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Title: High-order harmonic generations in intense MIR fields by cascade three-wave mixing in a fractal-poled LiNbO_3 photonic crystal

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1395393
Grant/Contract Number:
FG02-04ER15614; SC0012462
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Optics Letters
Additional Journal Information:
Journal Volume: 42; Journal Issue: 19; Related Information: CHORUS Timestamp: 2017-09-28 10:47:05; Journal ID: ISSN 0146-9592
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English

Citation Formats

Park, Hyunwook, Camper, Antoine, Kafka, Kyle, Ma, Boqin, Lai, Yu Hang, Blaga, Cosmin, Agostini, Pierre, DiMauro, Louis F., and Chowdhury, Enam. High-order harmonic generations in intense MIR fields by cascade three-wave mixing in a fractal-poled LiNbO_3 photonic crystal. United States: N. p., 2017. Web. doi:10.1364/OL.42.004020.
Park, Hyunwook, Camper, Antoine, Kafka, Kyle, Ma, Boqin, Lai, Yu Hang, Blaga, Cosmin, Agostini, Pierre, DiMauro, Louis F., & Chowdhury, Enam. High-order harmonic generations in intense MIR fields by cascade three-wave mixing in a fractal-poled LiNbO_3 photonic crystal. United States. doi:10.1364/OL.42.004020.
Park, Hyunwook, Camper, Antoine, Kafka, Kyle, Ma, Boqin, Lai, Yu Hang, Blaga, Cosmin, Agostini, Pierre, DiMauro, Louis F., and Chowdhury, Enam. 2017. "High-order harmonic generations in intense MIR fields by cascade three-wave mixing in a fractal-poled LiNbO_3 photonic crystal". United States. doi:10.1364/OL.42.004020.
@article{osti_1395393,
title = {High-order harmonic generations in intense MIR fields by cascade three-wave mixing in a fractal-poled LiNbO_3 photonic crystal},
author = {Park, Hyunwook and Camper, Antoine and Kafka, Kyle and Ma, Boqin and Lai, Yu Hang and Blaga, Cosmin and Agostini, Pierre and DiMauro, Louis F. and Chowdhury, Enam},
abstractNote = {},
doi = {10.1364/OL.42.004020},
journal = {Optics Letters},
number = 19,
volume = 42,
place = {United States},
year = 2017,
month = 9
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on September 29, 2018
Publisher's Accepted Manuscript

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  • We propose a scheme for efficient Cherenkov high-order harmonic generation. Second to fifth order harmonic wave are observed in a single periodically poled ferroelectric crystal in our experiment. The noncollinear high-order harmonic generation is produced via enhanced Cherenkov second harmonic cascaded with successive multistep sum-frequency generation with simultaneously longitudinal phase-matching. The emission angle and power dependencies are analyzed in detail experimentally, which coincide with theoretical predictions.
  • We present a time-independent generalized Floquet approach for nonperturbative treatment of high-order harmonic generation (HG) in intense onea (i) determination of the complex quasienergy eigenvalue and eigenfunction by means of the non-Hermitian Floquet formalism, wherein the Floquet Hamiltonian is discretized by the complex-scaling generalized pseudospectral technique [Wang, Chu, and Laughlin, Phys. Rev. A {bold 50}, 3208 (1994)], and (ii) calculation of the HG rates based on the approach that implies the classical treatment of the electromagnetic field and quantal treatment of the atom. The method is applied to the nonperturbative study of HG by the hydrogen atom in strong lasermore » fields with the fundamental frequencies 532 and 775 nm and their third harmonics. The results show a strong dependence on the relative phase {delta} between the fundamental frequency field and its harmonic. For the intensities used in calculations (1{times}10{sup 13} and 5{times}10{sup 13} W/cm{sup 2} for the fundamental frequency 532 nm and 1{times}10{sup 13} and 3{times}10{sup 13} W/cm{sup 2} for the fundamental frequency 775 nm, the harmonic intensity being 10 and 100 times weaker), the total photon emission rate has its maximum at {delta}=0 and minimum at {delta}={pi}. However, this tendency, while valid for the first several HG peaks, is reversed for the higher HG peaks. The HG spectrum for {delta}={pi} is broader and the peak heights decrease more slowly compared to the case of {delta}=0. These results have their analog in the multiphoton above-threshold detachment study performed recently for H{sup {minus}} ions [Telnov, Wang, and Chu, Phys. Rev. A {bold 51}, 4797 (1995)].« less
  • The authors present a general nonperturbative approach for the study of multiple high-order harmonic generation (HHG) in intense one- and two-color laser fields. The procedure consists of the following elements: (1) Determination of the complex quasienergy states by means of the generalized Floquet formalism, wherein the Floquet Hamiltonian is discretized by the complex-scaling generalized pseudospectral technique. (2) Calculation of the HHG spectra within the dipole and acceleration frameworks. The method is applied to the study of the two-color phase control of HHG processes of atomic hydrogen with the fundamental frequencies 532 and 775 nm and their third harmonics. Detailed resultsmore » will be presented.« less
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  • We present a time-dependent non-Hermitian Floquet approach for the precision three-dimensional nonperturbative calculations of high-order harmonic generation (HHG) rates of the hydrogen molecular ions subject to intense laser fields. The procedure involves an extension of the complex-scaling generalized pseudospectral method for nonuniform spatial discretization of the Hamiltonian and non-Hermitian time propagation of the time-evolution operator. The approach is designed for effective and high-precision nonperturbative treatment of high-order multiphoton processes in very intense and/or low-frequency laser fields, which are generally more difficult to treat using the conventional time-independent non-Hermitian Floquet matrix techniques. The method is applied to the multiphoton ionization (MPI)more » and HHG calculations of H{sub 2}{sup +} for the wavelength 532 nm at the equilibrium internuclear separation (R=2.0 a.u.) and several laser intensities, as well as at the laser intensity 5x10{sup 13} W/cm{sup 2} and various internuclear distances in the range between 3.0 and 17.5 a.u. We found that both the MPI and HHG rates are strongly dependent on R. Further, at some internuclear separations R, the HHG productions are strongly enhanced and this phenomenon can be attributed to the resonantly enhanced MPI at these R. Finally, the enhancement of higher harmonics is found to take place mainly at larger R. Detailed study of the correlation between the behavior of MPI and HHG phenomena is presented.« less