Wong E K, Notcutt M, Taylor C T, Mann A G, Blair D G
Appl Opt. 1997 Nov 20;36(33):8563-6. doi: 10.1364/ao.36.008563.
We show that temperature compensation based on differential thermal expansion between sapphire and fused silica can be used to create a Fabry-Perot cavity with an exceptionally low coefficient of thermal expansion at low temperatures. We describe the design of such a cavity that utilizes shaped fused silica mirrors and a sapphire spacer. The geometry of the fused silica mirror was designed using a finite element model to have a small platform, giving a frequency temperature turning point of 16.6 K. The measured turning point was 16.2 K and the curvature was 6 x 10(-10) K(-2), both of which were consistent with the model.
我们表明，基于蓝宝石和熔融石英之间的热膨胀差异进行温度补偿，可用于在低温下创建具有极低热膨胀系数的法布里 - 珀罗腔。我们描述了这种腔的设计，它利用了异形熔融石英镜和蓝宝石间隔物。使用有限元模型设计熔融石英镜的几何形状，使其具有一个小平台，频率温度转折点为16.6 K。测量得到的转折点为16.2 K，曲率为6×10⁻¹⁰ K⁻²，两者均与模型一致。
