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首页> 外文会议>Optics and measurement confercnec 2014 >Cooling options for high-average-power laser mirrors
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Cooling options for high-average-power laser mirrors

机译：高平均功率激光镜的冷却选项

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摘要

Thermally-induced deformations of steering mirrors reflecting 100 J/10 Hz laser pulses in vacuum have been analyzed. This deformation is caused by the thermal stress arisen due to parasitic absorption of 1 kW square-shaped flat-top laser beam in the dielectric multi-layer structure. Deformation depends on amount of absorbed power and geometry of the mirror as well as on the heat removal scheme. In our calculations, the following percentages of absorption of the incident power have been used: 1 %, 0.5 % and 0.1%. The absorbed power has been considered to be much higher than that expected in reality to assess the worst case scenario. Rectangular and circular mirrors made of zerodur (low thermal expansion glass) were considered for these simulations. The effect of coating layers on induced deformations has been neglected. Induced deformation of the mirror surface can significantly degrade the quality of the laser beam in the beam delivery system. Therefore, the proper design of the cooling scheme for the mirror in order to minimize the deformations is needed. Three possible cooling schemes of the mirror have been investigated. The first one takes advantage of a radiation cooling of the mirror and a copper heatsink fixed to the rear face of the mirror, the second scheme is based on additional heat conduction provided by flexible copper wires connected to the mirror holder, and the last scheme combines two above mentioned methods.
机译：分析了在真空中反射100 J / 10 Hz激光脉冲的转向镜的热诱导变形。这种变形是由于在电介质多层结构中由于1 kW方形平顶激光束的寄生吸收而产生的热应力引起的。变形取决于反射镜的吸收功率和几何形状以及散热方案。在我们的计算中，使用了以下入射功率吸收百分比：1％，0.5％和0.1％。吸收功率被认为远高于实际评估最坏情况的预期功率。在这些模拟中考虑了用zerodur（低热膨胀玻璃）制成的矩形和圆形反射镜。涂层对诱发变形的影响已被忽略。镜面引起的变形会显着降低光束传输系统中激光束的质量。因此，需要适当设计反射镜的冷却方案以最小化变形。已经研究了三种可能的反射镜冷却方案。第一种方案利用反射镜的辐射冷却和固定在反射镜背面的铜散热片，第二种方案基于连接到镜架的柔性铜线提供的额外热传导，最后一种方案结合了上面提到的两种方法。

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  • 来源
    《Optics and measurement confercnec 2014》|2014年|94421G.1-94421G.7|共7页
  • 会议地点 Liberec(CZ)
  • 作者

    D. Vojna; O. Slezak; A. Lucianetti; T. Mocek;

  • 作者单位

    HiLASE Centre, Institute of Physics ASCR v.v.i., Za Radnici 828, Dolni Brezany, 25241, Czech Republic,Faculty of Electrical Engineering, Czech Technical University, Prague, Czech Republic;

    HiLASE Centre, Institute of Physics ASCR v.v.i., Za Radnici 828, Dolni Brezany, 25241, Czech Republic;

    HiLASE Centre, Institute of Physics ASCR v.v.i., Za Radnici 828, Dolni Brezany, 25241, Czech Republic;

    HiLASE Centre, Institute of Physics ASCR v.v.i., Za Radnici 828, Dolni Brezany, 25241, Czech Republic;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    high-average-power laser; thermooptic effects; wavefront aberrations;

    机译：高功率激光器热光效应波前像差;

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