Abstract
In high harmonic generation(HHG),Laguerre-Gaussian(LG)beams are used to generate extreme ultraviolet(XUV)vortices with well-defined orbital angular momentum(OAM),which have potential applications in fields such as mi-croscopy and spectroscopy.An experimental study on the HHG driven by vortex and Gaussian beams is conducted in this work.It is found that the intensity of vortex harmonics is positively correlated with the laser energy and gas pressure.The structure and intensity distribution of the vortex harmonics exhibit significant dependence on the relative position be-tween the gas jet and the laser focus.The ring-like structures observed in the vortex harmonics,and the interference of quantum paths provide an explanation for the distinct structural characteristics.Moreover,by adjusting the relative position between the jet and laser focus,it is possible to discern the contributions from different quantum paths.The optimization of the HH vortex field is applicable to the XUV,which opens up a new way for exploiting the potential in optical spin or manipulating electrons by using the photon with tunable orbital angular momentum.
基金项目
国家自然科学基金(11974137)
国家自然科学基金(92250306)
国家自然科学基金(12304302)
National Key Program for science and Technology Research and Development(2019YFA0307700)
吉林省自然科学基金(YDZJ202101ZYTS157)
吉林省自然科学基金(YDZJ202201ZYTS314)
Scientific Research Foundation of Jilin Provincial Education Department,China(JJKH20230283KJ)
NETL
NSTL
万方数据