  In this paper two-photon absorption coefficient $\beta$ and nonlinear
refractive index ${n}_{2}$ have been measured at 1064 nm for a new
two-dimensional (CH3(CH2)2NH3)2(CH3NH3)2Pb3Br10 hybrid perovskite. The
nonlinear optical properties were measured using transmission and reflection
F-scan techniques. As a reference, a three-dimensional CH3NH3PbBr3 has been
used. As expected, the values obtained for ${n}_{2}$ and $\beta$ show a
difference between these two materials. The figure of merit for both, three
dimensional and two-dimensional perovskites are F=0.31 and F=0.04,
respectively, implying that these materials can be used in photonics
applications such as optical limiting devices and all-optical switching.
