| 水冷10 Hz Yb:YAG激光放大器热管理 |
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| 引用本文： | 蒋新颖,王振国,郑建刚,严雄伟,李敏,张雄军,粟敬钦,朱启华,郑万国.水冷10 Hz Yb:YAG激光放大器热管理[J].强激光与粒子束,2020,32(1):011010-1-011010-7. |
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| 作者姓名： | 蒋新颖 王振国 郑建刚 严雄伟 李敏 张雄军 粟敬钦 朱启华 郑万国 |
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| 作者单位： | 中国工程物理研究院激光聚变研究中心,四川绵阳 621900;中国工程物理研究院高能激光科学与技术重点实验室,四川绵阳 621900;中国工程物理研究院研究生院,北京 100088;中国工程物理研究院激光聚变研究中心,四川绵阳 621900;中国工程物理研究院高能激光科学与技术重点实验室,四川绵阳 621900;中国工程物理研究院激光聚变研究中心,四川绵阳 621900 |
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| 基金项目： | Key Laboratory of Science and Technology on High Energy Laser,China Academy of Engineering Physics(2019HEL05-2) |
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| 摘 要： | 为了控制重频放大器的热致波前畸变,设计并加工了均匀冷却的背面水冷激活镜激光放大器,对放大器的热畸变特性开展了实验研究,实验发现在泵浦功率密度较高即重复频率达到10 Hz,平均功率密度达到200 W/cm2时,放大器的热畸变既影响远场分布又对近场产生显著的调制。近场的调制会给放大器带来较大的损伤风险。为了消除热畸变对近场的调制,首先对泵浦强度分布进行了匀化,然后对介质进行了边缘热平衡控制,消除了热畸变引起的近场调制。通过对上述因素的控制,采用水冷激活镜构型的四程放大器实现了在10 Hz频率下良好运行。在没有进行主动补偿的情况下,实现了远场焦斑优于5倍衍射极限的输出。
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| 关 键 词： | 激光放大器 二极管泵浦激光器 热效应 水冷激活镜 |
| 收稿时间： | 2019-11-15 |
Thermal management of water-cooled 10Hz Yb:YAG laser amplifier |
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| Jiang Xinying,Wang Zhenguo,Zheng Jiangang,Yan Xiongwei,Li Min,Zhang Xiongjun,Su Jingqin,Zhu Qihua,Zheng Wanguo.Thermal management of water-cooled 10Hz Yb:YAG laser amplifier[J].High Power Laser and Particle Beams,2020,32(1):011010-1-011010-7. |
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| Authors: | Jiang Xinying Wang Zhenguo Zheng Jiangang Yan Xiongwei Li Min Zhang Xiongjun Su Jingqin Zhu Qihua Zheng Wanguo |
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| Affiliation: | 1.Research Center of Laser Fusion , CAEP, Mianyang 621900, China2.Key Laboratory of Science and Technology on High Energy Laser, China Academy of Engineering Physics, Mianyang 621900, China3.Graduate School, CAEP, Beijing 100088, China |
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| Abstract: | To control the thermal wavefront distortion of repetition frequency laser,we′ve developed a watercooled active-mirror laser amplifier,which was uniformly cooled from the rear of crystal disk.The numerical anslysis and experimental study on the characterstics of the amplifier’s thermal distortion were carried out.It was found that the thermal distorition devoted a significiant modulation to the near field of the laser when the average pump power density was as high as 200 W/cm2 with the operation frequency of 10 Hz.Near-field modulation would bring a risk to damage the amplifier.To eliminate the modulation of thermal distortion in the near field,two approaches were taken.Firstly,the pump intensity distribution was homogenized,then the edge thermal balance control was carried out.The near field modulation from thermal wavefront distortion was eliminated by these means,a four-pass amplifier with water-cooled laser heads ran well at 10 Hz.The focal spot of output laser was smaller than 5 diffraction limits without any compensation. |
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| Keywords: | laser amplifiers diode-pumped lasers thermal effects water-cooled active mirror |
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