A toroidal mirror is a type of aspherical mirror that has two different curvatures on orthogonal axes. It can be used to focus and fold a light beam, minimizing astigmatism and aberrations.
Some common applications of toroidal mirrors are:
- Spectroscopes and monochromators, where toroidal mirrors can correct for aberrations and astigmatism caused by spherical mirrors.
- Laser beam shaping, where toroidal mirrors can focus and fold a light beam with different curvatures in orthogonal directions
- Yolo telescopes, where toroidal mirrors can form an image of a source that is not on the optical axis of the mirror.