{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T18:07:51Z","timestamp":1785434871221,"version":"3.56.0"},"reference-count":39,"publisher":"Optica Publishing Group","issue":"12","license":[{"start":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T00:00:00Z","timestamp":1780272000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR-OA"},{"start":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T00:00:00Z","timestamp":1780272000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"name":"Japan Society for the Promotion of Science (JSPS) KAKENHI","award":["25H00395"],"award-info":[{"award-number":["25H00395"]}],"id":[{"id":"https:\/\/ror.org\/00hhkn466","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Japan Society for the Promotion of Science (JSPS) KAKENHI","award":["23H01877"],"award-info":[{"award-number":["23H01877"]}],"id":[{"id":"https:\/\/ror.org\/00hhkn466","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Japan Science and Technology Agency (JST) PRESTO","award":["JPMJPR24L5"],"award-info":[{"award-number":["JPMJPR24L5"]}],"id":[{"id":"https:\/\/ror.org\/00097mb19","id-type":"ROR","asserted-by":"publisher"}]},{"name":"K Program","award":["JPMJKP24M4"],"award-info":[{"award-number":["JPMJKP24M4"]}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Express"],"published-print":{"date-parts":[[2026,6,15]]},"abstract":"<jats:p>\n                    The development of Fe:ZnSe-based mid-infrared laser amplification as an alternative to optical parametric chirped-pulse amplification has become increasingly important in high-intensity laser science, especially for high-harmonic generation toward higher photon energies. Here, we demonstrate a Fe:ZnSe chirped-pulse amplification architecture that combines a KTiOAsO\n                    <jats:sub>4<\/jats:sub>\n                    -based optical parametric amplifier (OPA) frontend providing 29-\n                    <jats:italic toggle=\"yes\">\u03bc<\/jats:italic>\n                    J, 4-\n                    <jats:italic toggle=\"yes\">\u03bc<\/jats:italic>\n                    m seed pulses, flashlamp-pumped erbium lasers as high-pulse-energy 3-\n                    <jats:italic toggle=\"yes\">\u03bc<\/jats:italic>\n                    m-class pump sources, and cladding-assisted suppression of transverse parasitic oscillation in the Fe:ZnSe crystals. The system delivers 4.1-\n                    <jats:italic toggle=\"yes\">\u03bc<\/jats:italic>\n                    m pulses at 5 Hz with an amplified energy of 6.7 mJ, a compressed energy of 4.7 mJ, and a pulse duration of 240 fs, while maintaining good beam quality and preserving an energy contrast of approximately 5000 in the amplified output. These results show that high-contrast, millijoule-level femtosecond Fe:ZnSe amplification can be achieved even with free-running flashlamp-pumped erbium lasers by reducing the required gain and number of passes through high-energy seeding. The demonstrated architecture provides a practical route toward further energy scaling of Fe:ZnSe-based 4-\n                    <jats:italic toggle=\"yes\">\u03bc<\/jats:italic>\n                    m femtosecond lasers, ultimately aiming at terawatt-class peak powers with larger-aperture homogeneous crystals.\n                  <\/jats:p>","DOI":"10.1364\/oe.600609","type":"journal-article","created":{"date-parts":[[2026,5,21]],"date-time":"2026-05-21T06:00:10Z","timestamp":1779343210000},"page":"21243","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Two-stage, triple-pass 5-mJ-level Fe:ZnSe chirped-pulse amplifier with a KTA-based OPA frontend and flashlamp-pumped erbium lasers"],"prefix":"10.1364","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7742-5726","authenticated-orcid":true,"given":"Daiki","family":"Okazaki","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0349bbg69","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuri","family":"Kirita","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0349bbg69","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Linpeng","family":"Yu","sequence":"additional","affiliation":[{"name":"National Institute for Fusion Science, National Institute of Natural Sciences"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1248-8122","authenticated-orcid":true,"given":"Tsuneto","family":"Kanai","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0349bbg69","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5377-637X","authenticated-orcid":true,"given":"Ryo","family":"Yasuhara","sequence":"additional","affiliation":[{"name":"National Institute for Fusion Science, National Institute of Natural Sciences"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shigeki","family":"Tokita","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0349bbg69","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,6,1]]},"reference":[{"key":"oe-34-12-21243-R1","doi-asserted-by":"publisher","first-page":"652","DOI":"10.1364\/AOP.454797","type":"journal-article","volume":"14","author":"Chang","year":"2022","journal-title":"Adv. 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