Highly efficient broadband terahertz generation from ultrashort laser filamentation in liquids

Dey, Indranuj; Jana, Kamalesh; Fedorov, Vladimir Yu.; Koulouklidis, Anastasios D.; Mondal, Angana; Shaikh, Moniruzzaman; Sarkar, Deep; Lad, Amit D.; Tzortzakis, S.; Couairon, Arnaud; Kumar, G. Ravindra

doi:10.1038/s41467-017-01382-x

Cited by 155 publications

(95 citation statements)

References 36 publications

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“…[148] The THz radiation generated by a two-color plasma filament has a conical emission pattern, a feature characteristic especially for long filaments. [156] THz pulse energies up to 80 µJ were obtained when pumping with about 30 mJ at 0.8 µm, while the THz pulse bandwidths reached 100 THz. [152] In the forward (on-axis) direction the effective length for THz generation is limited to L eff = (λ p /2)/(n ω − n 2ω ) ≈ 22 mm in ambient air, over which the polarity of the THz pulse remains unchanged.…”

Section: Thz Sources Based On Laser-filament-induced Plasmasmentioning

confidence: 99%

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Laser‐Driven Strong‐Field Terahertz Sources

Fülöp

Tzortzakis

Kampfrath

2019

Advanced Optical Materials

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271

147

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reason for this interest relies on the fact that THz radiation can couple resonantly to numerous fundamental motions of ions, electrons, and electron spins in all phases of matter. For example, in solids, the THz range overlaps with the frequency of lattice vibrations (phonons), the collision rates of conduction electrons, the binding energy of bound electron-hole pairs (excitons), and the precession frequency of spin waves (magnons). Consequently, THz radiation, both continuous-wave and pulsed, has been used for characterization of and gaining insight into elementary processes in complex materials. The majority of these studies used relatively weak THz fields and, thus, probed the linear response of the material, without inducing notable material modifications.Only recently, however, completely new avenues in THz science were opened up by triggering nonlinear THz responses of materials. [3][4][5][6][7][8][9][10][11][12][13] Instead of using weak fields to primarily observe selected THz modes such as phonons or magnons, strong fields allow one to actively drive them to unprecedentedly large amplitudes, potentially thereby resulting in novel states of matter. [6,8,11] For example, simulations suggest that exciting matter with intense THz transients may lead to massive modifications of electrically [14] or magnetically [15] ordered domains and enable the acceleration of free ions to ≈1 MeV, [16] and postacceleration to 50-100 MeV energies. [17] Remarkable experimental results such as switching of magnetic order, [18,19] parametric amplification of optical phonons, [20] novel insights into spin-lattice coupling, [21,22] and acceleration of free electrons in a THz linear accelerator [23] were achieved only recently. This progress has been made possible by the development of laser-driven table-top THz sources routinely providing pulses with unprecedented energies and peak electric and magnetic field strengths throughout the entire THz spectral range. Different laser-based THz pulse generation techniques can be used to access different parts of the spectral range extending from 0.1 to 10 THz. Some of the recently developed technologies enable the generation of radiation with even larger bandwidth or tuning range up to 100 THz and beyond, which lead to an extension of what is called the THz spectral range. An overview of the approximate spectral coverage and the achieved highest pulse energies and peak electric-field strengths of various laserdriven technologies is given in Figure 1. ScopeIn this work, the basic principles of femtosecond-laser-driven intense pulsed THz sources and their recent development are reviewed. These sources are capable of delivering peak electric field strengths on the MV cm −1 scale. Corresponding typical THz pulse energies are on the µJ-to-mJ level, depending on A review on the recent development of intense laser-driven terahertz (THz) sources is provided here. The technologies discussed include various types of sources based on optical rectification (OR), spintronic emitters, and laserfilame...

