Dephasing in steady-state and time-varying spectroscopy
D'yakov Yu. E.
The Green's function h (t) describing the temporal response of a medium to a resonant field is determined for arbitrary pressures ρ and for an arbitrary dephasing correlation В (τ). The increase in the dephasing time corresponding to Dicke contraction and the identification of В (τ) from h (t) are discussed. The theory agrees with data from picosecond coherent anti-Stokes Raman spectroscopy of hydrogen at pressures in the range ρ = 10~2-10 atm.