Results 121 to 130 of about 88,044 (260)

Design and Development of an Optical Chip Interferometer For High Precision On-Line Surface Measurement [PDF]

Advances in manufacturing and with the demand of achieving faster throughput at a lower cost in any industrial setting have put forward the need for embedded metrology.
Kumar, Prashant
core   +2 more sources

Dual‐Comb Spectroscopy With Fully Controlled Repetition Rate and Offset Frequency of Quantum Cascade Laser Frequency Combs

Laser &Photonics Reviews, EarlyView.
Independent control of the repetition rate and offset frequency is demonstrated in quantum cascade laser frequency combs using radio‐frequency injection and thermal tuning. A revised comb model anchored at optical frequencies captures the unique behavior under radio‐frequency injection and enables precise frequency control.
Jie Liu, Philip Skochinski, Lawrence Hughes, Yamac Dikmelik, Kevin Lascola, Gerard Wysocki   +5 more
wiley   +1 more source

Low‐Crosstalk Silicon Photonic Switch Fabrics for AI Datacenters and High‐Capacity Optical Interconnects: Device‐Level Origins and Mitigation

Laser &Photonics Reviews, EarlyView.
Scaling silicon photonic switch fabrics for AI datacenters is fundamentally constrained by accumulated crosstalk, insertion loss, and device‐level non‐idealities. This work establishes a device‐to‐link‐to‐system framework that connects the physical origins of crosstalk to practical mitigation strategies across device, circuit, and control levels.
Peng Bao, Bohao Sun, Tianqian Zhang, Tongyun Li, Richard J. Zhang, Yue Lu, Chenxi Tan, Alan Yilun Yuan, Lingzhi Luo, Ming Luo, Jin Tao, Hanbing Li, Seb J. Savory, Wei Chu, Richard Penty, Qixiang Cheng   +15 more
wiley   +1 more source

Broadband Chromatic Dispersion of Thermo‐Refractive Coefficients and Its Impact in Silicon Nitride Nonlinear Photonics

Laser &Photonics Reviews, EarlyView.
Chromatic dispersion of material thermo‐refractive coefficients is characterized across an octave in integrated Si3N4${\rm Si}_3{\rm N}_4$/SiO2${\rm SiO}_2$ platforms. A 7% variation is observed from telecom to visible wavelengths, while incorporating this dispersion into multiphysics modeling captures frequency‐dependent resonance shifts and improves ...
Shao‐Chien Ou, Grégory Moille, Kartik Srinivasan   +2 more
wiley   +1 more source

Near‐Infrared Soliton Crystal Generation in Silicon Resonators

Laser &Photonics Reviews, EarlyView.
Near‐infrared Kerr soliton generation in silicon is severely hindered by two‐photon and free‐carrier absorption. By combining transverse‐mode dispersion engineering with active free‐carrier extraction, monolithic silicon resonators support densely spaced, low‐noise soliton‐crystal combs spanning over 100 nm and, in a separate device, broadband ...
Yue Qin, Keyi Zhong, Yaojing Zhang, Hon Ki Tsang   +3 more
wiley   +1 more source

Time‐Modulated Optomechanics Reveal Energy Flow and Inelastic Interactions Between Acoustic Phonons in Nanomembranes

Laser &Photonics Reviews, EarlyView.
Temporal interfaces are abrupt refractive index changes used in time‐varying optics, but also transitions to nonequilibrium states. This work explores the inelastic scattering of time‐varying light by nonthermal acoustic phonons in the vicinity of temporal interfaces.
Anuj Kumar Dhiman, Piotr Graczyk, Tobias Held, Mikolaj Pochylski, Kleoniki Sympoura, Rafal Bialek, Jacek Gapinski, Bahram Djafari Rouhani, Baerbel Rethfeld, Bartlomiej Graczykowski, Thomas Vasileiadis   +10 more
wiley   +1 more source

Demo 23-19 Microwave Interferometer

, 2001
An interferometer is constructed for use with 3-cm microwaves using the apparatus of Disc 21 Demonstration 14. A mesh screen at 45? with respect to the incoming beam, shown in Figure 1, functions as a half-silvered mirror.

core  

Toward Low‐Power Laser Refrigeration ‐ Cooling a Resonant WGM Crystalline Cavity

Laser &Photonics Reviews, EarlyView.
Laser refrigeration offers a method to cool solids to low temperatures by using only light. By illuminating bulk crystals doped with rare‐earth ions one can engineer the emitted fluorescent light to be at shorter wavelengths than the pump light ‐ thus extracting heat/phonons from the solid and cooling the crystals.
Jinjin Du, Rong Zhang, Zhenghan Yuan, Cyril Laplane, Luke S. Trainor, Harald G. L. Schwefel, Jason Twamley   +6 more
wiley   +1 more source

Evaluation and assimilation of Arctic Weather Satellite data in the AROME‐Arctic forecast system

Quarterly Journal of the Royal Meteorological Society, EarlyView.
The Arctic Weather Satellite (AWS), launched in August 2024, is a prototype for the future EPS–Sterna constellation of small satellites carrying an innovative microwave sounder. We present the first assessment of AWS in the regional AROME‐Arctic numerical weather prediction system, covering post‐launch calibration results and the impact of AWS ...
Stéphanie Guedj, Per Dahlgren, Máté Mile   +2 more
wiley   +1 more source

Satellite radiance observation error inflation and spatial thinning: Reconciling idealized theory with near‐operational applications

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Satellite radiance observations are spatially thinned using a grid‐based selection that retains one representative profile per cell. When observation errors are spatially correlated but treated as uncorrelated in the assimilation system, reducing thinning increases their influence, leading to overfitting and reduced analysis fit with other observations.
Joel Bedard, Alain Beaulne, Mark Buehner, Laurence Coursol   +3 more
wiley   +1 more source