Varying pre-plasma properties to boost terahertz wave generation in liquids

Ponomareva, Evgenia A.; Ismagilov, Azat; Putilin, S. É.; Tsypkin, A. N.; Kozlov, Sergei A.; Zhang, Xicheng

doi:10.1038/s42005-020-00511-1

Cited by 25 publications

(14 citation statements)

References 23 publications

(28 reference statements)

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“…Figure 2(b) demonstrates spectrum modulus of such THz pulse as well as the normalized modulus of changes in this spectrum due to quadratic and cubic nonlinearity of the medium (11,12) in the THz frequency range. Figure 2(c) demonstrates the spectrum modulus of the THz pulse after its propagation in nonlinear medium (9). The maximum of the spectrum modulus corresponds to the frequency of ν max equals to 1 THz (τ = 10 It can be seen from Fig.…”

Section: Analytical Resultsmentioning

confidence: 92%

“…The very first source of electromagnetic THz radiation was created at the beginning of the last century by the Soviet scientist A.A. Glagoleva-Arkadyeva 5 . In recent years methods have been developed for efficient generation of high-intensity pulsed THz radiation, for example, the method of optical rectification 6 or generation in plasma [7][8][9] . Under the excitation of high-intensity THz radiation, nonlinear effects of media begin to play a significant role [10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

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Radiation shift from triple to quadruple frequency caused by the interaction of terahertz pulses with a nonlinear Kerr medium

Artser

Melnik

Ismagilov

et al. 2022

Preprint

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High-intensity optical radiation propagation in a transparent dielectric medium causes the phenomena of self-action of the pulse and the generation of radiation at triple frequencies due to the cubic nonlinearity of the medium. However, usually the quadratic nonlinear effects outshine the cubic ones in the anisotropic nonlinear crystals. In this work, we demonstrate that for certain experimental parameters the nonlinear effect of the third order can be stronger than one of the second order in MgO:LiNbO3 crystal for terahertz frequency range. We experimentally and theoretically show that it can lead to the significant modification of the classical phenomenon of radiation generation at triple frequencies in the case when the pulse represents only one complete oscillation of the optical field. In the experiment it was shown that the phenomenon of generation of radiation at triple frequencies with respect to the frequency of the maximum spectral density in a nonlinear medium of the pulse disappears, and it is replaced by the generation of radiation at quadruple frequencies. The analysis demonstrates that this effect is based on the asymmetry of the initial spectrum of such extremely short pulses in terms of the number of oscillations.

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Section: Analytical Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Radiation shift from triple to quadruple frequency caused by the interaction of terahertz pulses with a nonlinear Kerr medium

Artser

Melnik

Ismagilov

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Additionally, Anand et al reported a 68-times increase in the intensity of hard X-ray emission from methanol droplets irradiated by double-pulsed femtosecond laser pulses with a delay time of 10 ns [75]. Doublepump excitation is also studied in THz wave generation [16,[76][77][78][79]. Recently, THz generation enhancement by several orders of magnitude in power is observed from gallium droplets under double pump excitation [80].…”

Section: Thz Wave Enhancement Under Double-pump Optical Excitationmentioning

confidence: 99%

Broadband THz Sources from Gases to Liquids

et al. 2021

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Matters are generally classified within four states: solid, liquid, gas, and plasma. Three of the four states of matter (solid, gas, and plasma) have been used for THz wave generation with short laser pulse excitation for decades, including the recent vigorous development of THz photonics in gases (air plasma). However, the demonstration of THz generation from liquids was conspicuously absent. It is well known that water, the most common liquid, is a strong absorber in the far infrared range. Therefore, liquid water has historically been sworn off as a source for THz radiation. Recently, broadband THz wave generation from a flowing liquid target has been experimentally demonstrated through laser-induced microplasma. The liquid target as the THz source presents unique properties. Specifically, liquids have the comparable material density to that of solids, meaning that laser pulses over a certain area will interact with three orders more molecules than an equivalent cross-section of gases. In contrast with solid targets, the fluidity of liquid allows every laser pulse to interact with a fresh area on the target, meaning that material damage or degradation is not an issue with the high-repetition rate intense laser pulses. These make liquids very promising candidates for the investigation of high-energy-density plasma, as well as the possibility of being the next generation of THz sources.

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“…Usually, pulsed THz radiation has low energies 29 , 30 , but there are already widespread methods of generating high-energy radiation, for example, such as in organic crystals 31 , 32 or by filamentation in gases or liquids 33 , 34 . The generation of speckle structures by pulsed THz radiation has not been studied yet.…”

Section: Introductionmentioning

confidence: 99%

Speckle patterns formed by broadband terahertz radiation and their applications for ghost imaging

Leibov

Ismagilov

Zalipaev

et al. 2021

Sci Rep

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Speckle patterns can be very promising for many applications due to their unique properties. This paper presents the possibility of numerically and experimentally formation of speckle patterns using broadband THz radiation. Strong dependence of the statistical parameters of speckles, such as size and sharpness on the parameters of the diffuser are demonstrated: the correlation length and the mean square deviation of the phase surface inhomogeneity. As the surface correlation length is increasing, the speckle size also increases and its sharpness goes down. Alternatively, the magnification of the standard deviation of the surface height leads to the speckle size diminishing and growth of the speckle sharpness. The dimensions of the experimentally formed speckles correspond to the results of numerical simulation. The possibility of utilizing formed speckle patterns for the implementation of the ghost imaging technique has been demonstrated by methods of numerical modeling.

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Varying pre-plasma properties to boost terahertz wave generation in liquids

Cited by 25 publications

References 23 publications

Radiation shift from triple to quadruple frequency caused by the interaction of terahertz pulses with a nonlinear Kerr medium

Radiation shift from triple to quadruple frequency caused by the interaction of terahertz pulses with a nonlinear Kerr medium

Broadband THz Sources from Gases to Liquids

Speckle patterns formed by broadband terahertz radiation and their applications for ghost imaging

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