scholarly journals High-harmonic generation in metallic titanium nitride

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
A. Korobenko ◽  
S. Saha ◽  
A. T. K. Godfrey ◽  
M. Gertsvolf ◽  
A. Yu. Naumov ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Harmonic Generation ◽  
Vacuum Ultraviolet ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Damage Threshold ◽  
Laser Damage Threshold ◽  
Nitride Film ◽  
Metallic Titanium ◽  
High Harmonics

AbstractHigh-harmonic generation is a cornerstone of nonlinear optics. It has been demonstrated in dielectrics, semiconductors, semi-metals, plasmas, and gases, but, until now, not in metals. Here we report high harmonics of 800-nm-wavelength light irradiating metallic titanium nitride film. Titanium nitride is a refractory metal known for its high melting temperature and large laser damage threshold. We show that it can withstand few-cycle light pulses with peak intensities as high as 13 TW/cm2, enabling high-harmonics generation up to photon energies of 11 eV. We measure the emitted vacuum ultraviolet radiation as a function of the crystal orientation with respect to the laser polarization and show that it is consistent with the anisotropic conduction band structure of titanium nitride. The generation of high harmonics from metals opens a link between solid and plasma harmonics. In addition, titanium nitride is a promising material for refractory plasmonic devices and could enable compact vacuum ultraviolet frequency combs.

scholarly journals High-harmonic Generation in Metallic Titanium Nitride

2021 ◽  
Author(s):  
A. Korobenko ◽  
S. Saha ◽  
A. T. K. Godfrey ◽  
M. Gertsvolf ◽  
A. Yu. Naumov ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Harmonic Generation ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Metallic Titanium

Enhancing high harmonic generation by the global optimization of a two-color chirped laser field

2019 ◽  
Vol 21 (18) ◽  
pp. 9302-9309 ◽  
Author(s):  
Mohammad Mofared ◽  
Elnaz Irani ◽  
Rasoul Sadighi-Bonabi
Keyword(s):  
Global Optimization ◽  
Harmonic Generation ◽  
Laser Field ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
High Harmonics ◽  
Supercontinuum Spectrum

Enhanced high harmonics are generated by local and global optimization approaches to achieve a supercontinuum spectrum.

scholarly journals Artificial Generation of High Harmonics via Nonrelativistic Thomson Scattering in Metamaterial

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Yongzheng Wen ◽  
Ji Zhou
Keyword(s):  
Harmonic Generation ◽  
Ultrafast Optics ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Thomson Scattering ◽  
Natural Material ◽  
Relativistic Velocity ◽  
Electromagnetic Process ◽  
Anharmonic Oscillation ◽  
High Harmonics

High harmonic generation allows one to extend the frequency of laser to a much broader regime and to study the electron dynamics of matters. However, severely limited by the vague high-order process in natural material and the unfriendly state of the commonly applied gas and plasma media, the ambitious goal of custom-design high harmonics remains exceptionally challenging. Here, we demonstrate that high harmonics can be artificially designed and tailored based on a metamaterial route. With the localized reconstruction of magnetic field in a metamaterial, the nonlinear Thomson scattering, a ubiquitous electromagnetic process which people used to believe that it only occurs with the relativistic velocity, can be stimulated in a nonrelativistic limit, which drives anharmonic oscillation of free electrons and generates high harmonics. An explicit physical model and the numerical simulations perfectly demonstrate the artificial generation and tailoring of the high harmonics. This novel mechanism is entirely dominated by the artificial structure instead of the natural nonlinear compositions. It not only provides unprecedented design freedom to the high harmonic generation but breaks the rigorous prerequisite of the relativistic velocity of the nonlinear Thomson scattering process, which offers fascinating possibilities to the development of new light source and ultrafast optics, and opens up exciting opportunities for the advanced understanding of electrodynamics in condensed matters.

scholarly journals Quasi-phase-matched high harmonic generation in structured plasmas

2019 ◽  
Vol 205 ◽  
pp. 02010
Author(s):  
Michael Wöstmann ◽  
Lukas Splitthoff ◽  
Helmut Zacharias
Keyword(s):  
Harmonic Generation ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Plasma Jets ◽  
Plasma Structure ◽  
Maximum Enhancement ◽  
Harmonic Intensity ◽  
High Harmonics

Structured plasmas are employed in order to realize the quasi-phase-matched generation of high harmonics. The plasma originates from laser ablated solids leading to the appearance of multiple separated jets. By altering the shape of the solid the dimensions of the plasma structure are easily optimized. Combining optimal jet widths and spacing the maximum enhancement of the harmonic intensity by a factor of 16 is observed after four plasma jets.

scholarly journals Artificial Generation of High Harmonics via Nonrelativistic Thomson Scattering in Metamaterial

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Yongzheng Wen ◽  
Ji Zhou
Keyword(s):  
Harmonic Generation ◽  
Ultrafast Optics ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Thomson Scattering ◽  
Natural Material ◽  
Relativistic Velocity ◽  
Electromagnetic Process ◽  
Anharmonic Oscillation ◽  
High Harmonics

High harmonic generation allows one to extend the frequency of laser to a much broader regime and to study the electron dynamics of matters. However, severely limited by the vague high-order process in natural material and the unfriendly state of the commonly applied gas and plasma media, the ambitious goal of custom-design high harmonics remains exceptionally challenging. Here, we demonstrate that high harmonics can be artificially designed and tailored based on a metamaterial route. With the localized reconstruction of magnetic field in a metamaterial, the nonlinear Thomson scattering, a ubiquitous electromagnetic process which people used to believe that it only occurs with the relativistic velocity, can be stimulated in a nonrelativistic limit, which drives anharmonic oscillation of free electrons and generates high harmonics. An explicit physical model and the numerical simulations perfectly demonstrate the artificial generation and tailoring of the high harmonics. This novel mechanism is entirely dominated by the artificial structure instead of the natural nonlinear compositions. It not only provides unprecedented design freedom to the high harmonic generation but breaks the rigorous prerequisite of the relativistic velocity of the nonlinear Thomson scattering process, which offers fascinating possibilities to the development of new light source and ultrafast optics, and opens up exciting opportunities for the advanced understanding of electrodynamics in condensed matters.

scholarly journals Spectrally resolved wavefront characterization of broadband ultrafast high-harmonic pulses

2019 ◽  
Vol 205 ◽  
pp. 01022
Author(s):  
Jansen G.S.M. ◽  
Freisem L. ◽  
Rudolf D. ◽  
Eikema K.S.E. ◽  
Witte S.
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Single Camera ◽  
High Harmonics ◽  
Spectrally Resolved

We demonstrate a sensor that measures wavefronts of multiple extreme ultraviolet wavelengths simultaneously. By incorporating transmission gratings into the apertures of a Hartmann mask, we can record wavefront information for series of discrete harmonics from a high-harmonic generation source in a single camera exposure, without the need for scanning parts. Wavefronts of up to nine high harmonics at 25-49 nm wavelength are retrieved, and ultrafast spatiotemporal couplings can be detected.

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