2026-10-22 理化学研究所
サブサイクルレーザーによるアト秒パルス発生の概念図
＜関連情報＞
- https://www.riken.jp/press/2026/20261022_1/index.html
- https://www.science.org/doi/10.1126/sciadv.aed5357
100mJクラスの中赤外サブサイクルレーザーによる、高強度な1桁アト秒パルスの実現に向けて Towards intense single-digit attosecond pulses with a 100-mJ-class mid-infrared sub-cycle laser
Kaito Nishimiya, Rambabu Rajpoot, and Eiji J. Takahashi
Science Advances Published:21 Oct 2026
DOI:https://doi.org/10.1126/sciadv.aed5357
Abstract
The duration of isolated attosecond pulses created via high-order harmonic generation is determined by the number of optical cycles in the driving laser. Achieving shorter attosecond soft x-ray pulses requires minimizing the number of cycles while maintaining a high pulse energy. Here, we demonstrate a carrier-envelope-phase-stable, 100-mJ-class sub-cycle mid-infrared laser that produces a supercontinuum coherent soft-x-ray with unprecedented bandwidth. The system delivers 50-mJ, 6.7-fs (0.88-cycle) pulses at a center wavelength of 2.26 μm—over two orders of magnitude more energetic than any previous sub-cycle laser. We applied the system to high-order harmonic generation and compared the results to simulations based on the three-dimensional time-dependent Schrödinger equation to identify unique features of sub-cycle lasers. This work represents a decisive step toward high-energy half-cycle lasers and high-energy single-digit attosecond soft x-ray pulses that can be used to probe matter and light-matter interactions at previously inaccessible temporal resolutions.
