Question

Is there an irradiance limit a laser can have in air due to the dielectric strength of air or does the dielectric strength of air only limit the frequency of light it is possible to use?

Answer 1

Laser can have a limit of its irradiance due to the dielectric strength of air, for instance, due to self-focusing, filamentation and breakdown effects. The dielectric strength of air cannot affect on frequency of light, only on its speed.