Increasing the brightness of harmonic XUV radiation with spatially-tailored driver beams

Increasing the brightness of harmonic XUV radiation with spatially-tailored driver beams
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使用空间定制的驱动光束提高谐波 XUV 辐射的亮度

DOI:
10.1088/2040-8986/abcc56
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发表时间:
2020
期刊:
影响因子:
2.1
通讯作者:
Treacher D
Treacher D
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Treacher D

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通过松散聚焦峰值功率激光脉冲,利用磁通与驱动光斑尺寸的二次标度,可以产生明亮的高谐波源,但代价是更大的实验足迹。在这里,我们提出了一种方法来增加谐波源的亮度(同时保持紧凑的实验几何形状),通过空间塑造驱动激光的横向焦强度分布从高斯到超高斯。使用纯相位空间光调制器,我们增加了超高斯焦轮廓的大小和顺序,从而比高斯光束更有效地增加了谐波发射器的数量。这提供了一个松散的聚焦几何形状的好处,产生五倍的谐波亮度增加,同时保持恒定的实验足迹。这项技术可以很容易地应用于现有的高谐波系统,为需要明亮、紧凑的相干短波辐射源的应用开辟了新的机会。
Bright high harmonic sources can be produced by loosely focussing high peak power laser pulses to exploit the quadratic scaling of flux with driver spot size at the expense of a larger experimental footprint. Here, we present a method for increasing the brightness of a harmonic source (while maintaining a compact experimental geometry) by spatially shaping the transverse focal intensity distribution of a driving laser from a Gaussian to supergaussian. Using a phase-only spatial light modulator we increase the size and order of the supergaussian focal profiles, thereby increasing the number of harmonic emitters more efficiently than possible with Gaussian beams. This provides the benefits of a loose focussing geometry, yielding a five-fold increase in harmonic brightness, whilst maintaining a constant experimental footprint. This technique can readily be applied to existing high harmonic systems, opening new opportunities for applications requiring bright, compact sources of coherent short wavelength radiation.
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