We present a progress review on the advance of distance measurements made at KAIST by
making use of mode-locked lasers as the light source to meet ever-growing industrial …

Compact interferometers, called phasemeters, make it possible to operate over a large
range while ensuring a high resolution. Such performance is required for the stabilization of …

We review the progress made for compensation of the refractive index of air in laser-based
distance measurements in the field of precision engineering. First, a comprehensive …

We report a novel and simple method to generate a pair of self-mixing signals with
quadrature phase difference in He-Ne laser by introducing a wedge into the external cavity …

The choice of fitting methods for elliptically scattered data obtained with displacement-
measuring homodyne quadrature laser interferometers significantly influences the accuracy …

We propose a nanometer-scale displacement or vibration measurement system, using an
optical quadrature interferometer and the post-processing technique that extracts the …

A linearization method with improved robustness for determining the displacement from sine
and cosine signals generated by optical encoders is presented. The proposed scheme is …

We present a phase-locked synthetic wavelength interferometer that enables a complete
elimination of cyclic errors in absolute distance measurements. With this method, the phase …

We present a fast, displacement-measuring, single-pass, two-detector homodyne
quadrature laser interferometer and compare its performance with an arm-compensated …

A novel grating interferometer configuration with eightfold optical subdivision to achieve
ultrahigh resolution using a special symmetrical prism is proposed. The optical subdivision …