The nonlinear optical responses of perovskite films CsPbI₂Br, MAPbI₃ + 1% PVC, MA_0.15FA_0.75Cs_0.1PbI_2.85Br_0.15, and MA_0.15FA_0.75Cs_0.1PbI₃, irradiated by femtosecond laser pulses with wavelengths of 1064 and 532 nm, are investigated using z-scan measurements. Nonlinear absorption is found to occur in perovskite films irradiated at a wavelength of 1064 nm; the nonlinear absorption coefficient in thin films (45 – 65 nm) greatly exceeds that in thick ones (120 – 350 nm): 524 – 928 and 38 – 50 cm GW⁻¹, respectively. It is shown that the nonlinear absorption saturation intensity for perovskite films depends on the pump pulse duration and increases with pulse shortening. It is also established that the nonlinear absorption coefficient of organometallic perovskite films exceeds that of a film of inorganic perovskite CsPbI₂Br. Bleaching of film samples during z-scanning at a wavelength of 532 nm is related to the irreversible photochemical degradation of films exposed to intense light. The kinetics of photochemical bleaching of the films is detected at a wavelength of 532 nm.

CsPbI的钙钛矿薄膜的非线性光学响应₂ BR，MAPbI ₃ + 1％PVC，MA _0.15 FA _0.75铯_0.1碘化铅_2.85溴_0.15和MA _0.15 FA _0.75铯_0.1碘化铅₃，由飞秒激光脉冲1064和532的波长照射nm，使用z扫描测量进行研究。发现在 1064 nm 波长照射的钙钛矿薄膜中发生非线性吸收；薄膜（45 – 65 nm）的非线性吸收系数大大超过厚膜（120 – 350 nm）：524 – 928 和 38 – 50 cm GW ^-1， 分别。结果表明，钙钛矿薄膜的非线性吸收饱和强度取决于泵浦脉冲持续时间，并随着脉冲缩短而增加。还确定有机金属钙钛矿薄膜的非线性吸收系数超过无机钙钛矿 CsPbI ₂ Br薄膜的非线性吸收系数。在波长为 532 nm 的z扫描期间，薄膜样品的漂白与暴露于强光下的薄膜的不可逆光化学降解有关。在 532 nm 波长处检测薄膜的光化学漂白动力学。