Results 261 to 270 of about 11,957 (302)
Some of the next articles are maybe not open access.
Terahertz Generation and Acceleration
CLEO Pacific Rim Conference, 2018Laser based multi-cycle THz generation by difference frequency mixing has been pushed to optical to THz conversion efficiencies close to 1%. This opens up the possibility to implement THz driven electron and X-ray sources.
openaire +2 more sources
Terahertz generator - spherotron
Infocommunications and Radio Technologies, 2018A simulation of terahertz generator - spherotron was performed. It was shown such a generator has a very simple design and efficiency of 30 %, when beam current in a pulse of 1-10 kA and a voltage about 45 kV.
Vladimir V Matveyenka +1 more
openaire +1 more source
Designs of terahertz waveguides for efficient parametric terahertz generation
Applied Physics Letters, 2003We show that for a slab waveguide, while pump and idler waves are weakly affected by the waveguide, their parametrically generated terahertz (THz) wave propagates in the form of multimodes. These waves may destructively interfere with one another in terms of their phases, resulting in inefficient THz parametric conversion.
Wei Shi, Yujie J. Ding
openaire +1 more source
Generation of broadband terahertz vortex beams
Optics Letters, 2014We propose and demonstrate a method for generating broadband terahertz (THz) vortex beams. We convert a THz radially polarized beam into a THz vortex beam via achromatic polarization optical elements for THz waves and characterize the topological charge of the generated vortex beam by measuring the spatial distribution of the phase of the THz wave at ...
Ryo, Imai +4 more
openaire +2 more sources
Terahertz wave generation by nanoconfinement of light
Applied Optics, 2014This paper presents a novel nanosource of continuous terahertz (THz) wave radiation based on difference frequency generation (DFG). Both the optical and THz waves are confined in a nanoscale plasmonic waveguide. The results of theoretical investigations indicate that the appropriate geometry of the plasmonic waveguide has a relatively long optical and ...
Hamid Reza, Zangeneh +1 more
openaire +2 more sources
Dynamically phase-matched terahertz generation
Optics Letters, 2012We present the generation of intense terahertz pulses by optical rectification of 780 nm pulses in a large area gallium phosphide crystal. The velocity mismatch between optical and terahertz pulses thereby limits the bandwidth of the terahertz pulses. We show that this limitation can be overcome by a dynamic modification of the refractive index of the ...
Daniel, Dietze +2 more
openaire +2 more sources
Broadband generation of terahertz radiation in a waveguide
Optics Letters, 2004We report a novel geometry that allows for the phase-matched generation of broadband terahertz radiation in a polymer-based parallel-plate metal waveguide by means of optical rectification. Both the optical pump beam and the generated terahertz radiation propagate in the fundamental mode of the waveguide. This allows for noncritical phase matching over
Hua, Cao, Richard A, Linke, Ajay, Nahata
openaire +2 more sources
Autoresonance in a Model of a Terahertz Wave Generator
Proceedings of the Steklov Institute of Mathematics, 2018zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kiselev, O. M., Novokshenov, V. Yu.
openaire +1 more source
Terahertz generation with tandem seeded optical parametric generators
Optics Letters, 2005A simple difference frequency generation (DFG) scheme based on two seeded optical parametric generators is presented as a tunable terahertz (THz) source. Using the nonlinear optical crystal 4-dimethylamino-N-methyl-4-stilbazolium-tosylate (DAST) as the DFG crystal, our system has demonstrated continuous and seamless tunable operation from 1.6 to 4.5 ...
P E, Powers +4 more
openaire +2 more sources
Multicycle terahertz generation in virtual PPLN
Optics LettersMulticycle terahertz pulses are in urgent demand for spectroscopy, manipulation of condensed matter, and particle acceleration. We experimentally demonstrate generating terahertz pulses with tens-of-cycles duration by optical rectification of femtosecond laser pulses in a bulk LiNbO3 crystal in the regime of nonlinear mixing of ordinary and ...
S. B. Bodrov +2 more
openaire +2 more sources