Maker fringes in the Terahertz radiation produced by a 2-color laser field in air

Liu, Y.; Houard, Aurélien; Durand, Magali; Prade, B.; Mysyrowicz, A.

doi:10.1364/oe.17.011480

Cited by 34 publications

(19 citation statements)

References 11 publications

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“…The MIR generation technique, FWM of the fundamental and SH of Ti:sapphire amplifier output, is essentially identical to those used for THz generation [23][24][25][26][27][28][29][30][31][32][33][34][35][36]. Here we discuss the difference between the MIR generation and the THz generation experiments.…”

Section: Power (Arb Units)mentioning

confidence: 99%

“…The second point is the adjustment of the relative delay and polarization of the input pulses. At the THz generation experiments in the references [23][24][25][26][27][28][29][30][31][32][33][34][35], only the angles of the BBO crystal for the SHG can be adjusted to optimize the efficiency of the wavelength conversion. In this case, the freedom to control the relative delay and polarizations of the fundamental and SH pulses is seriously limited.…”

Section: Power (Arb Units)mentioning

confidence: 99%

“…This means that the conversion efficiency of FWM can be significantly improved with a filamentation effect. Wavelength conversion of Ti:sapphire laser output by using FWM through filament to ultraviolet [13][14][15][16], visible [17], infrared [18][19][20][21][22], and terahertz (THz) [23][24][25][26][27][28][29][30][31][32][33][34][35][36] regions were demonstrated so far.…”

Section: Introductionmentioning

confidence: 99%

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Generation of Phase-Stable Sub-Cycle Mid-Infrared Pulses from Filamentation in Nitrogen

Fuji

Nomura

2013

Applied Sciences

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Sub-single-cycle pulses in the mid-infrared (MIR) region were generated through a laser-induced filament. The fundamental (ω 1 ) and second harmonic (ω 2 ) output of a 30-fs Ti:sapphire amplifier were focused into nitrogen gas and produce phase-stable broadband MIR pulses (ω 0 ) by using a four-wave mixing process (ω 1 + ω 1 − ω 2 → ω 0 ) through filamentation. The spectrum spread from 400 cm −1 to 5500 cm −1 , which completely covered the MIR region. The low frequency components were detected by using an electro-optic sampling technique with a gaseous medium. The efficiency of the MIR pulse generation was very sensitive to the delay between the fundamental and second harmonic pulses. It was revealed that the delay dependence of the efficiency came from the interference between two opposite parametric processes, ω 1 + ω 1 − ω 2 → ω 0 and ω 2 − ω 1 − ω 1 → ω 0 . The pulse duration was measured as 6.9 fs with cross-correlation frequency-resolved optical gating by using four-wave mixing in nitrogen. The carrier-envelope phase of the MIR pulse was passively stabilized. The instability was estimated as 154 mrad rms in 2.5 h.

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Section: Power (Arb Units)mentioning

confidence: 99%

Section: Power (Arb Units)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Generation of Phase-Stable Sub-Cycle Mid-Infrared Pulses from Filamentation in Nitrogen

Fuji

Nomura

2013

Applied Sciences

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“…The reason is as follows that we use the data of the THz pulses propagating along the −x direction. The strength of the THz pulse propagating along the +x direction depends on gas length due to laser/THz absorption and propagation effects [39]. However, the strength of the one propagating along the −x direction is not varied with gas length providing it is longer than half of a plasma wavelength [32,40].…”

Section: Appendix: Parameters and Setup Of Pic Simulationsmentioning

confidence: 99%

Terahertz radiation by two-color lasers due to the field ionization of gases

Wang

Sheng

et al. 2013

Phys. Rev. E

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Terahertz (THz) radiation via the two-color laser scheme is investigated theoretically and numerically when the second laser is at different harmonic orders of the main laser. It is found that THz radiation can be generated only when the second laser is an even harmonic and the THz field strength does not show a simple scaling with the two laser amplitudes, suggesting that it is different from a nonlinear optics processes. The THz strength generally tends to decrease with the increase of the even harmonic order. The strength is also sensitive to the carrier envelope (CE) phases of both the two laser pulses even if their durations are quite long. With different CE phases, the strength can be proportional to either sine or cosine of the relative phase displacement of the two lasers. For a given gas target except hydrogen, it increases with the laser amplitude between several saturation plateaus, each corresponding to a different ionization level. For a given main laser intensity, there is an optimized intensity of the second laser for the strongest THz radiation.

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“…The difficulties are tied to the process of filamentation, which appears unavoidably when P > P cr and generates an extended plasma column. In order to produce THz radiation efficiently, proper phase relation and temporal overlap between the  and 2 pulses must be maintained over the plasma length [19][20][21]. For instance, the THz emission produced by this two-color method at a distance of 55 m was only a small fraction of that at shorter distance, due to walk-off between fundamental and harmonic pulse [19].…”

mentioning

confidence: 99%

Coherent synthesis of terahertz radiation from femtosecond laser filaments in air

Mitryukovskiy¹,

Liu²,

Prade³

et al. 2013

Applied Physics Letters

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International audienceWe report on the coherent synthesis of pulsed terahertz radiation from femtosecond laser filaments organized in an array. The terahertz intensity is proportional to the square of the number of the filaments, which provides a simple method for scaling up of the terahertz energy with a powerful femtosecond laser. Moreover, directional off-axis terahertz radiation can be achieved. This paves the way for applications of this terahertz source for remote sensing

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Maker fringes in the Terahertz radiation produced by a 2-color laser field in air

Cited by 34 publications

References 11 publications

Generation of Phase-Stable Sub-Cycle Mid-Infrared Pulses from Filamentation in Nitrogen

Generation of Phase-Stable Sub-Cycle Mid-Infrared Pulses from Filamentation in Nitrogen

Terahertz radiation by two-color lasers due to the field ionization of gases

Coherent synthesis of terahertz radiation from femtosecond laser filaments in air

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