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对核聚变等离子体密度测量用氰化氢激光外差于涉系统的激光器及测量方法进行了改进。使用Fabry-Perot型输出耦合器使激光器输出端具有最佳匹配的反射/透射系数,以达到最大功率输出。借助微机辅助反馈控制系统使激光器自动保持稳定的功率输出,达到长时运行无功率漂移,瞬间功率波动小于±1％,以CF_2=CH_2气体的337μm吸收线为基准,通过微机反馈控制使激光频率自动保持恒定,达到长时运行无频率漂移,瞬间频率波动小于±77kHz。提出了新的外差干涉位相变化的测量方法,直接从探测束求得与等离子体密度变化相应的相位变化而无需与参考束作比较,并简化了测量系统、除了初始位相问题,减轻了装置变位的影响。可测相移下限取决于时钟频率,上限无限制。
Laser fusion and measurement methods have been improved for the measurement of nuclear fusion plasma density using hydrogen cyanide laser heterodyne system. The Fabry-Perot output coupler is used to provide the best matching reflection / transmission coefficient at the laser output for maximum power output. With the help of computer-aided feedback control system, the laser can automatically maintain a stable power output and achieve long-term operation without power drift. The instantaneous power fluctuation is less than ± 1%. Based on the 337μm absorption line of CF_2 = CH_2 gas, Automatically maintain a constant, to achieve long-term operation without frequency drift, instantaneous frequency fluctuations less than ± 77kHz. A new method for measuring the phase change of heterodyne interference is proposed. The phase change corresponding to the plasma density change is obtained directly from the probe beam without the need of comparison with the reference beam, and the measurement system is simplified. Besides the initial phase problem, the device The impact of displacement. Measurable phase shift lower limit depends on the clock frequency, the upper limit is unlimited.