GRIN Media Modeling
Optical media with gradually changing refractive index are commonly found in practical optical systems. The thermal effects either weak or strong are present in almost all cases. The non-negligible thermal usually give rise to a modulation of the refractive index, which functions as a graded-index (GRIN) medium. An efficient treatment based on the Runge-Kutta method has been developed as a regional solver for GRIN medium, and that enables the accurate evaluation of the system performance with e.g. the thermal lens effect into consideration.