光冲击增强自光子加速
Optical Shock-Enhanced Self-Photon Acceleration
摘要：
光子加速器可以在移动的电子密度梯度中高效地展宽激光脉冲。当由常规激光脉冲驱动时，加速光子所经历的群速度走离以及来自衍射和折射的梯度的恶化限制了光谱加宽的程度。在这里，我们表明，激光脉冲的形状的时空和横向强度分布克服了这些限制，通过创建一个可调速度的引导密度分布。自光子加速在这个配置文件导致戏剧性的光谱展宽和强度陡峭，形成一个光学冲击，进一步提高光谱展宽的速度。在这个新的制度，多倍频程光谱延伸从$400 nm - 60 nm$波长，支持近变换限制$< 400 as$脉冲，产生超过$<100 μ$ m的相互作用长度。
英文摘要：
Photon accelerators can spectrally broaden laser pulses with high efficiency in moving electron density gradients. When driven by a conventional laser pulse, the group velocity walk-off experienced by the accelerated photons and deterioration of the gradient from diffraction and refraction limit the extent of spectral broadening. Here we show that a laser pulse with a shaped space-time and transverse intensity profile overcomes these limitations by creating a guiding density profile at a tunable velocity. Self-photon acceleration in this profile leads to dramatic spectral broadening and intensity steepening, forming an optical shock that further enhances the rate of spectral broadening. In this new regime, multi-octave spectra extending from $400 nm - 60 nm$ wavelengths, which support near-transform limited $< 400 as$ pulses, are generated over $<100 μ$m of interaction length.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
