Responding to the urgency of remote sensing for monitoring large concentrations of methane leakage, a high-speed modulation continuous laser methane leakage remote methodology based on a near-infrared single-photon avalanche diode

An ultrasonic phase extraction method is proposed for co-cable identification without modifying transceivers in coherent optical transmission systems. To extract the ultrasonic phase, we apply an improved residual frequency offset

A high-birefringence fiber, Tb:YAG crystal-derived silica fiber (TYDSF), was fabricated by CO2 laser-heating drawing technique. Its linear birefringence was 2.99 × 10-5, and it was used to fabricate an all-fiber quarter-wave plate

We propose a photonic frequency-multiplied vector millimeter-wave (mmW) signal generation scheme based on constant-envelope delta-sigma modulation (CE-DSM). The CE characteristic of phase modulation can easily avoid intensity-depe

We have prepared kilometer-scale low-loss hollow-core nested anti-resonant nodeless fibers by improving their structural design, which reduces the difficulty of fabricating low-loss hollow-core fibers over long distances. The lowe

Motion blur restoration is essential for the imaging of moving objects, especially for single-pixel imaging (SPI), which requires multiple measurements. To reconstruct the image of a moving object with multiple motion modes, we pr

Topological valley photonics has recently gained widespread interest owing to its robustness and backscattering immunity against disorders. Previous topological valley transport based on kink states required an interface between t

The high-sensitivity three-axis detection of magnetic fields is widely used in various applications. Our study demonstrates an atomic magnetometer detecting vector magnetic field, of which the core components are one glass cell an

Micromagnets, as a promising technology for microscale manipulation and detection, have been the subject of extensive study. However, providing real-time, noninvasive feedback on the position and temperature of micromagnets in com

A broadband gas sensing technology is reported. The measurement principle relies on Fourier transform photoacoustic spectroscopy (FT-PAS) using a differential photoacoustic cell, in which both phase modulation and amplitude modula

We theoretically and experimentally demonstrate a cylinder-shaped hole array with a small depth and an appropriate period integrated on a silicon-on-insulator substrate can enhance infrared absorption due to more bending of light

In this study, a miniature laser frequency stabilization module for cold atom sensing applications was designed and realized. The module can lock the laser frequency to the saturated absorption spectrum of the D2 line of rubidium

In this Letter, we realized the phonon-assisted Q-switched laser operation in Yb:YCOB crystal. Differing from previous laser wavelengths below 1.1 µm, we extended the wavelength to 1130 nm by amplifying multiphonon-assisted electr

By combining the thermally-induced spectral broadening of Er3+/Yb3+ co-doped crystal and the high ratio of cavity gain to loss, a high-power broadband continuously tunable 1.5-1.6 µm laser was successfully demonstrated in an Er:Yb

We explore for the first time the real-time spectra of dissipative soliton (DS) and noise-like pulse (NLP) inter-switching by adjusting the pump power, as well as the dual-pulse collision dynamics for three modes: dual-NLP, NLP-DS

We demonstrate, for the first time and to the best of our knowledge, a continuous-wave and broadly tunable Cr:ZnSe bulk crystal laser pumped by a Tm:YLF bulk laser with 1845 nm and 1887 nm wavelengths. We compare the output charac

The diffractive optical element (DOE) is an important component of three-dimensional (3D) imaging systems based on structured light. In this work, we designed the metasurface-driven DOEs based on generalized Rayleigh–Sommerfeld di

The study of strong coupling between photonic cavities and excitons has brought about significant advances, varying from fundamental physics to applied science. However, there are several challenges hindering its further developme

Free-space diffractive neural networks (DNNs) have been an intense research topic in machine learning for image recognition and encryption due to their high speed, lower power consumption, and high neuron density. Recent advances

A simple and robust multiple wavelength frequency stabilization system is demonstrated using a single transfer cavity and a 1062-nm ultra-stable laser for all the lasers used in a mercury optical lattice clock. Offset sideband loc

The X-ray free-electron laser (XFEL), a new X-ray light source, presents numerous opportunities for scientific research. Self-amplified spontaneous emission (SASE) is one generation mode of XFEL in which each pulse is unique. In t