Efficient semiconductor multicycle terahertz pulse source

Nugraha, Priyo S.; Krizsán, Gergő; Polonyi, Gy.; Mechler, Mátyás; Hebling, J.; Tóth, Gy.; Fülöp, J. A.

doi:10.1088/1361-6455/aab9ec

Cited by 22 publications

(16 citation statements)

References 36 publications

(52 reference statements)

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“…[35,78] • Many semiconductors (e.g., CdTe, GaAs, GaP, ZnTe) are optically isotropic. • The linear absorption coefficient of many semiconductors in the THz range is smaller than that of LN or organic crystals, which can partially compensate for their smaller nonlinearity.…”

Section: Basic Propertiesmentioning

confidence: 99%

“…(Figure 14). [78] GaP can offer a relatively broad tuning range up to about 7 THz (Figure 15). The first demonstration of this technique with a ZnTe CG pumped above the cut-off for 3PA [45] resulted in 3% THz generation efficiency, two orders of magnitude higher than the previously reported highest value for ZnTe.…”

Section: Novel Concepts For Infrared Pumpingmentioning

confidence: 99%

“…2020, 8, 1900681 Figure 14. [78] Copyright 2018, IOP Publishing. b) Scanning electron microscope image of a cleaved CG test sample showing the binary line profile required for high diffraction efficiency.…”

Section: Generation Of Higher Thz Frequenciesmentioning

confidence: 99%

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Laser‐Driven Strong‐Field Terahertz Sources

Fülöp

Tzortzakis

Kampfrath

2019

Advanced Optical Materials

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270

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: Basic Propertiesmentioning

confidence: 99%

Section: Novel Concepts For Infrared Pumpingmentioning

confidence: 99%

See 1 more Smart Citation

Laser‐Driven Strong‐Field Terahertz Sources

Fülöp

Tzortzakis

Kampfrath

2019

Advanced Optical Materials

Self Cite

270

147

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“…Numerous new experiment in THz science have become possible due to the recent availability of THz sources with high values of energy and strength of electric and magnetic fields [1][2][3][4]. High-intense terahertz pulses are generated by various methods, in particular down-frequency conversion, optical rectification of femtosecond laser pulses [1,2,[5][6][7], radiative phenomena of ultra-short, highly charged electron beams in modern linear accelerators [3,8].…”

Section: Introductionmentioning

confidence: 99%

Broadband and narrowband laser-based terahertz source and its application for resonant and non-resonant excitation of antiferromagnetic modes in NiO

et al. 2019

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A versatile table-top high-intense source of terahertz radiation, enabling to generate pulses of both broadband and narrowband spectra with a tunable frequency up to 3 THz is presented. The terahertz radiation pulses are generated by optical rectification of femtosecond pulses of Cr:forsterite laser setup in nonlinear organic crystal OH1. Electric field strengths of broadband and narrowband terahertz pulses were achieved close to 20 MV/cm and more than 2 MV/cm, correspondingly. Experiments on excitation of spin subsystem oscillations of an antiferromagnetic NiO were carried out. Selective excitation of 0.42 THz mode was observed for the first time at room temperature by a narrowband terahertz pulses tuned close to mode frequency.

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“…Multicycle THz radiation has also been extensively studied, and can be produced with quasi-phase matching approaches in a periodically poled lithium niobate (PPLN) [17][18][19][20][21][22][23][24][25][26][27] . Alternative techniques have also been proposed and demonstrated with, e.g., semiconductor-based materials [28][29][30] . Multicycle pulses have also been generated in parametric oscillators 31 .…”

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confidence: 99%

Highly scalable multicycle THz production with a homemade periodically poled macrocrystal

et al. 2020

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The THz regime is widely appealing across many disciplines including solid-state physics, life sciences, and increasingly in particle acceleration. Multicycle THz pulses are typically formed via optical rectification in periodically poled crystals. However the manufacturing procedures of these crystals limit their apertures to below~1 cm, which from damage limitations of the crystal, limits the total pump power which can be employed, and ultimately, the total THz power which can be produced. Here we report on the simple in-house fabrication of a periodically poled crystal using~300 μm thick wafers. Each wafer is consecutively rotated by 180 ∘ to support quasi-phase matching. We validate the concept with a Joule-class laser system operating at 10 Hz and measure up to 1.3 mJ of energy at 160 GHz, corresponding to an average peak power of approximately 35 MW and a conversion efficiency of 0.14%. In addition, a redshifting of the pump spectrum of~50 nm is measured. Our results indicate that high-power THz radiation can be produced with existing and future high-power lasers in a scalable way, setting a course toward multi-gigawatt multicycle THz pulses.

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Efficient semiconductor multicycle terahertz pulse source

Cited by 22 publications

References 36 publications

Laser‐Driven Strong‐Field Terahertz Sources

Laser‐Driven Strong‐Field Terahertz Sources

Broadband and narrowband laser-based terahertz source and its application for resonant and non-resonant excitation of antiferromagnetic modes in NiO

Highly scalable multicycle THz production with a homemade periodically poled macrocrystal

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