BESSY II: Ultra-fast switching of helicity of circularly polarized light pulses

At the BESSY II storage ring, a team has shown how the helicity of circularly polarized synchrotron radiation can be switched faster - up to a million times faster than before. They used an elliptical double-undulator and operated the storage ring in the so-called two-orbit mode. This is a special mode of operation that was only recently developed at BESSY II and provides the basis for fast switching.

from Top Technology News -- ScienceDaily https://ift.tt/2yEV0vX