bejot_2013

P. Bejot, E. Cormier, E. Hertz, B. Lavorel, J. Kasparian, J.-P. Wolf and O. Faucher, Phys. Rev. Lett. 110, 043902 (2013)

Source record · Catalogue · Review register

DOI: 10.1103/physrevlett.110.043902

Source kind: theory

Recorded technique: Full 3D time-dependent Schroedinger equation for atomic hydrogen (B-spline basis, velocity gauge unless stated) in 800 nm pulses of 23-93 fs (24-96 cycles), compared with the Kerr-plus-Drude (KD) model with a PPT ionisation rate scaled to the TDSE’s final electron density.

Materials in structured entries: None recorded.

Dataset quantities: None recorded.

Contents: 0 datasets; 0 formulas.

Curation notes

No datasets: the only species is atomic hydrogen, which is not curated, and the results are shown in figures only (the nonlinear polarizability Delta alpha(I0) = alpha(I0) - alpha(0), Eqs. 3-6, against peak intensity).

Conventions: p(t) = <psi| r cos theta |psi>, alpha(w0) = p(w0)/E(w0) (Eqs. 3-4), P = N p; the KD model is P_NL,KD = eps0 [n2 I(t) - rho(t)/rho_c] E(t) (Eq. 7), with n2 ‘the intensity-independent nonlinear index ... extracted from TDSE calculations at weak intensity’ (no value printed).

Higher-order Kerr claim (notes only): the TDSE nonlinear polarizability of hydrogen rises linearly with intensity, saturates and changes sign near 30 TW/cm^2, beyond the KD model, the excess following the fourth power of the intensity after the 10-photon channel closure at about 32 TW/cm^2; the authors identify this ‘quasi-instantaneous’ negative contribution with the empirical higher-order Kerr effect of Loriot et al. (p. 3-4), and quote channel-closure intensities of 21.5 and 48 TW/cm^2 (Ar), 32 and 57 TW/cm^2 (O2), 25 and 51 TW/cm^2 (N2) (p. 4, no source given). They also note that the saturation appears only within the pump bandwidth, consistent with the two-colour measurements (Wahlstrand et al.) that see no saturation, and that ‘plasma grating effects could have a partial contribution’ (p. 4). Status: a theoretical support for a transient negative contribution tied to ionisation in a single atom, not a set of Kerr coefficients; the measured bound-electron response of real gases stays linear in intensity up to ionisation (Wahlstrand et al. 2012, 2018). Nothing to take.

Recorded bibliographic identity status: VALIDATED. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets

No datasets are recorded.

Formulas

No formulas are recorded.

Corrections

No dataset errata are recorded in this source record.

Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the review register for the checks and decisions.