korn_1998

G. Korn, O. Duehr and A. Nazarkin, “Observation of Raman Self-Conversion of fs-Pulse Frequency due to Impulsive Excitation of Molecular Vibrations”, Phys. Rev. Lett. 81, 1215 (1998)

Source record · Catalogue · Review register

DOI: 10.1103/PhysRevLett.81.1215

Source kind: measurement

Recorded technique: Propagation of 40-fs pulses at 400 nm (frequency doubled, 300 uJ) and 800 nm in a gas-filled hollow waveguide (250 um diameter, 72 cm, ~5 TW/cm2) with SF6 at 0.8-1.6 bar: a pressure-proportional red shift of the spectrum; pump-probe (20-fs probe) shows the 43-fs period of the A1g vibration (775 cm^-1); modelled with an electronic Kerr term plus a driven Raman oscillator (pp. 1215-1217).

Materials in structured entries: None recorded.

Dataset quantities: None recorded.

Contents: 0 datasets; 0 formulas.

Curation notes

Journal pages 1215-1218 = PDF pages 1-4. Identity checked against the first page. SF6 only (Ar is mentioned as a Kerr-only reference, no value). NO DATASET: no n2 or hyperpolarizability is given.

TEXT (notes only; no quantity for these): the A1g Raman mode of SF6 at 775 cm^-1, period T_v = 43 fs (pp. 1215, 1217); from the measured spectral shift ‘we have estimated (d alpha/dQ) for the A1g mode of SF6. For the 400-nm-excitation wavelength its value is 1.5 x 10^-16 cm2 in reasonable agreement with the available experimental data [10]’ (Weber, Raman Spectroscopy of Gases and Liquids) and ~10 % of the molecules excited to v = 1 (p. 1218). Model (Gaussian): P = P_lin + P_electr + P_Raman, P_Raman = N (d alpha/dQ) Q eps, Eq. (3) d^2Q/dt^2 + (2/T2) dQ/dt + Omega_v^2 Q = (1/2M)(d alpha/dQ) eps^2; Eq. (5b) beta_electr = 2 pi N omega chi(3)_electr / cn, beta_Raman = 4 pi^2 N omega (d alpha/dQ)^2 / (M c^2 n^2), I = (cn / 8 pi)|E|^2; Eq. (6): the centre-frequency shift d omega/dz = -(1/2) beta_Raman W, W the pulse energy per area (pp. 1217-1218). Bearing on optmat: SF6’s vibrational Raman response is impulsive for pulses shorter than ~40 fs and adiabatic (part of the instantaneous Kerr response) for longer ones.

Recorded bibliographic identity status: VALIDATED_WITH_WARNINGS. 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.