{"title":"Simultaneous Triple-Wavelength Operation of a Diode-Pumped Nd: GSAG Laser at 1.4 μm","authors":"Haotian Huang;Jing Xia;Rui Yang;Nguyentuan Anh;Yuzhao Li;Yanfei Lü","doi":"10.1109/LPT.2026.3669098","DOIUrl":"https://doi.org/10.1109/LPT.2026.3669098","url":null,"abstract":"We present a Nd:Gd3Sc2Al3O12(Nd:GSAG) laser operating at three wavelengths via the 4F3/2 → 4I13/2 transition. The gain-to-loss balance condition for simultaneous triple-wavelength operation was analyzed numerically using a birefringent filter (BRF). Experimentally, a continuous-wave (CW) emission at 1402 nm, 1426 nm and 1440 nm was demonstrated. Under an incident pump power of 20 W at 808 nm, the laser obtained a maximum total output power of 2.23 W, corresponding to an optical-to-optical conversion efficiency of 11.2%. To the best of our knowledge, this study theoretically establishes, for the first time, the equal-threshold condition for simultaneous operation of a triple-wavelength laser using a single loss element.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 11","pages":"755-758"},"PeriodicalIF":2.5,"publicationDate":"2026-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147362308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}