Parker C J, Popov W A
Appl Opt. 1971 Sep 1;10(9):2137-43. doi: 10.1364/AO.10.002137.
With the Fizeau interferometer method, the change in optical path length with temperature is measured at six wavelengths for twenty new Corning optical glasses. The sample, a polished block with a few seconds of wedge, is held in a double-walled chamber with temperature control provided over the range -20 degrees C to +80 degrees C by a circulating water-glycol mixture. A Gaertner interferometer viewing apparatus is modified by addition of a monitor head that permits simultaneous photoelectric fringe detecting and viewing. Measurement of thermal expansion with the Plummer-Hagy high precision dilatometer permits the extraction of the temperature coefficient of absolute refractive index from the optical path measurement. The coefficient of refractive index relative to standard air at the temperature of the glass is found by further data reduction using Edlén's equations. The experimental values of the index change as a function of temperature are curve-fitted by a FORTRAN program, and the slopes are computed to give instantaneous values of the coefficients. The average residual for the fit is about 1.0 x 10(-6). The precision of the absolute coefficient values is estimated to be +/-0.05 x 10(-6). Representative data for one glass are presented to illustrate the results available from this work.
采用菲佐干涉仪法，对20种新型康宁光学玻璃在6个波长下测量了光程长度随温度的变化。样品是一块带有几秒钟楔形的抛光块，置于一个双壁腔室中，通过循环水 - 乙二醇混合物在 -20℃至 +80℃范围内进行温度控制。通过添加一个允许同时进行光电条纹检测和观察的监测头，对盖特纳干涉仪观察装置进行了改进。使用普卢默 - 哈吉高精度膨胀仪测量热膨胀，从而可以从光程测量中提取绝对折射率的温度系数。通过使用埃德尔恩方程进行进一步的数据处理，得出玻璃温度下相对于标准空气的折射率系数。通过一个FORTRAN程序对折射率随温度变化的实验值进行曲线拟合，并计算斜率以给出系数的瞬时值。拟合的平均残差约为1.0×10⁻⁶。绝对系数值的精度估计为±0.05×10⁻⁶。给出了一种玻璃的代表性数据来说明这项工作可得到的结果。
