Author(s): Jinke Xiong, Hanghua Xu, Liangliang Ji, Chao Feng, and Zhentang Zhao We introduce a novel and reliable approach too generate high-energy photon pulse bursts in both the attosecond and zeptosecond regimes ($1\text{ }\text{as}={10}^{−18}\text{ }\text{s};1\text{ }\text{zs}={10}^{−21}\text{ }\text{s}$), high-energy photon pulse bursts by synergistically exploiting the in… [Phys. Rev. Lett. 137, 043803] Published Wed Jul 22, 2026