{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T08:07:41Z","timestamp":1787731661557,"version":"build-2784847793"},"reference-count":19,"publisher":"Optica Publishing Group","issue":"22","license":[{"start":{"date-parts":[[2025,11,13]],"date-time":"2025-11-13T00:00:00Z","timestamp":1762992000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR"},{"start":{"date-parts":[[2025,11,13]],"date-time":"2025-11-13T00:00:00Z","timestamp":1762992000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2023YFB3610604"],"award-info":[{"award-number":["2023YFB3610604"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Lett."],"published-print":{"date-parts":[[2025,11,15]]},"abstract":"<jats:p>\n                    We demonstrate a high-power picosecond long-wave infrared (LWIR) source based on type-II difference frequency generation (DFG) in ZnGeP\n                    <jats:sub>2<\/jats:sub>\n                    (ZGP) and BaGa\n                    <jats:sub>4<\/jats:sub>\n                    Se\n                    <jats:sub>7<\/jats:sub>\n                    (BGSe), pumped by a 2089.1\u2009nm laser at 10\u2009kHz repetition rate. When seeded by a double-pass optical parametric generator (OPG), the system delivers a record tabletop 1.91\u2009W idler output beyond 10\u2009\u03bcm from BGSe DFG under 56\u2009W total pump power. The type-II ZGP DFG stage alone generates 2.84\u2009W beyond 10\u2009\u03bcm, while cascading with BGSe boosts the average power to 3.31\u2009W, corresponding to 5.9% optical-to-optical conversion efficiency. The idler spectrum centers at 10.02\u2009\u03bcm with 278\u2009nm full-width at half-maximum (FWHM) bandwidth. With measured a 252.5\u2009ps pulse duration, the system achieves 1.31\u2009MW peak power and beam quality\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    \u2009=\u20093.64\/2.67 in x\/y directions. To our knowledge, this represents the highest average power reported from LWIR parametric sources beyond 10\u2009\u03bcm.\n                  <\/jats:p>","DOI":"10.1364\/ol.576423","type":"journal-article","created":{"date-parts":[[2025,10,20]],"date-time":"2025-10-20T13:00:12Z","timestamp":1760965212000},"page":"7143","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["3.3\u2009W picosecond LWIR generation via ZnGeP\n                    <sub>2<\/sub>\n                    and BaGa\n                    <sub>4<\/sub>\n                    Se\n                    <sub>7<\/sub>\n                    difference frequency generation"],"prefix":"10.1364","volume":"50","author":[{"given":"Jinwen","family":"Tang","sequence":"first","affiliation":[{"name":"Harbin Institute of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhitai","family":"Zhou","sequence":"additional","affiliation":[{"name":"Harbin Institute of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoxiao","family":"Hua","sequence":"additional","affiliation":[{"name":"Harbin Institute of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minglang","family":"Wu","sequence":"additional","affiliation":[{"name":"Harbin Institute of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenhao","family":"Cheng","sequence":"additional","affiliation":[{"name":"Harbin Institute of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wentian","family":"Wu","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Baoquan","family":"Yao","sequence":"additional","affiliation":[{"name":"Harbin Institute of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiyong","family":"Yao","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tongyu","family":"Dai","sequence":"additional","affiliation":[{"name":"Harbin Institute of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2025,11,13]]},"reference":[{"key":"ol-50-22-7143-R1","doi-asserted-by":"publisher","first-page":"11156","DOI":"10.1364\/AO.410053","type":"journal-article","volume":"59","author":"Melkonian","year":"2020","journal-title":"Appl. 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All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}