Single-wavelength size focusing of ultra-intense ultrashort lasers with rotational hyperbolic mirrors

作者：Zhaoyang Li, Yanqi Liu, Xiaoyang Guo, Yuxin Leng, Ruxin Li · 发表于：Advanced Photonics Nexus · 年份：2024 · DOI：10.1117/1.apn.3.3.036002 · 被引用次数：5 · 研究领域：Advanced Fiber Laser Technologies、Laser-Matter Interactions and Applications、Solid State Laser Technologies

Compressing all the energy of a laser pulse into a spatiotemporal focal cube edged by the laser center wavelength will realize the highest intensity of an ultra-intense ultrashort laser, which is called the λ3 regime or the λ3 laser. Herein, we introduced a rotational hyperbolic mirror—an important rotational conic section mirror with two foci—that is used as a secondary focusing mirror after a rotational parabolic mirror to reduce the focal spot size from several wavelengths to a single wavelength by significantly increasing the focusing angular aperture. Compared with the rotational ellipsoidal mirror, the first focal spot with a high intensity, as well as some unwanted strong-field effects, is avoided. The optimal focusing condition of this method is presented and the enhanced tight focusing for a femtosecond petawatt laser and the λ3 laser is numerically simulated, which can enhance the focused intensities of ultra-intense ultrashort lasers for laser physics.