Broadband XUV polarimetry of high harmonics from plasma surfaces using multiple Fresnel reflections
Broadband XUV polarimetry of high harmonics from plasma surfaces using multiple Fresnel reflections
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DOI：
10.1007/s00340-014-5977-9
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发表时间：
2015-02
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通讯作者：
T. Hahn;J. Bierbach;C. Rödel;D. Hemmers;M. Yeung;B. Dromey;S. Fuchs;A. Galestian;S. Kuschel;M. Zepf;G. Paulus;G. Pretzler
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作者：
T. Hahn;J. Bierbach;C. Rödel;D. Hemmers;M. Yeung;B. Dromey;S. Fuchs;A. Galestian;S. Kuschel;M. Zepf;G. Paulus;G. Pretzler
利用强激光脉冲与气体或等离子体表面的非线性相互作用产生高次谐波是产生高相干极紫外（EUV/XUV）脉冲的最主要方法。在过去的几年中，已经发现了一些科学应用，需要测量谐波辐射的偏振。我们提出了一个宽带XUV偏振计的基础上提供了5-25的消光率为17-45 nm，这是特别适合于表面谐波的多次菲涅耳反射。该设备首先在提供线偏振XUV辐射的气体谐波源上进行了测试。在使用来自等离子体表面的HHG的进一步实验中，XUV偏振计允许首次对来自等离子体表面的高次谐波辐射进行偏振测量，这揭示了我们的生成参数所预测的线性偏振状态。强偏振XUV脉冲的产生和控制以及XUV中宽带偏振器的可用性为一系列新实验开辟了道路。例如，XUV中的二向色性、来自对准分子的椭圆偏振谐波或相对论表面谐波的选择规则可以用宽带XUV偏振仪来研究。
High-harmonic generation (HHG) by nonlinear interaction of intense laser pulses with gases or plasma surfaces is the most prominent way of creating highly coherent extreme ultraviolet (EUV/XUV) pulses. In the last years, several scientific applications have been found which require the measurement of the polarization of the harmonic radiation. We present a broadband XUV polarimeter based on multiple Fresnel reflections providing an extinction rate of 5–25 for 17–45 nm which is particularly suited for surface harmonics. The device has first been tested at a gas harmonic source providing linearly polarized XUV radiation. In a further experiment using HHG from plasma surfaces, the XUV polarimeter allowed a polarization measurement of high harmonic radiation from plasma surfaces for the first time which reveals a linear polarization state as predicted for our generation parameters. The generation and control of intense polarized XUV pulses—together with the availability of broadband polarizers in the XUV—open the way for a series of new experiments. For instance, dichroism in the XUV, elliptically polarized harmonics from aligned molecules, or the selection rules of relativistic surface harmonics can be studied with the broadband XUV polarimeter.