Fox Richard W
National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA.
Opt Express. 2009 Aug 17;17(17):15023-31. doi: 10.1364/oe.17.015023.
Temperature dependent structural distortion at the contacted mirrors of low-expansion glass cavities can introduce changes to the cavity length independent of the length of the spacer. There are resulting temperature sensitivities of the path (m/K) at each end of a cavity that are proportional to the difference of the coefficient of thermal expansion (alpha) at the contact. The temperature sensitivity of the resonant frequency can be a minimum at a temperature T(C) if the product of length times alpha(T(C)) of the spacer approximately offsets the combined sensitivities of the ends, even if alpha(T(C)) of the spacer is significantly nonzero.
低膨胀玻璃腔接触镜处与温度相关的结构变形会导致腔长变化，且与间隔物长度无关。腔两端路径的温度灵敏度（米/开尔文）与接触处热膨胀系数（α）的差值成正比。如果间隔物的长度乘以α（T(C)）的乘积大致抵消了两端的综合灵敏度，即使间隔物的α（T(C)）明显不为零，谐振频率的温度灵敏度在温度T(C)时也可能最小。
