Absorption spectroscopy of 85Rb atoms at 420 nm: Pressure broadening with N2 buffer gas and saturation intensity

We experimentally measure the pressure broadening coefficient of absorption linewidth in the ⁸⁵Rb 5²S_1/2-6²P_3/2 transition (420 nm wavelength) due to collisions with N₂ buffer gas. In addition, we measure the saturation intensities of this atomic transition without buffer gas and related with it hyperfine ground state relaxation time. We also calculated the hyperfine ground state relaxation times and saturation intensities in the presence of N₂ buffer gas.