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Soft-x-ray wavelength shift induced by ionization effects in a capillary

机译:毛细管中的电离效应引起的软X射线波长偏移

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Coherent soft x rays are produced by high-harmonic generation in a capillary filled with Ar gas. We demonstrate that the tuning of the harmonic wavelengths with intensity and chirp arises from changes in the Ar ionization level. Control over the tuning can be achieved either by changing the average intensity of the laser pulse or by varying the quadratic spectral phase of the laser pulse. We observe an ionization-dependent blueshift of the fundamental wavelength that is directly imprinted on the harmonic wavelengths. The harmonic tuning is shown to depend on nonlinear spectral shifts of the fundamental laser pulse that are due to the plasma created by ionization, rather than directly on any chirp imposed on the fundamental wavelength.
机译:相干的软X射线是在充满Ar气体的毛细管中通过高次谐波产生而产生的。我们证明了谐波波长随强度和chi的调谐是由于Ar电离能级的变化引起的。可以通过改变激光脉冲的平均强度或通过改变激光脉冲的二次光谱相位来实现对调谐的控制。我们观察到基波的电离依赖性蓝移直接印在谐波波长上。示出了谐波调谐取决于基本激光脉冲的非线性光谱偏移,该非线性光谱偏移是由电离产生的等离子体引起的,而不是直接取决于施加在基本波长上的任何chi。

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