In many applications, spherical mirrors, cylinder mirrors, and parabolic mirrors are used to help shape the laser beam. Biconic mirrors—or the more general toroidal mirrors—can be used to combine two separate optics into one.
Biconic mirrors have two different radii on one surface. It’s possible to make a biconic mirror with spherical curves or aspheric curves, depending on the application and need to eliminate aberrations. Toroids can replace common 90° bend mirrors to recollimate a laser beam