近日，韩国光州基础科学研究所的Chang Hee Nam&Jae Hee Sung及其研究团队取得一项新进展。经过不懈努力，他们利用多拍瓦激光实现全光非线性康普顿散射。相关研究成果已于2024年10月14日在国际知名学术期刊《自然—光子学》上发表。

该研究团队展示了强激光场中非线性康普顿散射的实验演示，其中一束由激光加速产生的多吉电子伏特电子散射了数百个激光光子，并将其转换为一个能量达数百兆电子伏特的伽马射线光子。

结合单元内粒子（PIC）-QED模拟和解析计算，研究人员对伽马射线光谱的实验测量，证实了强非线性条件下康普顿散射的发生，为探索非线性布雷特-惠勒对产生和QED级联效应铺平了道路。

据悉，由超高强度激光驱动的光与物质相互作用具有巨大潜力，能够揭示中子星和黑洞中发生的量子电动力学（QED）过程的相关物理学。超相对论电子束与强激光之间的康普顿散射，可以揭示一种被称为强场QED的新相互作用机制。

附：英文原文

Title: All-optical nonlinear Compton scattering performed with a multi-petawatt laser

Author: Mirzaie, Mohammad, Hojbota, Calin Ioan, Kim, Do Yeon, Pathak, Vishwa Bandhu, Pak, Tae Gyu, Kim, Chul Min, Lee, Hwang Woon, Yoon, Jin Woo, Lee, Seong Ku, Rhee, Yong Joo, Vranic, Marija, Amaro, scar, Kim, Ki Yong, Sung, Jae Hee, Nam, Chang Hee

Issue&Volume: 2024-10-14

Abstract: Light–matter interactions driven by ultrahigh-intensity lasers have great potential to uncover the physics associated with quantum electrodynamics (QED) processes occurring in neutron stars and black holes. The Compton scattering between an ultra-relativistic electron beam and an intense laser can reveal a new interaction regime, known as strong-field QED. Here we present an experimental demonstration of nonlinear Compton scattering in a strong laser field, in which a laser-accelerated multi-gigaelectronvolt electron scatters off hundreds of laser photons and converts them into a single gamma-ray photon with several-hundred-megaelectronvolt energy. Along with particle-in-cell (PIC)-QED simulations and analytical calculations, our experimental measurement of gamma-ray spectra verifies the occurrence of Compton scattering in the strongly nonlinear regime, paving the road to examine nonlinear Breit–Wheeler pair production and QED cascades.

DOI: 10.1038/s41566-024-01550-8

Source: https://www.nature.com/articles/s41566-024-01550-8