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Section: Thz Sources Based On Laser-filament-induced Plasmasmentioning

confidence: 99%

“…The reason is off-axis phase matching. [156] Finally, a more exotic laser-plasma technique for THz generation in a laser-driven ion accelerator using solid targets has been reported. This length corresponds to a fundamental-to-SH relative phase shift of ϑ(L eff ) − ϑ 0 = π.…”

Section: Thz Sources Based On Laser-filament-induced Plasmasmentioning

confidence: 99%

Laser‐Driven Strong‐Field Terahertz Sources

Fülöp

Tzortzakis

Kampfrath

2019

Advanced Optical Materials

Self Cite

271

147

View full text Add to dashboard Cite

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“…It is known that the pump-medium interaction length is critical for liquids and determined by filament length [22]. Using a 5 cm parabolic mirror, the length of the filament is about 1 mm, which is larger than the flat jets thickness in our experiments.…”

Section: Discussionmentioning

confidence: 66%

Flat liquid jet as a highly efficient source of terahertz radiation

Tcypkin¹,

Ponomareva²,

Putilin³

et al. 2019

Opt. Express

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Polar liquids are strong absorbers of electromagnetic waves in the terahertz range, therefore, historically such liquids have not been considered as good candidates for terahertz sources. However, flowing liquid medium has explicit advantages, such as a higher damage threshold compared to solid-state sources and more efficient ionization process compared to gases. Here we report systematic study of efficient generation of terahertz radiation in flat liquid jets under sub-picosecond single-color optical excitation. We demonstrate how medium parameters such as molecular density, ionization energy and linear absorption contribute to the terahertz emission from the flat liquid jets. Our simulation and experimental measurements reveal that the terahertz energy has quasi-quadratic dependence on the optical excitation pulse energy. Moreover, the optimal pump pulse duration, which depends on the thickness of the jet is theoretically predicted and experimentally confirmed. The obtained optical-to-terahertz energy conversion efficiency is more than 0.05%. It is comparable to the commonly used optical rectification in most of electro-optical crystals and two-color air filamentation. These results, significantly advancing prior research, can be successfully applied to create a new alternative source of terahertz radiation.

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“…Furthermore, as a polar solvent, addition of various solutes such as electrolytes (ions), metal nano-particles such as gold, and hydrogen peroxide can easily change and control light interaction with water. Recently, water was also used as a source for THz wave emission under intense laser irradiation conditions [16,17] though it has been considered to be non-applicable partly because of the high absorption coefficient of water 220 cm −1 [18,19] in the THz wave region.…”

Section: Introductionmentioning

confidence: 99%

Correlated emission of X-ray and sound from water film irradiated by femtosecond laser pulses

Huang

Juodkazis

Hatanaka

2019

Applied Surface Science

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Simultaneous measurements of hard X-ray by a Geiger counter and audible sound (10 Hz-20 kHz) by a microphone from a thin water film in air were carried out under intense single and double pulse irradiations of femtosecond laser (35 fs, 800 nm, 1 kHz). Emission profiles of X-ray and sound under the single pulse irradiation by changing the water film position along the laser incident direction (Z-axis) show the same peak positions with a broader emission in sound (403 µm at FWHM) than in X-ray (37 µm). Under the double pulse irradiation condition with the time delay at 0 ps and 4.6 ns, it was clearly observed that the acoustic signal intensity is enhanced in associated with X-ray intensity enhancements. The enhancements can be assigned to laser ablation dynamics such as pre-plasma formation and transient surface roughness formation induced by the pre-pulse irradiation. For the acoustic signal under the double-pulse irradiation with the time delay, there was a weak dependence observed on the pre-pulse irradiation position at the laser focus. It is consistent with a long breakdown filament formation which makes the microphone-detection less position-sensitive.

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Highly efficient broadband terahertz generation from ultrashort laser filamentation in liquids

Cited by 155 publications

References 36 publications

Laser‐Driven Strong‐Field Terahertz Sources

Laser‐Driven Strong‐Field Terahertz Sources

Flat liquid jet as a highly efficient source of terahertz radiation

Correlated emission of X-ray and sound from water film irradiated by femtosecond laser pulses

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