Calculations on the Hanle effect in a J - J:i atomic transition are performed for laser fields with a) Brownian motion phase diffusion b) Gaussian amplitude fluctuations and c) fluctuating real and imaginary parts of the laser electric field amplitude (chaotic field model). We use the Fokker-Planck operator approach to stochastic differential equations. The zero-field level-crossing dip broadens at high laser intensity significantly less so as the laser bandwidth increases or if the amp]itu(le fluctuates.
Thomas H. Bergeman,
Robert E. Ryan,
"Calculations on the Hanle effect with phase and amplitude fluctuating laser fields", Proc. SPIE 1376, Laser Noise, (1 March 1991); doi: 10.1117/12.25009; https://doi.org/10.1117/12.25009