  The effect of vacuum birefringence in a magnetic field generated by a
laser-driven capacitor-coil generator as well as in field of an electromagnetic
wave in a radioguide has been theoretically considered. The resulting
ellipticity of a linearly polarized laser beam propagating in the considered
field configuration is calculated. The obtained results are compared to the
parameters of the PVLAS experiment which aims to observe the effect of magnetic
vacuum birefringence experimentally.
