Axicon Bessel Beam Visualizer

Apex Angle (°): 170

Bessel Beam (Top View)

How it works: Adjust the apex angle to see how the axicon lens transforms a collimated beam into a Bessel beam.
Left: Input beam | Middle: Axicon lens | Right: Output Bessel beam (side view)
Reference Equations:
α = arctan(A₁ / l)
d = 2 · l · tan(α) · (n - 1)
R = ∞ → 2(h) = A₁ · h
Cone angle = 180° - 2α where α is the physical angle, l is the axicon length, n is the refractive index, d is the ring diameter, h is the height, and A₁ is a geometric parameter.