Results 21 to 30 of about 3,062,797 (334)

Shortwave infrared polymethine fluorophores matched to excitation lasers enable noninvasive, multicolor in vivo imaging in real time

Nature Chemistry, 2020
High-resolution, multiplexed experiments are a staple in cellular imaging. Analogous experiments in animals are challenging, however, due to substantial scattering and autofluorescence in tissue at visible (350–700 nm) and near-infrared (700–1,000 nm ...
E. Cosco, Anthony L Spearman, Shyam Ramakrishnan, Jakob G. P. Lingg, M. Saccomano, Monica Pengshung, Bernardo A. Arús, Kelly C. Y. Wong, Sarah Glasl, V. Ntziachristos, M. Warmer, Ryan R. McLaughlin, Oliver T. Bruns, Ellen M. Sletten   +13 more
semanticscholar   +1 more source

Laser-Induced Blindage and Mechanisms Studies of Infrared Detection System [PDF]

Hangkong bingqi
Laser interference systems have significantly threatened the functionality of infrared detection systems. Low-energy lasers can degrade or temporarily render inactive the functions of infrared detectors, while high-energy lasers can cause permanent ...
Li Penghui
doaj   +1 more source

High-Power Mid-Infrared (λ∼3-6 μm) Quantum Cascade Lasers

IEEE Photonics Journal, 2022
The performances of mid-infrared (IR) quantum cascade lasers (QCLs) are now reaching a maturity level that enables a variety of applications which require compact laser sources capable of watt-range output powers with high beam quality.
Luke J. Mawst, Dan Botez
doaj   +1 more source

Self-consistent scattering model of carrier dynamics in GaAs-AlGaAs terahertz quantum-cascade lasers [PDF]

, 2003
Intersubband electron scattering transport in terahertz GaAs–AlGaAs quantum cascade lasers is analyzed, using a full 13-level self-consistent rate equation model.
Harrison, P., Ikonic, Z., Indjin, D., Kelsall, R.W.   +3 more
core   +1 more source

Heterogeneously Integrated Distributed Feedback Quantum Cascade Lasers on Silicon

Photonics, 2016
Silicon integration of mid-infrared (MIR) photonic devices promises to enable low-cost, compact sensing and detection capabilities that are compatible with existing silicon photonic and silicon electronic technologies.
Alexander Spott, Jon Peters, Michael L. Davenport, Eric J. Stanton, Chong Zhang, Charles D. Merritt, William W. Bewley, Igor Vurgaftman, Chul Soo Kim, Jerry R. Meyer, Jeremy Kirch, Luke J. Mawst, Dan Botez, John E. Bowers   +13 more
doaj   +1 more source

Proof-of-principle of surface detection with air-guided quantum cascade lasers [PDF]

, 2008
We report a proof-of-principle of surface detection with air-guided quantum cascade lasers. Laser ridges were designed to exhibit an evanescent electromagnetic field on their top surface that can interact with material or liquids deposited on the device.
Colombelli, Raffaele, Krysa, Audrey B., Moreau, Virginie, Painter, Oskar, Perahia, Raviv, Wilson, Luke R.   +5 more
core   +1 more source

Bright Coherent Ultrahigh Harmonics in the keV X-ray Regime from Mid-Infrared Femtosecond Lasers [PDF]

Science, 2012
From Long to Short When you play a string instrument, you raise the frequency, or pitch, of the note by shortening the vibrating portion of the string: Drop the length in half, and you hear a harmonic at double the frequency.
T. Popmintchev, Ming-Chang Chen, D. Popmintchev, P. Arpin, S. Brown, S. Alisauskas, G. Andriukaitis, T. Balciunas, O. Mücke, A. Pugžlys, A. Baltuska, B. Shim, S. Schrauth, A. Gaeta, C. Hernández-García, L. Plaja, A. Becker, A. Jaroń-Becker, M. Murnane, H. Kapteyn   +19 more
semanticscholar   +1 more source

2-$\mu\hbox{m}$ Tm-Doped All-Fiber Pulse Laser With Active Mode-Locking and Relaxation Oscillation Modulating

IEEE Photonics Journal, 2013
We report on the actively mode-locked and relaxation-oscillation-modulated 2- μm all-fiber laser, using an electronic optical phase modulator with fiber pigtail.
Xiong Wang, Pu Zhou, Xiaolin Wang, Rumao Tao, Lei Si   +4 more
doaj   +1 more source

Population-inversion and gain estimates for a semiconductor TASER [PDF]

, 2001
We have investigated a solid-state design advanced (see Soref et al, in SPIE Proceedings, vol. 3795, p, 516, 1999) to achieve a terahertz-amplification-by-the-stimulated-emision-of-radiation (TASER), The original design was based on light-to heavy-hole ...
Harrison, P., Soref, R.A.
core   +1 more source

Interband Mid-IR Semiconductor Lasers

IEEE Photonics Journal, 2010
Significant advances in the room-temperature (RT) continuous-wave (CW) output power of both type-I quantum-well (QW) active-layer lasers and interband cascade lasers have been reported within the 3–4- $\mu\hbox{m}$ wavelength region in 2009 ...
L. J. Mawst
doaj   +1 more source