Ion-Based High-Harmonic Generation with 1 keV Photon Energy

Hsu-hsin Chu^1,2*, Yao-Li Liu¹, Jyhpyng Wang^3,1,2

¹Department of Physics, National Central University, Taoyuan, Taiwan
²Center for High Energy and High Field Physics, National Central University, Taoyuan, Taiwan
³Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan

* Presenter:Hsu-hsin Chu, email:hhchu0821@gmail.com

An ion-based high-harmonic generation scheme is proposed. The He¹⁺ ions are chosen as the interacting medium to extend the cutoff photon energy over 1 keV. The transverse selective-zoning method of quasi-phase-matching is utilized to overcome the severe plasma dispersion in the highly ionized medium. By using a spatial light modulator to control the quasi-phase-matching pattern, the spectral range can be tuned from water window to keV x-ray. Our calculation shows that the relative conversion efficiency reaches 15% of the perfect phase-matching condition.

Keywords: high-harmonic generation, quasi-phase-matching, keV x-ray, water window