Single-cycle attosecond pulses by Thomson backscattering of terahertz pulses

Tóth, György; Tibai, Zoltán; Sharma, Ashutosh; Fülöp, J. A.; Hebling, J.

doi:10.1364/josab.35.00a103

Cited by 14 publications

(5 citation statements)

References 54 publications

(49 reference statements)

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“…Presently, for reaching higher field amplitudes, local field enhancement techniques are used 8,9 . On the other hand, creation and development of powerful THz sources will open the way to many exciting applications spanning from switching and controlling of magnetic domains [10][11][12] to THz-enhanced attosecond pulse generation 13,14 and table-top electron acceleration 15,16 .…”

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confidence: 99%

Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

et al. 2020

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Extreme nonlinear interactions of THz electromagnetic fields with matter are the next frontier in nonlinear optics. However, reaching this frontier in free space is limited by the existing lack of appropriate powerful THz sources. Here, we experimentally demonstrate that two-color filamentation of femtosecond mid-infrared laser pulses at 3.9 μm allows one to generate ultrashort sub-cycle THz pulses with sub-milijoule energy and THz conversion efficiency of 2.36%, resulting in THz field amplitudes above 100 MV cm −1. Our numerical simulations predict that the observed THz yield can be significantly upscaled by further optimizing the experimental setup. Finally, in order to demonstrate the strength of our THz source, we show that the generated THz pulses are powerful enough to induce nonlinear cross-phase modulation in electro-optic crystals. Our work paves the way toward free space extreme nonlinear THz optics using affordable table-top laser systems.

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confidence: 99%

Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

et al. 2020

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“…The same pulses are applicable usually for the manipulation of matters, including lattice and molecular excitations and field-free orientation of molecules 5 , 6 , as well as controlling electron beams, charge-, and spin- waves 7 , and material structures 8 . THz pulses with even higher energy (on the level of mJ) and electric field (on the level of MV/cm) are needed for enhancement of high harmonic generation 9 , acceleration of charged particles 10 – 13 , and generation of carrier-envelope-phase stable attosecond pulses 14 .…”

Section: Introductionmentioning

confidence: 99%

Tilted pulse front pumping techniques for efficient terahertz pulse generation

Tóth,

Polónyi,

Hebling

2023

Light Sci Appl

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Optical rectification of femtosecond laser pulses has emerged as the dominant technique for generating single- and few-cycle terahertz (THz) pulses. The advent of the tilted pulse front pumping (TPFP) velocity matching technique, proposed and implemented two decades ago, has ushered in significant advancements of these THz sources, which are pivotal in the realm of THz pump-probe and material control experiments, which need THz pulses with microjoule energies and several hundred kV/cm electric field strengths. Furthermore, these THz sources are poised to play a crucial role in the realization of THz-driven particle accelerators, necessitating millijoule-level pulses with tens of MV/cm electric field strengths. TPFP has enabled the efficient velocity matching in lithium niobate crystals renowned for their extraordinary high nonlinear coefficient. Moreover, its adaptation to semiconductor THz sources has resulted in a two-hundred-times enhancement in conversion efficiency. In this comprehensive review, we present the seminal achievements of the past two decades. We expound on the conventional TPFP setup, delineate its scaling limits, and elucidate the novel generation TPFP configurations proposed to surmount these constraints, accompanied by their preliminary outcomes. Additionally, we provide an in-depth analysis of the THz absorption, refractive index, and nonlinear coefficient spectra of lithium niobate and widely used semiconductors employed as THz generators, which dictate their suitability as THz sources. We underscore the far-reaching advantages of tilted pulse front pumping, not only for LN and semiconductor-based THz sources but also for selected organic crystal-based sources and Yb-laser-pumped GaP sources, previously regarded as velocity-matched in the literature.

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“…Many possible applications of THz pulses have been proposed [5][6][7][8][9][10][11] and demonstrated [12][13][14][15][16][17][18][19] , which need the application of THz pulses with significantly above 1 MV/cm peak electric field strength or would strongly benefit from it. These applications include enhancement of both the high-harmonic generation efficiency [5] and the cut-off frequency [6] , orientation of molecules [12,13] , electron [9,10,15,19] and proton [8] acceleration or other manipulation [7,17,18] , and generation of very special carrier-envelope stable attosecond pulses [11] . In addition to the above indicated megavolts (MV)/cm range of electric field, some of the previously mentioned applications also require well controllable single-or few-cycle THz pulses.…”

Section: Introductionmentioning

confidence: 99%

Performance comparison of lithium-niobate-based extremely high-field single-cycle terahertz sources [Invited]

et al. 2021

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Tilted-pulse-front-pumping (TPFP) lithium-niobate terahertz (THz) pulse sources are widely used in pump-probe and control experiments since they can generate broadband THz pulses with tens of microjoules of energy. However, the conventional TPFP setup suffers from limitations, hindering the generation of THz pulses with peak electric field strength over 1 MV/cm. Recently, a few setups were suggested to mitigate or even eliminate these limitations. In this paper, we shortly review the setups that are suitable for the generation of single-cycle THz pulses with up to a few tens of megavolts/centimeter focused electric field strength. The THz pulses available with the new layouts pave the way for previously unattainable applications that require extremely high electric field strength and pulse energy in the multi-millijoule range.

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Single-cycle attosecond pulses by Thomson backscattering of terahertz pulses

Cited by 14 publications

References 54 publications

Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

Tilted pulse front pumping techniques for efficient terahertz pulse generation

Performance comparison of lithium-niobate-based extremely high-field single-cycle terahertz sources [Invited]

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