Ruddlesden‒Popper perovskites (RPPs) exhibit exotic carrier-driven optical responses, making them promising materials for advanced optical devices. Here, a numerical study of the electric-field-dependent optical absorption coefficients (OACs) and refractive index changes (RICs) in m = 2 RPP quantum wells (QWs) is presented using the effective-mass-approximation (EMA). Both OACs and RICs are highly tunable by the applied electric-field strength \(\:F\) , showing systematic enhancement with increasing \(\:F\) due to field-induced amplification of the dipole matrix elements. We further analyze, independently, the influence of optical intensity ( \(\:I\) ) and decay rate ( \(\:\gamma\:\) ) under the electric-field. The OACs exhibit weak intensity dependence at F = 0 V/Å but become strongly intensity-sensitive at higher \(\:F\) -values, with a pronounced double-peak structure emerging at F = 0.4 V/Å, indicative of nonlinear absorption and saturation effects. Conversely, the OACs show strong dependence to \(\:\gamma\:\) at low \(\:F\) -values which diminishes as \(\:F\) increases, producing non-monotonic behavior and double-resonance features. The RICs show a similar behavior, but with more moderate variations, reflecting their dispersive and non-resonant nature. These results demonstrate that the external electric-field provides an effective strategy to modulate both absorptive and refractive nonlinearities in RPP QWs, offering valuable guidance for designing tunable hybrid-perovskite photonic and optoelectronic devices.
