Results 51 to 60 of about 48,016 (315)

High-frequency vector harmonic mode locking driven by acoustic resonances [PDF]

Optics Letters, 2019
A controllable passive harmonic mode locking (HML) in an erbium-doped fiber laser with a soliton pulse shaping using a single-wall carbon nanotube has been experimentally demonstrated. By increasing the pump power and adjusting the in-cavity polarization controller, we reached the 51st-order harmonic (902 MHz) having the output power of 37 mW.
KBASHI, H, Sergeyev, Sergey, AL-ARAIMI, M, ROZHIN, A., Korobko, D.A., Fotiadi, Andrei   +5 more
openaire   +3 more sources

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source

Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May, Finn‐Lennard Janthur, Lena Kreie, Michael Müller, Sarah Seffer, Nick Schwarz, Jörg Hermsdorf, Thomas Hassel, Stefan Kaierle, Ludger Overmeyer   +9 more
wiley   +1 more source

Coexistence of Bloch and Parametric Mechanisms of High-Frequency Gain in Doped Superlattices

Nanomaterials, 2023
The detailed theoretical study of high-frequency signal gain, when a probe microwave signal is comparable to the AC pump electric field in a semiconductor superlattice, is presented.
Vladislovas Čižas, Natalia Alexeeva, Kirill N. Alekseev, Gintaras Valušis   +3 more
doaj   +1 more source

An interferometer experiment to explore the aspect angle dependence of stimulated electromagnetic emission spectra [PDF]

, 2005
International audienceWhen the Earth's ionosphere is irradiated by a radiofrequency (RF) electromagnetic wave of sufficiently high power density and tuned to match a natural E- or F-region plasma frequency, ionospheric magnetoionic wave modes may be ...
Khudukon, B. Z., Rietveld, Michael T., Yurik, R.Yu, Brekke, A., Belyey, Tereshchenko, Tereshchenko, E., Khudukon, B., Rietveld, M., Hoz, C. La, Belyey, Vasyl, Tereshchenko, E.D., Hagfors, Yurik, R. Yu., Khudukon, Yu. Yurik, Heinselman, C., Grill, Brekke, Belyey, V., Isham, B., Rietveld, Hagfors, T., Heinselman, Brekke, Asgeir, Rietveld, M. T., La Hoz, C., Isham, null La Hoz, Grill, M., Yurik, Yu., null null, Yurik, R. Yu., Yurik, R., La Hoz, Cesar, Tereshchenko, E. D., La Hoz   +36 more
core   +1 more source

Molecular Dynamics Studies of Shape Memory Polymers: From Bead–Spring Models to Atomistic Simulations

Advanced Engineering Materials, EarlyView.
Coarse‐grained (left) and atomistic (right) models of the shape memory polymer ESTANE ETE 75DT3 are shown schematically. The two representations bridge molecular detail and mesoscopic description. Both models capture shape memory behavior, linking segmental mobility and conformational relaxation of anisotropic chains to macroscopic recovery, and ...
Fathollah Varnik
wiley   +1 more source

Coordinated optical and radar observations of ionospheric pumping for a frequency pass through the second electron gyroharmonic at HAARP [PDF]

, 2007
On 4 February 2005, the High-frequency Active Auroral Research Program (HAARP) facility was operated in O and X mode while pointing into the magnetic zenith to produce artificial optical emissions in the ionospheric F layer. The pump frequency was set to
Senior, Andrew, Pedersen, T., Kosch, Mike J., Bristow, B., Mishin, E., Watkins, B., Hughes, J., Oyama, S.   +7 more
core  

Controls for the generation of high-order harmonics and attosecond pulses by an infrared laser field combined with a low-frequency pulse

, 2012
We investigate high-order harmonic generations by controlling various quantum paths of harmonics in an infrared laser field which combines a low-frequency pulse.
贺海翔, He Hai-Xiang, Guo Ya-Hui, He Guo-Zhong   +3 more
core   +1 more source

Exciton Binding Energy of Phosphorescent Emitter Molecules in Organic Light‐Emitting Diodes

Advanced Functional Materials, EarlyView.
Energy level alignment is key to efficient OLED design, yet determining LUMO energies remains challenging. A methodology based on field‐induced dissociation and kinetic Monte Carlo simulations is presented to extract LUMO energies of iridium‐based phosphorescent emitters from their exciton binding energy.
Hiroki Tomita, Lucas R. L. Norg, Patrick Diederen, Clint van Hoesel, Christ H. L. Weijtens, Peter A. Bobbert, Reinder Coehoorn   +6 more
wiley   +1 more source

Vibrational state effect on frequency modulation of harmonic emission from H2+

四川大学学报. 自然科学版, 2019
High-order harmonic generation from H2+ with different vibrational states has been theoretically investigated. The results show that the red-shifts of the harmonics can be found in the lower vibrational states. As the vibrational state increases, the red-
LIU Hang, LI Yi, JING Xiao-Dan, FENG Li-Qiang   +3 more
doaj