Booton, G., Wasawo, T., Davis, W., McGarry, C., Rusimova, K., Davis, A., Nunn, J., Mosley, P., 2026. Dataset for "Cavity-based optical switching via phase modulation in rubidium warm vapor". Bath: University of Bath Research Data Archive. Available from: https://doi.org/10.15125/BATH-01582.