Effects of higher-order nonlinear processes on harmonic-generation phase matching

Effects of higher-order nonlinear processes on harmonic-generation phase matching We experimentally and theoretically reinvestigate the significant third-harmonic enhancement via plasma generation using time-resolved methods with two-color, copropagating femtosecond laser pulses. By measuring plasma densities with digital in-line holography and using carrier-resolved unidirectional pulse propagation equations to model the experiment, we show that a fifth-order nonlinearity contributes to third-harmonic generation mainly via phase matching. In particular, our study confirms that self- and cross-phase modulation including higher-order nonlinear processes can play a crucial role in harmonic-generation phase matching, which has recently been proposed by Weerawarne etal. [Phys. Rev. Lett. 114, 093901 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.093901] and should be potentially applicable to high-order harmonic generation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Effects of higher-order nonlinear processes on harmonic-generation phase matching

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Effects of higher-order nonlinear processes on harmonic-generation phase matching

Abstract

We experimentally and theoretically reinvestigate the significant third-harmonic enhancement via plasma generation using time-resolved methods with two-color, copropagating femtosecond laser pulses. By measuring plasma densities with digital in-line holography and using carrier-resolved unidirectional pulse propagation equations to model the experiment, we show that a fifth-order nonlinearity contributes to third-harmonic generation mainly via phase matching. In particular, our study confirms that self- and cross-phase modulation including higher-order nonlinear processes can play a crucial role in harmonic-generation phase matching, which has recently been proposed by Weerawarne etal. [Phys. Rev. Lett. 114, 093901 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.093901] and should be potentially applicable to high-order harmonic generation.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1050-2947
eISSN
1094-1622
D.O.I.
10.1103/PhysRevA.96.013816
Publisher site
See Article on Publisher Site

Abstract

We experimentally and theoretically reinvestigate the significant third-harmonic enhancement via plasma generation using time-resolved methods with two-color, copropagating femtosecond laser pulses. By measuring plasma densities with digital in-line holography and using carrier-resolved unidirectional pulse propagation equations to model the experiment, we show that a fifth-order nonlinearity contributes to third-harmonic generation mainly via phase matching. In particular, our study confirms that self- and cross-phase modulation including higher-order nonlinear processes can play a crucial role in harmonic-generation phase matching, which has recently been proposed by Weerawarne etal. [Phys. Rev. Lett. 114, 093901 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.093901] and should be potentially applicable to high-order harmonic generation.

Journal

Physical Review AAmerican Physical Society (APS)

Published: Jul 10, 2017

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