Leibrandt David R, Thorpe Michael J, Notcutt Mark, Drullinger Robert E, Rosenband Till, Bergquist James C
National Institute of Standards and Technology, 325 Broadway St., Boulder, Colorado 80305, USA.
Opt Express. 2011 Feb 14;19(4):3471-82. doi: 10.1364/OE.19.003471.
We present an optical cavity design that is insensitive to both vibrations and orientation. The design is based on a spherical cavity spacer that is held rigidly at two points on a diameter of the sphere. Coupling of the support forces to the cavity length is reduced by holding the sphere at a "squeeze insensitive angle" with respect to the optical axis. Finite element analysis is used to calculate the acceleration sensitivity of the spherical cavity for the ideal geometry as well as for several varieties of fabrication errors. The measured acceleration sensitivity for an initial, sub-ideal version of the mounted cavity is 4.0(5)×10(-11)/g, 1.6(3)×10(-10)/g, and 3.1(1)×10(-10)/g (where g = 9.81 m/s2) for accelerations along the vertical and two horizontal directions, and the fractional frequency stability of a laser locked to the cavity is 1.2×10(-15) between 0.4 and 13 s. This low acceleration sensitivity combined with the orientation insensitivity that comes with a rigid mount indicates that this cavity design could allow frequency stable lasers to operate in non-laboratory environments.
我们提出了一种对振动和方向均不敏感的光学腔设计。该设计基于一个球形腔间隔器，它在球体直径上的两个点处被刚性固定。通过将球体相对于光轴保持在“挤压不敏感角度”，支撑力与腔长的耦合得以降低。有限元分析用于计算理想几何形状以及几种制造误差情况下球形腔的加速度灵敏度。对于安装好的腔的初始非理想版本，沿垂直方向和两个水平方向的加速度测量得到的加速度灵敏度分别为4.0(5)×10(-11)/g、1.6(3)×10(-10)/g和3.1(1)×10(-10)/g（其中g = 9.81 m/s2），并且锁定到该腔的激光器在0.4到13秒之间的分数频率稳定性为1.2×10(-15)。这种低加速度灵敏度与刚性安装带来的方向不敏感性相结合，表明这种腔设计可以使频率稳定的激光器在非实验室环境中运行。
