Double frequency scattering section and power broadening of laser pulse scattering from dielectric film

According to the mean roughness and semisphere reflectivity of the gold plated polyester film surfaces, and based on the Kirchhoff’s approximation along with the pulse scattering mutual coherence function(MCF), we computed the double frequency scattering section(DFSS) changing with coherence bandwidth frequency difference and scattering angle for different incident angles of a laser (1.06 μm). For δ and Gaussion pulses incidence, scattering power patterns have been obtained with different scattering angle and time by two frequency MCF. The numerical results show that there exists a maximal DFSS in the mirror reflection direction. While the DFSS will decrease rapidly in the diffusing scattering direction with the increase of coherence bandwidth frequency difference. As to vertical inci