Material survey for a novel beam splitter separating high-order harmonics from high-average-power fundamental pulses
Material survey for a novel beam splitter separating high-order harmonics from high-average-power fundamental pulses
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用于将高次谐波与高平均功率基波脉冲分离的新型分束器的材料调查
DOI：
10.1143/jjap.51.062601
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发表时间：
2012
影响因子：
1.5
通讯作者：
Y. Kojima
中科院分区：
文献类型：
--
作者：
H. Fukuzawa;X.-J. Liu;K. Motomura;Y. Kojima
我们研究了在高平均功率可见光和近红外(VIS-NIR)激光照射下缓解热问题的新型分束器(BS)材料。这种材料应该有效地反射极紫外(XUV)光谱区的高次谐波光束，并以布鲁斯特入射的方式传输可见光-近红外基波光束。我们研究了晶体碳化硅、金刚石和金红石的光学和热机械性质，因为它们在可见光-近红外光下表现出高透明度和高折射率。我们还通过测量传统不透明BS材料的热变形来解决它们的热问题。我们已经证明了晶态碳化硅是其他材料中最有前途的候选材料，因为它对XUV光有很高的反射率，以及可以忽略的热畸变。晶态碳化硅板材的表面平整度必须得到改善，才能在XUV光谱区实现可应用的BS。
We have investigated novel beam splitter (BS) materials to relax thermal issues under irradiation of a high-average-power visible and near infrared (VIS–NIR) laser beam. The material should efficiently reflect a high-order harmonic beam in the extreme ultraviolet (XUV) spectral region and transmit a VIS–NIR fundamental laser beam at a Brewster incidence for the latter beam. We have investigated optical and thermo-mechanical properties of crystalline silicon carbide (SiC), diamond, and rutile since they exhibit high transparency and high index of refraction for a VIS–NIR light. We also address thermal issues of conventional opaque BS materials by measuring their thermal distortion. We have shown that crystalline SiC is the most promising candidate among the other materials because of a high reflectivity for XUV light, as well as an ignorable thermal distortion. The surface flatness of a crystalline SiC plate must be improved to realize an applicable BS in the XUV spectral region.