This paper presents an open and flexible digital phase-locked loop optimized for laser
stabilization systems. It is implemented on a cheap and easily accessible FPGA-based …

Deep-frequency-modulation interferometry combines optical minimalism with multifringe
readout. However, precision is key for applications such as optical gradiometers for satellite …

Laser interferometry with pm/Hz precision and multi-fringe dynamic range at low frequencies
is a core technology to measure the motion of various objects (test masses) in space and …

Distance measurement based on the accumulated phase of intensity-modulated continuous-
wave lasers is an established approach for pointwise geometry acquisition in uncontrolled …

Digitally enhanced heterodyne interferometry (DEHI) combines the sub-wavelength
displacement measurements of conventional laser interferometry with the multiplexing …

Experiments for space and ground-based gravitational wave detectors often require a large
dynamic range interferometric position readout of test masses with 1 pm/Hz precision over …

This paper reports an innovative heterodyne Wollaston laser encoder with common-optical-
path (COP) configuration for the measurement of in-plane displacement. The proposed …

Optical feedback or self-mixing interferometry technique has been widely used for sensing
vibration, displacement, velocity, distance and flow applications. Such applications require …

We present a free-space, continuous-wave laser interferometric system capable of multi-
target dynamic phase measurement at acoustic frequencies up to a Nyquist bandwidth of …

Laser interferometer with picometer precision is a key technology in the space gravitational
wave detection. Many interferometry strategies have been put forward for the multiple …