Frequency‐stabilized single‐mode cw 118.8‐μm CH3OH waveguide laser for large tokamak diagnostics
Frequency‐stabilized single‐mode cw 118.8‐μm CH3OH waveguide laser for large tokamak diagnostics
复制标题
用于大型托卡马克诊断的稳频单模连续波 118.8 µm CH3OH 波导激光器
DOI：
10.1063/1.1140321
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发表时间：
1989
影响因子：
1.6
通讯作者：
A. Nagashima
中科院分区：
文献类型：
--
作者：
T. Fukuda;A. Nagashima
在JT-60托卡马克装置上研制了一台用于偏振干涉测量的118.8 μm甲醇波导稳频单模连续激光器。大型聚变装置上的干涉等离子体诊断需要源激光器的模式纯度用于长距离传播和频率稳定性，以获得足够的条纹分辨率。实现的性能是Δf/f<1×10−8，功率稳定性<0.03%，并且单个EH 11模式在远场产生高斯形轮廓。利用Ge标准具光束耦合器对激光介质进行均匀泵浦和反馈稳定性控制是大型托卡马克诊断所需的源远红外激光器性能的关键。所开发的激光器在超过2周的时间内完全无需调整，并可靠地运行了2年，包括JT-60托卡马克上的真实的电子密度反馈控制。
A frequency‐stabilized single‐mode cw 118.8‐μm CH3OH waveguide laser was newly developed for polari‐interferometry on the JT‐60 tokamak. Interferometric plasma diagnostics on large fusion devices requires a mode purity of a source laser for the long‐distance propagation and frequency stability to obtain an adequate fringe resolution. The accomplished performances are Δf/f<1×10−8, power stability <0.03%, and single EH11 mode to yield a Gaussian‐shaped profile in the far field. Homogeneous pumping of laser media with a Ge etalon beam coupler and feedback stability control are the keys to the source far‐infrared laser performances required for large tokamak diagnostics. The developed laser was totally adjustment free for more than 2 weeks and reliably in operation for 2 years, including the real‐time electron density feed‐back control on the JT‐60 tokamak.