.

The Voigt Effect, sometimes termed magnetic birefringence or magnetic double refraction, is a magneto-optical phenomenon whereby the polarization of light may be rotated when passed through a vapor cell immersed in a magnetic field directed perpendicular to the beam direction.

This effect is utilized in Voigt filters, a type of Atomic line filter. In this circumstance, the Voigt Effect makes the vapor cell act as a half wave plate.

References

* Zhao, Zhong-Quan. Excited state atomic line filters. Retrieved March 26, 2006.