In many applications, spherical mirrors, cylindrical mirrors, and parabolic mirrors help shape the laser beam. Biconic mirrors -- or the more general toroidal mirrors -- can combine two separate optics into one.
Biconic mirrors have two different radii on one surface. It is possible to make a biconic mirror with spherical curves or aspheric curves, depending on the application and need to eliminate aberrations. When appropriately designed, they can replace common 90° bending mirrors to recollimate a laser beam in a long delivery path.
- Biconic optical power can be placed on one surface.
- Curves can be designed to produce diffraction-limited focus at 45º AOI.
- Useful in anamorphic beam expanders.
- As a focusing mirror at 0º AOI, it will produce elliptically shaped spots.
- Curvatures can be spherical or aspherical.