Interferometry is a measurement technique that exploits the superposition of coherent waves, typically electromagnetic or matter waves, to extract precise information from the resulting interference pattern. By splitting a wavefront into multiple paths that traverse different optical or physical conditions and then recombining them, interferometry enables highly sensitive determination of path length differences, refractive index variations, surface topography, displacements, and phase shifts. It underpins applications such as optical metrology, gravitational wave detection, astronomical aperture synthesis, and coherence characterization, with performance determined by factors including coherence length, phase stability, wavelength, and environmental noise control.
A new, miniature laser source developed by applied physicists in the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) and the Technical University of Vienna (TU Wien) could soon pack the power of ...
Optics & Photonics
Mar 31, 2026
0
26
The nature of quantum particles has long puzzled scientists. While single-particle interference suggests that a photon can behave like a spread-out wave, a whole photon is only ever detected in one specific place. Traditional ...
Optics & Photonics
Mar 26, 2026
0
187
Cerebral blood flow is essential for normal brain function and often perturbed in neurological disease. If one shines a source of coherent light on perfused tissue, the detected speckles, or "grains" of light fluctuate, or ...
Optics & Photonics
Mar 14, 2026
0
44
Researchers in the US have demonstrated how quantum entanglement could be used to detect optical signals from astronomical sources at the single-photon level. Published in Nature, a team led by Pieter-Jan Stas at Harvard ...
Stanford researchers have combined two microscopy techniques to create a one-of-a-kind instrument that can show cell structures interacting in real time at an unprecedented 120-nanometer resolution—the highest achieved without ...
Cell & Microbiology
Mar 4, 2026
0
386
To capture higher-definition and sharper images of cosmological objects, astronomers sometimes combine the data collected by several telescopes. This approach, known as long-baseline interferometry, entails comparing the ...
Lasers, devices that emit intense beams of coherent light in specific directions, are widely used in research settings and are central components of various technologies, including optical clocks (i.e., systems that can keep ...
Efficient generation and reliable distribution of quantum entangled states is crucial for emerging quantum applications, including quantum key distribution (QKDs). However, conventional polarization-based entanglement states ...
Optics & Photonics
Feb 17, 2026
0
49
As quantum computers continue to advance, many of today's encryption systems face the risk of becoming obsolete. A powerful alternative—quantum cryptography—offers security based on the laws of physics instead of computational ...
Optics & Photonics
Feb 9, 2026
0
182
Modern technologies increasingly rely on light sources that can be reconfigured on demand. Think of microlasers that can quickly switch between different operating states—much like a car shifting gears—so that an optical ...
Optics & Photonics
Feb 9, 2026
0
26
