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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 \u03bcm\u2014over 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 Schr\u00f6dinger 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.<\/jats:p>","DOI":"10.1126\/sciadv.aed5357","type":"journal-article","created":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T18:01:42Z","timestamp":1792605702000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Towards intense single-digit attosecond pulses with a 100-mJ-class mid-infrared sub-cycle laser"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2403-1499","authenticated-orcid":true,"given":"Kaito","family":"Nishimiya","sequence":"first","affiliation":[{"name":"Extreme Photonics Research Team, RIKEN Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 Japan."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2196-6133","authenticated-orcid":true,"given":"Rambabu","family":"Rajpoot","sequence":"additional","affiliation":[{"name":"Extreme Photonics Research Team, RIKEN Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 Japan."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1672-1171","authenticated-orcid":true,"given":"Eiji J.","family":"Takahashi","sequence":"additional","affiliation":[{"name":"Extreme Photonics Research Team, RIKEN Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 Japan."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1103\/RevModPhys.78.309"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1017\/hpl.2019.36"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1103\/RevModPhys.81.163"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41566-022-00961-9"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.92.063902"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1038\/nphys338"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1364\/AO.1.000033"},{"key":"e_1_3_2_9_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature06229"},{"key":"e_1_3_2_10_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-021-03678-x"},{"key":"e_1_3_2_11_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.71.1994"},{"key":"e_1_3_2_12_2","first-page":"2528351","article-title":"Advances in dual-chirped optical parametric amplification","volume":"10","author":"Nishimiya K.","year":"2025","unstructured":"K. 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