Relativistic plasma surfaces as an efficient second harmonic generator
Relativistic plasma surfaces as an efficient second harmonic generator
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相对论等离子体表面作为高效的二次谐波发生器
DOI：
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发表时间：
2011
期刊：
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通讯作者：
D. Neely
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文献类型：
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作者：
M. Streeter;P. Foster;F. Cameron;M. Borghesi;C. Brenner;D. Carroll;E. Divall;N. Dover;B. Dromey;P. Gallegos;J. Green;S. Hawkes;C. Hooker;S. Kar;P. McKenna;S. Nagel;Z. Najmudin;C. Palmer;R. Prasad;K. Quinn;P. Rajeev;A. Robinson;L. Romagnani;J. Schreiber;C. Spindloe;S. Ter;O. Tresca;M. Zepf;D. Neely
本文报道了50fs强度范围为1017 ~ 1021 W cm−2的p偏振激光脉冲斜入射到固体密度等离子体上的镜面反射特性。这些测量结果表明，吸收的能量分数大致保持不变，当强度接近1021 W cm−2时，二次谐波产生（SHG）的效率为22±8%。一个基于相对论振荡镜概念的简单模型再现了观测到的强度缩放，表明这是这些条件下涉及的主要过程。由于这种方法没有色散，并且在高强度下保持高空间相干性，因此可能优于晶体中和频率混合的SHG方法。
We report on the characterization of the specular reflection of 50 fs laser pulses in the intensity range 1017–1021 W cm−2 obliquely incident with p-polarization onto solid density plasmas. These measurements show that the absorbed energy fraction remains approximately constant and that second harmonic generation (SHG) achieves efficiencies of 22±8% for intensities approaching 1021 W cm−2. A simple model based on the relativistic oscillating mirror concept reproduces the observed intensity scaling, indicating that this is the dominant process involved for these conditions. This method may prove to be superior to SHG by sum frequency mixing in crystals as it is free from dispersion and retains high spatial coherence at high intensity.