High-accuracy interferometer with a prism pair for measurement of the absolute refractive index of glass.
We propose a variable-path interferometric technique for the measurement of the absolute refractive index of optical glasses. We use two interferometers to decide the ratio between changes in the optical path in a prism-shaped sample glass and in air resulting from displacement of the sample. The method allows precise measurements to be made without prior knowledge of the properties of the sample. The combined standard uncertainty of the proposed method is 1.6x10(-6).
National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan. y-hori@aist.go.jp
Yasuaki
Y
Hori
Akiko
A
Hirai
Kaoru
K
Minoshima
Hirokazu
H
Matsumoto