Zobrazeno 1 - 10
of 129
pro vyhledávání: '"Ravi Koustuban"'
Publikováno v:
EPJ Web of Conferences, Vol 205, p 01016 (2019)
We propose a design for high efficiency narrow-band terahertz generation using multiple stages with dispersion compensation. Terahertz efficiencies of a few percent are predicted.
Externí odkaz:
https://doaj.org/article/f99d507bac464a4ca0e1d98ef6d39f6a
Autor:
Ravi, Koustuban, Kärtner, Franz X.
We introduce a new regime of cascaded quadratic nonlinearities which result in a continuous red shift of the optical pump, analogous to a Raman shifting process rather than self-phase modulation. This is particularly relevant to terahertz generation,
Externí odkaz:
http://arxiv.org/abs/2001.02439
Autor:
Ravi, Koustuban, Kärtner, Franz X.
We explore the dynamics of a system where input spectra in the optical domain with very disparate center frequencies are strongly coupled via highly phase-matched, cascaded second-order nonlinear processes driven by terahertz radiation. The only requ
Externí odkaz:
http://arxiv.org/abs/1903.04177
We analytically show how a superposition of beamlets produces terahertz radiation with greater spatial homogeneity and efficiency compared to tilted-pulse-fronts generated by diffraction gratings. The advantages are particularly notable for large pum
Externí odkaz:
http://arxiv.org/abs/1810.09118
Autor:
Ravi, Koustuban, Kärtner, Franz X.
A 2-D spatio-temporal analysis of terahertz generation by optical rectification of tilted-pulse-fronts is presented. Closed form expressions of terahertz transients and spectra in two spatial dimensions are furnished in the undepleted limit. Importan
Externí odkaz:
http://arxiv.org/abs/1809.10928
We describe a robust system for laser-driven narrowband terahertz generation with high conversion efficiency in periodically poled Lithium Niobate (PPLN). In the multi-stage terahertz generation system, the pump pulse is recycled after each PPLN stag
Externí odkaz:
http://arxiv.org/abs/1809.01892
Autor:
Ravi, Koustuban, Kärtner, Franz X
We introduce a general technique to generate compressed broadband terahertz pulses based on difference frequency generation of optical pump radiation using aperiodically poled structures. The pump pulse format and poling of the crystals conceived are
Externí odkaz:
http://arxiv.org/abs/1710.07843
Pulse Sequences for Efficient Multi-Cycle Terahertz Generation in Periodically Poled Lithium Niobate
The use of laser pulse sequences to drive the cascaded difference frequency generation of high energy, high peak-power and multi-cycle terahertz pulses in cryogenically cooled periodically poled lithium niobate is proposed. Detailed simulations consi
Externí odkaz:
http://arxiv.org/abs/1606.05278
Autor:
Huang, W. Ronny, Fallahi, Arya, Wu, Xiaojun, Cankaya, Huseyin, Calendron, Anne-Laure, Ravi, Koustuban, Zhang, Dongfang, Nanni, Emilio A., Hong, Kyung-Han, Kärtner, Franz X.
Publikováno v:
Optica 3, 1209-1212 (2016)
Ultrashort electron beams with narrow energy spread, high charge, and low jitter are essential for resolving phase transitions in metals, semiconductors, and molecular crystals. These semirelativistic beams, produced by phototriggered electron guns,
Externí odkaz:
http://arxiv.org/abs/1605.06667
Autor:
Ravi, Koustuban, Hemmer, Michael, Cirmi, Giovanni, Reichert, Fabian, Schimpf, Damian N., Muecke, Oliver D., Kaertner, Franz X.
A highly efficient, practical approach to high-energy terahertz (THz) generation based on spectrally cascaded optical parametric amplification (THz-COPA) is introduced. The THz wave initially generated by difference frequency generation between a str
Externí odkaz:
http://arxiv.org/abs/1604.08919