Abstract
Photon-photon scattering in a vacuum1 is perhaps one of the most fundamental mechanisms which can give rise to nonlinear optical effects. This interaction may contribute to the birefringence of the refractive index2 seen by a probe field under the action of either a dc magnetic (or electric) field or intense laser pumping as well as to multiwave mixing processes.3 Here we demonstrate the feasibility of new nonlinear magnetooptical effects in a vacuum that gives rise to optical second harmonic generation (SHG) of the fundamental wave under the action of both strong dc magnetic field H0 and high intensity optical laser radiation.4
© 1990 Optical Society of America
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