OptiBPM would be the software of choice for #1 and #3. For #2 it depends on what exactly you want to simulate and in fact since I believe you would want information about the cavity (reflections) you would need to use an FDTD approach (OptiFDTD).
OptiBPM would be the software of choice for #1 and #3. For #2 it depends on what exactly you want to simulate and in fact since I believe you would want information about the cavity (reflections) you would need to use an FDTD approach (OptiFDTD).