Results 31 to 40 of about 5,194,279 (273)

Quasi-phase-matching of high harmonic generation using counter-propagating pulses

EPJ Web of Conferences, 2013
We investigate quasi-phase-matching over a range of harmonic orders using trains of up to 8 uniformly-spaced counter-propagating pulses. For trains of up to 4 pulses the measured enhancement of the harmonic signal scales with the number of pulses N as (N+
O’Keeffe K., Hooker S.M.
doaj   +1 more source

Study of Optical Rectification in Polycrystalline Materials Based on Random Quasi-Phase Matching

Crystals, 2022
Random quasi-phase matching (RQPM) in polycrystalline materials has been considered as an important technique for nonlinear optical frequency conversion, especially in wideband laser generation involving femtosecond lasers.
Sijia Wang, Kai Zhong, Hongzhan Qiao, Fangjie Li, Jining Li, Degang Xu, Jianquan Yao   +6 more
doaj   +1 more source

Different phase matching schemes of terahertz wave generation using periodic poled lithium niobate for real-world applications

Physics Open
Terahertz (THz) wave generation through periodic poled lithium niobate (PPLN) has gained significant attention due to its potential applications in spectroscopy, imaging, communication, and security screening.
Ugrasen Singh, Abhinav Kumar, Prashant Povel Dwivedi, Ajay Mishra, Nimish Dixit   +4 more
doaj   +1 more source

Quasi-Phase-Matching in Chiral Materials

, 2019
The second-order nonlinear optical coefficients associated with chirality differ in sign for the two mirror-image forms (enantiomers) of a chiral material.
Colin Nuckolls (1321299), Bertrand Busson (1559185), Martti Kauranen (1690765), André Persoons (2468554), Thomas Katz (17507721)   +4 more
core   +1 more source

Attosecond pulse shaping using partial phase matching

New Journal of Physics, 2014
We propose a method for programmable shaping of the amplitude and phase of the extreme ultraviolet and x-ray attosecond pulses produced by high-order harmonic generation.
Dane R Austin, Jens Biegert
doaj   +1 more source

Rigorous Full-Vectorial Beam Propagation Analysis of Second-Harmonic Generation in Zinc Oxide Waveguides

IEEE Photonics Journal, 2013
In this paper, a rigorous full-vectorial finite-element (FE)-based beam propagation method (BPM) has been implemented to study second-harmonic generation (SHG) in planar zinc oxide (ZnO) waveguides for the first time. It is shown here that the SHG output
I. N. M. Wijeratne, N. Kejalakshmy, B. M. A. Rahman, K. T. V. Grattan   +3 more
doaj   +1 more source

On the generation of optical third-harmonic through quasi-phase-matching in quadratic nonlinear crystals

Wave Motion
Gaetano Assanto
exaly   +2 more sources

Gouy phase compensation in quasi-phase matching [PDF]

, 2008
In any focussed nonlinear interaction the focus induced phase shift, known as the Gouy phase shift, provides an imperfection in phase matching for any linearly invariant material.
Gawith, Corin B.E., Major, Huw E., Smith, Peter G.R.   +2 more
core   +1 more source

Quasi-phase-matching for third harmonic generation in noble gases employing ultrasound [PDF]

, 2012
We study a novel method of quasi-phase-matching for third harmonic generation in a gas cell using the periodic modulation of the gas pressure and thus of the third order nonlinear coefficient in the axial direction created by an ultrasound wave.
Sapaev, Usman, Sapaev, Usman K., Babushkin, Ihar, Herrmann, Joachim   +3 more
core   +1 more source

Tunable violet radiation in a quasi-phase-matched periodically poled stoichiometric lithium tantalate waveguide by direct femtosecond laser writing

Results in Physics, 2020
We report on violet-light generation using the femtosecond-laser written waveguides in periodically poled MgO:LiTaO3 crystal under conditions of third-order quasi-phase matching. Ten parallel depressed cladding waveguides are successfully fabricated with
LingQi Li, Bin Zhang, Carolina Romero, Javier R. Vázquez de Aldana, Lei Wang, Feng Chen   +5 more
doaj   +1 more source