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 demonstrate long-distance (≥ 100-km) synchronization of the phase of a radio-
frequency reference over an optical-fiber network without needing to actively stabilize the …

A multi-wavelength interferometer utilizing the frequency comb of a femtosecond laser as the
wavelength ruler is tested for its capability of ultra-precision positioning for machine axis …

We present a frequency-sweeping heterodyne interferometer to measure an absolute
distance based on a frequency-tunable diode laser calibrated by an optical frequency comb …

Picometer laser interferometry is an essential tool for ultra-precision measurements in
frontier scientific research and advanced manufacturing. In this paper, we present a dual …

In this paper, we discuss 20-picometer-order mechanical step displacement measurements
using a heterodyne interferometer with a phase-locked loop (PLL) and two piezoelectric …

Precision measurement tools are compulsory to reduce measurement errors or machining
errors in the processes of calibration and manufacturing. The laser interferometer is one of …

In this paper, we present 10-pm-order mechanical displacement measurements using
heterodyne interferometry. The measuring system includes a single-path heterodyne …

We describe a new optical system using an ultra-stable mode-locked frequency comb
femtosecond laser and compressive sensing to measure an object's surface profile. The …

A novel signal processing method based on phase shift of reference signal is proposed for
heterodyne interferometer. The integer fringe counting method based on overflow judgment …