Axicon Mirror

Axicon mirror is a specialized type of mirror that has a conical surface; it can be converging or diverging depending on the sign of its angle θ.

The axicon mirror has the same matrices for both planes when the beam falls at the normal angle. When incident beam inclined at angle α, then matrices for T and S planes differ.

Because the ray matrix depends on the radius of the incident beam r, this element can be used effectively only in single-pass schemas where a beam radius is known from the beginning. In resonators, it operates as a plane or a point, having a unity matrix. (It’s not about the real axicon, it’s just a convention of the software.)

The axicon mirror acts in the same way as axicon lens, except that you don’t have to specify an index of refraction. Even on the layout, it is displayed as a lens when not located at the ends of the optical system.

Note

In real optical systems, axicons used to turn a Gaussian beam into a non-diffractive Bessel-like beam. But rezonator can’t calculate such beams, so the result of calculation of schemas with axicons is only mathematically correct, but hardly can be correlated with real situations.

See also

Elements Matrices, ../catalog, ../elem_props, Axicon in Wikipedia