Ring-Shaped Bessel Beam
based on
Diffractive Axicon
A diffractive axicon converts a laser beam into a ring-shaped Bessel beam. Typically diffractive axicons have no influences on the ring beam's width. The beam width depends on the incident beam and focal lenses. Specifically, the width of the ring-shaped beam at a certain position is equal to half the beam's width when you take the diffractive axicon out from the optical path.
The main parameters of a diffractive axicon are the base angle α (also referred to as axicon angle) and wavelength λ. Obviously the relationship between base angle α and apex angle (also referred to as cone anlge) θ is
The half fan angle after a laser beam passes a diffractive axicon is:
where n is the refractive index of the material of diffractive axicon. Full fan angle (Ring angle, P2P）is twice the half fan angle, i.e.
The diameter of the ring is:
where L is the working distance.
Collimation integrated DOEs for VCSEL Array
Homogenizers tolerant to incident beam size and beam quality
Image generation (general beam shaping) elements
8-Phase-level diffractive lens with super long focal length
Phase gratings for optical linear encoders
DOEs for motion sensing and gesture recognition systems
Design of highly random structured light pattern
Laser keyboard by a diffractive optical element
DOEs, MEMS and other microstructures replication
Fused silica, quartz and sapphire wafers
TIFF / BMP to GDSII conversion
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