We have been working on an interferometric method for high-efficiency synthesis of cylindrical vector beams.
These are the class of laser beams that are linearly polarized in a cylindrical basis, the most common examples being beams where the polarization is purely radial or purely azimuthal.
The latest movie from this experiment is here and on our YouTube channel. In this movie you can see the characteristic 'donut' shape of the beam and the intensity transmission pattern through a polaroid which demonstrates the radial and azimuthal polarization states. These beams have many applications in, for example, high-resolution miroscopy and optical trapping.