Output property of a nonlinear Fabry-Perot interferometer

This paper discusses the output property of a Fabry-Perot interferometer filled with a nonlinear medium. Because of the optical-field-induced refractive index, the transmissivity across monochromatic beam through the interferometer depends on the distribution of the beam intensity. The output beam is different from the input. As the reflectivity of two mirrors increases, the distinction changes clear, and there is a change close to discontinue.