Phase matching of high harmonic generation in the soft and hard X-ray regions of the spectrum
arxiv(2024)
摘要
We show how bright, fully coherent, hard x-ray beams can be generated through
nonlinear upconversion of femtosecond laser light. By using longer-wavelength
mid-infrared driving lasers of moderate peak intensity, full phase matching of
the high harmonic generation process can extend, in theory, into the hard x-ray
region of the spectrum. We identify the dominant phase matching mechanism for
long wavelength driving lasers, and verify our predictions experimentally by
demonstrating phase-matched up-conversion into the soft x-ray region of the
spectrum around 330 eV using an extended, high-pressure, gas medium that is
weakly ionized by the laser. Scaling of the overall conversion efficiency is
surprisingly favorable as the wavelength of the driving laser is increased,
making useful, fully coherent, multi-keV x-ray sources feasible. Finally, we
show that the rapidly decreasing microscopic single-atom yield at longer
driving wavelengths is compensated macroscopically by an increasing optimal
pressure for phase matching and a rapidly decreasing reabsorption of the
generated light at higher photon energies.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要