Tunable Ultrashort Laser Pulses Generated through Filamentation in Gases

Théberge, F.; Aközbek, Neşet; Liu, Weiwei; Becker, Andreas; Chin, See Leang

doi:10.1103/physrevlett.97.023904

Cited by 200 publications

(98 citation statements)

References 17 publications

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“…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%

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: Introductionmentioning

confidence: 99%

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

Fuji

Nomura

2013

Applied Sciences

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“…[12] but have not been published in an archival journal. A somewhat similar role was played by FWM in the experiment reported in [13], which demonstrated efficient, filament-aided conversion of mid-infrared radiation into the visible. The features that distinguish the physics discussed here are that the seed energies are exceedingly small, and that the supercontinuum enhancement extends well beyond the discrete frequencies dictated by the FWM process.…”

Section: Introductionmentioning

confidence: 66%

Numerical investigation of enhanced femtosecond supercontinuum via a weak seed in noble gases

Shanor¹,

Ensley²,

Hagan³

et al. 2016

Opt. Express

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Abstract:Numerical simulations are employed to elucidate the physics underlying the enhanced femtosecond supercontinuum generation previously observed during optical filamentation in noble gases and in the presence of a weak seed pulse. Simulations based on the metastable electronic state approach are shown not only to capture the qualitative features of the experiment, but also reveal the relation of the observed enhancement to recent developments in the area of sub-cycle engineering of filaments. and nonlinear response for high-intensity optical pulses," Optica 1, 323-331 (2014).

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“…Additionally, doubling the fundamental harmonic ellipticity led to a doubling of the THz harmonic ellipticity. The THz radiation beam at the filament generation had high spatial homogeneity in the center of the filament [31]. Besides, the THz field propagation from the filament had a conical structure [29] that created a "donut" vortex beam shape after collimation.…”

Section: Experimental Setup and Resultsmentioning

confidence: 98%

Detection of the polarization spatial distribution of THz radiation generated by two-color laser filamentation

Smirnov¹,

Kulya²,

Tcypkin³

et al. 2017

Nanosystems: Phys. Chem. Math.

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The spatial distribution of the terahertz radiation polarization is experimentally measured from a femtosecond laser two-color filament in air. Terahertz radiation generation from two-color plasma filamentation with a β-BBO crystal located behind the lens leads to the spatial inhomogeneity of the polarization distribution. Inhomogeneity of the terahertz field polarization is determined by the polarization of the fundamental harmonic of the pump radiation after passing through the β-BBO crystal. A spatial inhomogeneity of the fundamental harmonic polarization is observed owing to the β-BBO crystal acting as a phase plate illuminated by a spherical front.

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Tunable Ultrashort Laser Pulses Generated through Filamentation in Gases

Cited by 200 publications

References 17 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

Numerical investigation of enhanced femtosecond supercontinuum via a weak seed in noble gases

Detection of the polarization spatial distribution of THz radiation generated by two-color laser filamentation

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