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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.
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Keywords:
- solid-state laser /
- Er:YAG laser /
- LiNbO3 acousto-optic Q-switch
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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
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Google Scholar
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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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图 1 LiNbO3声光调Q Er:YAG激光器实验装置图
Figure 1. Schematic diagram of the Er:YAG laser system with LiNbO3-based acousto-optic Q-switch.
图 2 热焦距随泵浦功率变化趋势
Figure 2. Trend of thermal focal length with pump power.
图 3 谐振腔稳定性$g_1g_2$与全反镜曲率半径变化关系
Figure 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
Figure 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
Figure 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
Figure 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
Figure 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
Figure 8. Curves of pulse width with pump energy under different cavity types.
图 9 30 min内激光器输出能量的稳定性
Figure 9. Stability of the laser output energy within 30 min.
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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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