Circular Grating | Flat Axicon Transforms Gaussian beam into a Bessel-Gauss beam

Circular grating, a.k.a flat axicon, is a space-variant retarder that transforms Gaussian beam into a Bessel-Gauss beam.

Main features

Positive and negative Bessel-Gauss zones – 3 in 1 usage possibilities.
Suitable for high LIDT applications and high-power lasers.
Flat optics – saves space, easy to handle.
Reliable and resistant surface – the structure is inside the bulk.

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Circular Grating | Flat Axicon

Detailed description

Circular grating | flat axicon is leading for its high damage threshold, comparing to alternative devices. It has laser irradiation resistance similar to uncoated fused silica substrates.
The structure of the element is unique due to formation birefringent nanograting’s inside a bulk of fused silica glass, sensitive to the incident polarization.

Circular grating can generate both – positive and negative Bessel-Gauss zones, separately with LHCP and RHCP polarizations. Also, positive and negative zones simultaneously with linear polarization. The working regime depends only on incident polarization.

Positive Bessel-Gauss zone

Negative Bessel-Gauss zone

Positive and negative Bessel-Gauss Zone

Fast axis distribution across the element