Nonlinear Optical Phenomena Induced by Intense Single-Cycle Terahertz Pulses

Hirori, Hideki; Tanaka, Kōichiro

doi:10.1109/jstqe.2012.2221685

Cited by 28 publications

(14 citation statements)

References 125 publications

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“…Generation of high energy ultrashort THz pulses [1] remains an active area of research due to the current and potential applications in nonlinear spectroscopy [2,3] including ultrafast magnetization dynamics study [4], characterization of X-ray and electron ultrashort pulses [1,[5][6][7], and biomedical imaging [9]. Today, high energy near single-cycle THz pulses can be obtained at large scale accelerator facilities (up to 600 J [1]) or by optical rectification of femtosecond laser pulses with tilted pulse fronts (TPF) in lithium niobate (up to 125 J [10]) [11,12].…”

Section: Introductionmentioning

confidence: 99%

Generation of broadband THz pulses in organic crystal OH1 at room temperature and 10 K

Степанов

Ruchert

Levallois

et al. 2014

Opt. Mater. Express

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Abstract:We studied the effects of cryogenic cooling of a 2-[3-(4-hydroxystyryl)-5, 5-dimethylcyclohex-2-enylidene] malononitrile (OH1) crystal on the generation of broadband THz pulses via collinear optical rectification of 1350 nm femtosecond laser pulses. Cooling of the OH1 crystal from room temperature to 10 K leads to a ~10% increase of the pump-to-THz energy conversion efficiency and a shift of the THz pulse spectra to a higher frequency range. Both effects are due the temperature variation of THz absorption and the refractive index of the OH1 crystal. This conclusion has been verified by temperature dependent measurements of the linear absorption in the THz frequency region. An approach to obtain a stronger increase of the THz generation efficiency at cryogenic cooling of the OH1 crystal is discussed. terahertz pulses by optical rectification," Opt. Lett. 37(4), 557-559 (2012). 11. J. Hebling, G. Almási, I. Kozma, and J. Kuhl, "Velocity matching by pulse front tilting for large area THz-pulse generation," Opt. Express 10(21), 1161-1166 (2002). 12. A. G. Stepanov, J. Hebling, and J. Kuhl, "Efficient generation of subpicosecond terahertz radiation by phasematched optical rectification using ultrashort laser pulses with tilted pulse fronts," Appl. Phys. Lett. 83(15), 3000-3002 (2003).

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Section: Introductionmentioning

confidence: 99%

Generation of broadband THz pulses in organic crystal OH1 at room temperature and 10 K

Степанов

Ruchert

Levallois

et al. 2014

Opt. Mater. Express

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“…However, the development of various optoelectronic technologies, such as femtosecond lasers, semiconductors and crystal growth techniques, has enabled the efficient generation and detection of THz waves at high sensitivity. Applications for this type of radiation have expanded into diverse fields such as homeland security 1 , material characterisation 2 , non-destructive testing and analysis 3 , scientific studies 4 and information and communication technology 5 . In addition, THz wave applications in biomedicine are of particular interest, and various studies—such as tissue characterisation 6 , cancer detection 7 8 , burn assessment 9 , hydration sensing 10 , and blood characterisation 11 —have been reported.…”

mentioning

confidence: 99%

Morphology of human sweat ducts observed by optical coherence tomography and their frequency of resonance in the terahertz frequency region

Tripathi

Miyata

Ishai

et al. 2015

Sci Rep

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It is crucial to understand the various biological effects induced by terahertz (THz) electromagnetic waves with the rapid development of electronic and photonic devices operating in the THz frequency region. The presence of sweat glands plays an important role in THz wave interactions with human skin. We investigated the morphological features of sweat ducts using optical coherence tomography (OCT) to further understand such phenomena. We observed remarkable features of the ducts, such as their clear helical structure. The intersubject and intrasubject variations in the diameter of sweat ducts were considerably smaller than the variations in other structural parameters, such as length and number of turns. Based on the sweat duct dimensions and THz dielectric properties of skin measured using terahertz time-domain spectroscopy (THz-TDS), we calculated the resonating frequency of the sweat duct under the assumption of it functioning as a helical antenna. Here, we show that the resonance frequency in the axial mode of operation lies in the THz wave region with a centre frequency of 0.44 ± 0.07 THz. We expect that these findings will further our understanding of the various health consequences of the interaction of THz waves with human beings.

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“…[1][2][3] The generation of high-power or highenergy ultrashort THz pulses is particularly important in THz time-domain spectroscopy (THz-TDS) and THz nonlinear optics. 3,4 The techniques [5][6][7][8][9][10][11] used for THz generation include the use of large-aperture photoconductors, large-size nonlinear crystals, and air-gas plasmas. Optical rectification (OR) 12,13 is also very attractive for this purpose because it offers the possibility of broadband THz pulse generation and up-scaling of the generated THz power/energy via the tilted pulse-front pump (TPFP) technique (a review of this method is given in Ref.…”

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confidence: 99%

Efficient terahertz wave generation from GaP crystals pumped by chirp-controlled pulses from femtosecond photonic crystal fiber amplifier

Chai

Shi

et al. 2014

Applied Physics Letters

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A chirp-tunable femtosecond 10 W, 42 MHz photonic-crystal-fiber oscillator-amplifier system that is capable of delivering sub-60 fs light pulses at 1040 nm is used to demonstrate high-efficiency terahertz radiation generation via optical rectification in GaP crystals only a few millimeters in length. The optimization of the chirp of the fiber-laser pulses is shown to radically enhance the terahertz output, indicating one possible way to more efficiently use these extended nonlinear crystals in compact fiber-pumped terahertz radiation sources.

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Nonlinear Optical Phenomena Induced by Intense Single-Cycle Terahertz Pulses

Cited by 28 publications

References 125 publications

Generation of broadband THz pulses in organic crystal OH1 at room temperature and 10 K

Generation of broadband THz pulses in organic crystal OH1 at room temperature and 10 K

Morphology of human sweat ducts observed by optical coherence tomography and their frequency of resonance in the terahertz frequency region

Efficient terahertz wave generation from GaP crystals pumped by chirp-controlled pulses from femtosecond photonic crystal fiber amplifier

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