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An ultraprecision system to evaluate the periodic error of linear encoders (PEL) has been developed. Our system is based on a homodyne laser interferometer as a reference scale. Conventional studies which used an interferometer with unknown periodic error resulted in insufficient reliability because the periodic error of an interferometer (PEI) directly overlaps on the evaluated PEL. In this study,...
We developed a prism-pair interferometer which measures precise refractive index of glasses while ensuring the SI-traceability of a lamp wavelength. The measurement result agrees with manufacture's value within 1×10−5.
Interferometer for precise refractive-index measurement of glass-prism without prior knowledge is developed using a direct comparison of optical-path-changes in glass and air. Preliminary result shows uncertainty of 4.4 x 10-5 agreeing with the manufacturer’s values.
We demonstrate the potential of femtosecond two-color pulse interferometry for in vitro optical glucose monitoring, by dispersion of the group refractive index in a glucose solution sample with respect to a red-color light and a blue-color light. By comparison with femtosecond one-color pulse interferometry, the basic performance of the present system with regard to sensitivity, quantitativeness,...
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