Results 81 to 90 of about 525,841 (267)

1970 W 1030 nm Single-Mode All-Fiber Master Oscillator Power Amplifier with ~3.2 GHz Linewidth Based on Ultra-Low NA Active Fiber

Photonics
A high-power narrow-linewidth fiber laser with single-mode beam quality is experimentally demonstrated. By employing a cascaded phase modulation strategy, the stimulated Brillouin scattering (SBS) threshold of the laser is effectively increased from 973 ...
Yang Liu, Xiaoyong Xu, Mengfan Cui, Wei Li, Chongwei Wang, Yan Peng, Junjie Zheng, Zilun Chen, Yisha Chen, Wei Liu, Hu Xiao, Zefeng Wang, Pengfei Ma   +12 more
doaj   +1 more source

Narrow-linewidth Fano microcavities with resonant subwavelength grating mirror

We report on the theoretical and experimental investigations of optical microcavities consisting in the plane-plane arrangement of a broadband high-reflectivity mirror and a suspended one-dimensional grating mirror possessing a high-quality factor Fano ...
Trishala Mitra (17944121), Gurpreet Singh (1291665), Ali Akbar Darki (11958302), Søren Peder Madsen (9449389), Aurélien Dantan (14405856)   +4 more
core   +1 more source

Surface‐Spin‐Induced Magnetic Loss Enhancement in Ultralight Electromagnetic Absorbers

Advanced Science, EarlyView.
Fe3O4 nanoparticles with different hollow rates were synthesized to demonstrate the key role of surface moment in magnetic loss process. Using the same volume filling ratio, the 54.1% hollow Fe3O4 absorber represents about 20% enhancement in the imaginary part (μ'') than solid particles due to the coexisting magnetic resonance of inside and outside ...
Ruimin Ren, Ke Yang, Chichong Lu, Song Ma, Bowen Zheng, Zhenhui Ma   +5 more
wiley   +1 more source

Pattern‐Aware Intelligence Enables Nondestructive, Rapid Quantification of High‐Aspect‐Ratio Silicon Etching

Advanced Science, EarlyView.
Pattern‐dependent etching is converted into a physical prior for intelligent reconstruction of high‐aspect‐ratio silicon structures. Combining YOLO‐Pose feature extraction with a topography network, the framework retrieves depth, sidewall angle, and scallop texture from minimal destructive observations, enabling accurate cross‐scale metrology and near ...
Shuyan He, Lang Chen, Bo Wen, Yufeng Jin, Wei Wang   +4 more
wiley   +1 more source

Millisecond Spin Relaxation Times of Distinct Electron and Hole Subensembles in MAxFA1−xPbI3 Perovskite Crystals

Advanced Science, EarlyView.
Mixed‐cation MAx${\rm MA}_x$ FA1−x${\rm FA}_{1-x}$ PbI3${\rm PbI}_3$ perovskite crystals reveal multiple discrete electron and hole spin subensembles associated with distinct localization environments. Optically detected magnetic resonance combined with resonant spin inertia uncovers carriers spin relaxation times reaching 2 ms and identifies nuclear ...
Rongrong Hu, Sergey R. Meliakov, Dmitri R. Yakovlev, Bekir Turedi, Maksym V. Kovalenko, Manfred Bayer, Vasilii V. Belykh   +6 more
wiley   +1 more source

Sub-megahertz narrow linewidth VCSELs with monolithic extended cavity [PDF]

APL Photonics
We demonstrate a monolithic extended-cavity vertical-cavity surface-emitting laser (VCSEL) achieving a linewidth of 890 kHz, which, to our knowledge, ranks among the narrowest reported for this class of lasers.
Yongli Wang, Chuanchuan Li, Yang Zhang, Jian Li, Xin Wei   +4 more
doaj   +1 more source

Piezoelectrically tunable, narrow linewidth photonic integrated extended-DBR lasers [PDF]

Recent advancements in ultra-low-loss silicon nitride (Si3N4)-based photonic integrated circuits have surpassed fiber lasers in coherence and frequency agility.
Siddharth, Anat, Voloshin, Andrey S., Qiu, Zheru, Lihachev, Grigory, Kenning, Scott, Riemensberger, Johann, Attanasio, Alaina, Bianconi, Simone, Zhang, Junyin, Bancora, Andrea, Wang, Rui Ning, Kippenberg, Tobias, Kippenberg, Tobias J., Voloshin, Andrey, Bhave, Sunil A.   +14 more
core   +1 more source

Green and Scalable Synthesis of Efficient and Stable CsPbBr3 Perovskite Quantum Dots Enables Low‐Threshold Amplified Spontaneous Emission

Advanced Science, EarlyView.
Green and scalable synthesis of CsPbBr3 perovskite quantum dots using bio‐sourced lecithin and hexane enables single‐batch production over 10 grams. Suppressed Auger recombination and electron‐phonon coupling yields 95% PLQY, enhanced stability, and low ASE thresholds of 230.4 (ns) and 50.1 (fs) µJ cm−2 in neat films. ABSTRACT Halide perovskite quantum
Yongfeng Liu, Mengting Zhang, Qingyu Xie, Kehao Hu, Bowen Zhang, Zhe Zhang, Jie Yang, Zhiping Hu, Juan Du, Jia Wang, Min Zhou   +10 more
wiley   +1 more source

A 7-kW narrow-linewidth fiber amplifier assisted by optimizing the refractive index of the large-mode-area active fiber

High Power Laser Science and Engineering
The high-power narrow-linewidth fiber laser has become the most widely used high-power laser source nowadays. Further breakthroughs of the output power depend on comprehensive optimization of stimulated Brillouin scattering (SBS), stimulated Raman ...
Pengfei Ma, Tianfu Yao, Wei Liu, Zhiyong Pan, Yisha Chen, Huan Yang, Zilun Chen, Zefeng Wang, Pu Zhou, Jinbao Chen   +9 more
doaj   +1 more source

Toward High‐Resolution Polymeric Neural Interfaces: A Practical Guide for Electron Beam Lithography

Advanced Science, EarlyView.
Electron beam lithography (EBL) enables sub‐micron patterning of polymer‐based neural implants, overcoming the resolution limits of optical lithography. By addressing challenges such as charging, non‐planarity, and substrate heating, it supports higher channel density, improved miniaturization, and better long‐term tissue integration.
Hanna Karlsson‐Fernberg, Maria Asplund
wiley   +1 more source