Fig. 3: Time-dependence of the 2M Raman scattering intensity.

Integrated intensity in Fig. 2 from 2500 cm⁻¹ to 3000 cm⁻¹ covering the main \(x^{\prime}y^{\prime}\) two-magnon peak (a) and from 1000 cm⁻¹ to 1500 cm⁻¹ (b) at various delay times, relative to the intensity at t = −1000 fs (labeled ΔI). Inset shows integrated intensity in the \(x^{\prime}x^{\prime}\) geometry from 1000 cm⁻¹ to 1500 cm⁻¹. The solid lines are fits to a biexponential function. The time constant in a is 1040 fs. In b the fast decay time constant is 675 fs and the slow decay constant is over 50 ps for the inset. The noise is mainly due to fluctuations in beam pointing.