OPOS公司
材料科学
激光器
光学参量振荡器
光学
钬
光电子学
光抽运
波长
物理
作者
Miftar Ganija,Keiron Boyd,Alexander Hemming,Neil Carmody,Nikita Simakov,P. J. Veitch,Jesper Munch
出处
期刊:European Quantum Electronics Conference
日期:2021-06-21
标识
DOI:10.1109/cleo/europe-eqec52157.2021.9542744
摘要
High energy laser sources operating around 2 µm are of interest in a variety of applications: LIDAR, material processing, medicine and pump sources for optical parametric oscillators (OPOs) for high-energy mid-IR nonlinear conversion. The OPO approach using ZGP is a scalable route for generating mid-IR radiation. In order to achieve high energy output, a pump source with wavelengths above 2.05 µm and excellent beam quality is required. Different laser configurations using Ho:YLF and Ho:YAG at room temperature have been used, but with thermal issues such as thermo-optical and mechanical properties being the major limitations. Cryogenic cooling results in drastic improvements in the thermos-optical and mechanical properties of YLF and YAG. Additionally, changes in the holmium ion population distribution creates a near four-level material, enabling larger mode volumes to be pumped and a significant reduction of the laser threshold in comparison to room temperature operation [1] , [2] . The value of cryogenic cooling was demonstrated as early as the 1980s, where Ho 3+ in YAG and YLF flash-pumped in co-doped scenario were reported [3] , [4] . High energy resonantly pumped Ho:YLF operating at cryogenic temperatures were reported by H. Fonnum et. al [5] , with <1 W average power.
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