华东师范大学精密光谱科学与技术国家重点实验室, 上海 200062
通过将光学腔与外围热屏蔽层之间的热传递模型等效为多级电阻电容(RC)积分电路,计算得到光学腔的温度对外界环境温度变化的响应特性。用此方法探讨了当热屏蔽层的质量被限定时,热屏蔽层与光学腔的距离、热屏蔽层的层数和厚度对光学腔的温度响应特性的影响。分析结果表明,热屏蔽层与光学腔的距离从40 mm减小至5 mm,可使光学腔的温度响应时间增加1倍;当热屏蔽层的层数从1层增加至3层,且增加光学腔的最内层热屏蔽层的厚度,可使光学腔的温度对快速的环境温度变化的敏感度减小1个数量级以上。通过优化后的光学腔的热屏蔽层设计,有望提高锁定于光学腔的稳频激光的频率稳定度。
激光光学 激光稳频 光学法布里-珀罗腔 温度响应时间 热辐射
Author Affiliations
Abstract
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
The length stability of optical cavities is vital in ultra-stable, cavity-stabilized laser systems. Using finite element analysis, we study the length deviation of optical cavities due to thermal expansion and thermo-refractive effects when the incident light power is changed. The simulated fractional length sensitivity of a 7.75-cm-long football cavity to the power fluctuation of incident light is 5×10 14/μW, which is in agreement with the experimental results found by measuring the frequency change of a cavity-stabilized laser when the incident light power is changed. Based on the simulation, the cavity sensitivity to light power fluctuation is found to depend on the cavity size and material.
140.3425 Laser stabilization 140.4780 Optical resonators 120.2230 Fabry-Perot Chinese Optics Letters
2016, 14(10): 101401
