Circular grating (a.k.a Flat Axicon)

Circular grating (a.k.a Flat Axicon) is a space-variant retarder that transforms Gaussian beam into a Bessel-Gauss beam. The product is leading for its high damage threshold, compared 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.   

Applications:

• Micromachining
• Ultra-high aspect ratio micro holes drilling
• High 90% efficiency Bragg gratings
• Cutting of transparent materials

Typical Items for Flat Axicons

* Product ID explanation: CG-YYYY-ZZ-XXX.X

CG – circular grating

YYYY – wavelength

ZZ – clear working aperture

XXX.X – apex angle in range 175.0°-179.9° (apex angle limited to diffraction period and depends on a wavelength)

** Custom designs are available on request.