In the previous paper "Optical and Judd-Ofelt spectroscopic study of Er3+-doped strontium gadolinium gallium garnet single-crystal" (J Am Ceram Soc. 2019;102:873-878), we have reported optical and Judd-Ofelt spectroscopic properties of Er3+-doped strontium gadolinium gallate (SrGdGa3O7) single-crystal, and the Judd-Ofelt study was performed on the basis of unpolarized absorption spectrum of the crystal. Present work reports the corrected unpolarized absorption spectrum and Er3+ concentration in the crystal, and hence corrected Judd-Ofelt spectroscopic properties and cross-section data. In addition, the polarization effect was considered in the Judd-Ofelt analysis on the basis of polarization-resolved absorption spectra. Effective Judd-Ofelt parameters are presented and discussed in comparison with the results from the unpolarized spectrum, and consistent results have been obtained. This study also considers the effects of some other factors on the Judd-Ofelt parameters. These include Er3+ concentration and selection of Er3+ absorption bands for the Judd-Ofelt analysis.