Mechanism of hollow-core-fiber infrared-supercontinuum compression with bulk material

Béjot, Pierre; Schmidt, Bruno E.; Kasparian, Jérôme; Wolf, Jean‐Pierre; Légaré, François

doi:10.1103/physreva.81.063828

Cited by 44 publications

(26 citation statements)

References 20 publications

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“…This additional phase asymmetry on top of the symmetric SPM is nicely opposed by the TOD of bulk material. This intuitive physical explanation was verified by numerical modelling of nonlinear propagation in the HCF and linear propagation in FS afterwards [29]. It is worth mentioning that self-steepening results from a nonlinear polarization of the argon gas without the need for plasma generation.…”

Section: Experimental Methodsmentioning

confidence: 89%

“…In this paper, we show that spectral broadening in an argonfilled HCF followed by a proper dispersion compensation scheme (CM at 1.4 μm and a fused silica window at 1.8 μm [28]) is a robust and simple approach to obtain few-cycle IR pulses. It can be extended to even longer wavelengths, as long as glasses are not absorbing [29]. In addition, starting with a white light seeded optical parametric amplifier provides passive CEP stabilization [30].…”

Section: Introductionmentioning

confidence: 99%

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High harmonic generation with long-wavelength few-cycle laser pulses

Schmidt¹,

Shiner²,

Giguère³

et al. 2012

J. Phys. B: At. Mol. Opt. Phys.

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We report the extension of hollow-core fibre pulse compression to longer wavelengths. High-energy multi-cycle infrared pulses are generated via optical parametric amplification and subsequently broadened in the fibre. 2.5-cycle pulses at the Signal wavelength (1.4 μm) and 1.6-cycle pulses at the Idler wavelength (1.8 μm) in the sub-millijoule regime have been generated. New compression schemes can be applied at 1.8 μm and beyond. In this manner, 1.6-cycle carrier envelope phase stable pulses were generated by linear propagation in the anomalous dispersion regime of bulk glass which surprisingly enables compression below its third-order dispersion limit. Furthermore, a dispersion-free way of controlling the carrier envelope phase is demonstrated. Moreover, we experimentally confirm the increase in high-harmonic cut-off energy with driving laser wavelength and demonstrate the beneficial effect of few-cycle pulses which enable higher saturation intensities on target compared to multi-cycle pulses. It will be an ideal tool for future synthesis of isolated attosecond pulses in the sub-keV regime. With this laser source, we revealed for the first time multi-electron effects in high harmonic generation in xenon.

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Section: Experimental Methodsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

High harmonic generation with long-wavelength few-cycle laser pulses

Schmidt¹,

Shiner²,

Giguère³

et al. 2012

J. Phys. B: At. Mol. Opt. Phys.

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show abstract

“…In the HOK model, where the nonlinear refractive index is defined by n Kerr = n 2 I + n 4 I 2 + n 6 I 3 + n 8 I 4 , the saturation and inversion of the electronic Kerr index are due to negative n 4 and n 8 terms. It is well known that the optical Kerr effect plays a central role in the nonlinear propagation of short and intense laser pulses such as selfphase modulation, self-focusing, pulse compression, and laser filamentation [9][10][11][12][13]. The potential impact of the HOK model on the last process was presented in Refs.…”

Section: Introductionmentioning

confidence: 99%

Interpretation of negative birefringence observed in strong-field optical pump-probe experiments: High-order Kerr and plasma grating effects

et al. 2013

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The analysis of negative birefringence optically induced in major air components (Loriot et al., [1,2]) is revisited in light of the recently reported plasma grating-induced phase-shift effect predicted for strong field pump-probe experiments (Wahlstrand and Milchberg,[3]). The nonlinear birefringence induced by a short and intense laser pulse in argon is measured by femtosecond time-resolved polarimetry. The experiments are performed with degenerate colors, where the pump and probe beam share the same spectrum, or with two different colors and non-overlapping spectra. The interpretation of the experimental results is substantiated using a numerical 3D+1 model accounting for nonlinear propagation effects, cross-beam geometry of the interacting laser pulses, and detection technique. The model also includes the ionization rate of argon and high-order Kerr indices introduced by Loriot et al. enabling to assess the contribution of both terms to the observed effect. The results show that the ionization-induced phase-shift has a minor contribution compared to the high-order Kerr effect formerly introduced, the latter allowing a reasonably good reproduction of the experimental data for the present conditions.

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“…Furthermore, in argon-filled hollow-core fibers, these terms are necessary to obtain quantitative agreement of numerical simulations with experimental data [12,13]. But these works focused on the contribution of higher-order Kerr terms to phase velocity.…”

mentioning

confidence: 99%

“…As described in detail earlier [13], the model implements the NLSE, including the higher-order Kerr terms. We compared the code output with and without the contribution of the higherorder indices to the group-velocity index up to the term in n 10 , i.e., the terms of Eq.…”

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confidence: 99%

Arbitrary-order nonlinear contribution to self-steepening

2010

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On the basis of the recently published generalized Miller formulas, we derive the spectral dependence of the contribution of arbitrary-order nonlinear indices to the group-velocity index. We show that in the context of laser filamentation in gases, all experimentally accessible orders (up to the ninth-order nonlinear susceptibility χ ð9Þ in air and χ ð11Þ in argon) have contributions of alternative signs and similar magnitudes. Moreover, we show both analytically and numerically that the dispersion term of the nonlinear indices must be considered when computing the intensity-dependent group velocity.

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Mechanism of hollow-core-fiber infrared-supercontinuum compression with bulk material

Cited by 44 publications

References 20 publications

High harmonic generation with long-wavelength few-cycle laser pulses

High harmonic generation with long-wavelength few-cycle laser pulses

Interpretation of negative birefringence observed in strong-field optical pump-probe experiments: High-order Kerr and plasma grating effects

Arbitrary-order nonlinear contribution to self-steepening

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