{"title":"High-Speed Water-Cooled Rotary Solid-State Laser With Reduced Thermal Effects","authors":"Zhuanglin Qian;Minghai Wang;Xuan Lv;Ying Wang;Peifeng Chen","doi":"10.1109/LPT.2025.3551131","DOIUrl":"https://doi.org/10.1109/LPT.2025.3551131","url":null,"abstract":"This study introduces a high-speed water-cooled rotary laser with an innovative cooling mechanism. Thermal analysis confirms the system’s exceptional heat dissipation capabilities. Compared to traditional rotary disk lasers, this laser fully utilizes high thermal conductivity efficiency of water cooling and low absorption coefficient of the gain medium to reduce thermal stress. We introduce a novel “quasi-rotation” mechanism for the water-cooled rotary laser to resolve the issue of water pipe entanglement. To achieve this, we propose an eccentric rotation design that utilizes a single motor to deliver uniform, high-speed rotation with exceptional stability. Initial experiments demonstrate a maximum output power of 76.5 W, a slope efficiency of 58.2%, and a power conversion efficiency of 52.4%. Output power is primarily limited by the available pump power in our lab. We also analyze the impact of water temperature and rotation speed on output power. Both continuous and pulsed pumping experiments further validate the system’s robust thermal management. Overall, our results highlight the significant potential of “quasi-rotating” water-cooled laser technology to enhance the power output of solid-state lasers.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 7","pages":"429-432"},"PeriodicalIF":2.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654920","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}
Lei Zhang;Hongzhe Ouyang;Yaxin Yu;Jiao Zhang;Min Zhu;Shengbao Wu;Jinbiao Xiao
{"title":"A Polarization-Insensitive 3 dB Power Splitter Based On Inverse-Designed Subwavelength Pixelated Structure","authors":"Lei Zhang;Hongzhe Ouyang;Yaxin Yu;Jiao Zhang;Min Zhu;Shengbao Wu;Jinbiao Xiao","doi":"10.1109/LPT.2025.3550542","DOIUrl":"https://doi.org/10.1109/LPT.2025.3550542","url":null,"abstract":"The polarization-independent power splitters (PIPSs) are essential for enabling efficient integration in photonic circuits. In this letter, we propose and experimentally demonstrate an ultra-compact, broadband 3 dB PIPS, whose design is based on a sub-wavelength pixelated structure with a footprint of <inline-formula> <tex-math>$2.5times ,, 1.5~mu $ </tex-math></inline-formula>m2. The initial pixelated structure is carefully designed to enhance algorithm robustness of the optimization process, thereby improving efficiency and avoiding local optima. The experimental results show that the insertion loss of both TE0 and TM0 is lower than 1.5 dB within the wavelength range of 1480-1580 nm, while the beam splitting ratio between the two output ports remains above 75%. In addition, the fabrication tolerance of the device is examined to ensure low insertion loss and reflection loss. This ultra-compact on-chip device demonstrates significant potential for advancing high-density integration in optical circuits.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 7","pages":"433-436"},"PeriodicalIF":2.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654907","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}
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