Knowledge Bank

“Through the use of crystalline germanium plates it is possible to construct Fabry-Perot etalons which are capable of dispersion measurements in the 2-22 $\mu$ region of the infrared. Moreover, such measurements can be carried out with conventional spectrometers and nominal temperature control. Using the interferometers, the refractive indices of carbon disulfide, carbon tetrachloride, chloroform, cyclohexane and perfluoro 1, 3, 5-trimethylcyclohexane have been measured with an accuracy of $\pm$ 0.003.”