Nondestructive measurement of the refractive index distribution of a glass molded lens by two-wavelength wavefronts.
This paper presents a nondestructive and non-exact-index-matching method for measuring the refractive index distribution of a glass molded lens with high refractivity. The method measures two-wavelength wavefronts of a test lens immersed in a liquid with a refractive index dispersion different from that of the test lens and calculates the refractive index distribution by eliminating the refractive index distribution error caused by the shape error of the test lens. The estimated uncertainties of the refractive index distributions of test lenses with nd≈1.77 and nd≈1.85 were 1.9×10-5RMS and 2.4×10-5RMS, respectively. I validated the proposed method by evaluating the agreement between the estimated uncertainties and experimental values.
Tomohiro
T
Sugimoto