Scholar
[8] Zajac A, Skorczakowski M, Swiderski J, Nyga P 2004 Opt. Express 12 5125
Google Scholar
[9] Gordienko V, Potemkin F, Pushkin A, Sirotkin A, Firsov V 2015 J. Russ. Laser Res. 36 570
Google Scholar
[10] 杨经纬, 王礼, 吴先友, 江海河 2012 光学学报 32 0614002
Google Scholar
Yang J W, Wang L, Wu X Y, Jiang H H 2012 Acta Opt. Sin. 32 0614002
Google Scholar
[11] Yang J W, Wang L, Wu X Y, Cheng T Q, Jiang H H 2014 Opt. Express 22 15686
Google Scholar
[12] Schnell S, Ostroumov V, Breguet J, Luthy W A, Weber H, Shcherbakov I 1990 IEEE J. Quantum Electron. 26 1111
Google Scholar
[13] Pushkin A V, Mazur M M, Sirotkin A A, Firsov V V, Potemkin F V 2019 Opt. Lett. 44 4837
Google Scholar
[14] Jiang L L, Wu Z C, Cheng T Q, Jiang H H 2022 Opt. Lett. 47 6193
Google Scholar
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