pi = 3.141592653589793 c = 299792458. #m/s hbar_Jsec = 1.054571726E-34 #Jsec n_benzene = 1.5011 n_freespace = 1.00 wavelength_L = 694.0E-9 #m nu_0 = 992.0 #cm-1 delta_nu = 2.15 #cm-1 cross_section = 3.06E-6 #1/(m*sr) prefactor = (4.0*(pi**3)*(c**2)) / (hbar_Jsec*(n_benzene**2)) omega_L = 2.0*pi*c/(n_freespace*wavelength_L) omega_S = omega_L - 2.0*pi*c*nu_0*100.0/n_freespace delta_omega = 2*pi*c*100.0*delta_nu/n_freespace gain_to_incident_intensity_ratio = (prefactor*cross_section*1.0E+12) / (delta_omega*omega_L*(omega_S**2)) print gain_to_incident_intensity_ratio
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