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Flat Axicons

Flat Axicons

Material

UVFS, IRFS

Wavelength range

330 – 2000 nm

Min Apex angle

176 – 179.9° @ 1030 nm

Diffraction efficiency

~95%

Uncertainty of cone tip diameter

~20 μm

Clear aperture size

up to Ø15 mm

Total transmission (without AR coating)

>94% @ 1030 nm; >92% @ 515 nm; >85% @ 343 nm

Coating (optional)

Anti-reflective AR/AR coatings

LIDT

>60 J/cm2 @ 1064 nm, 10 ns

LIDT

>2 J/cm2 @ 1030 nm, 212 fs

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Typical Items for Flat Axicons

Operational wavelength, nm Clear aperture, mm Product ID*
343/355 2 CG-0343-02-XXX.X
4 CG-0343-04-XXX.X
6 CG-0343-06-XXX.X
8 CG-0343-08-XXX.X
10 CG-0343-10-XXX.X
15 CG-0343-15-XXX.X
488 2 CG-0488-02-XXX.X
4 CG-0488-04-XXX.X
6 CG-0488-06-XXX.X
8 CG-0488-08-XXX.X
10 CG-0488-10-XXX.X
15 CG-0488-15-XXX.X
515/532 2 CG-0515-02-XXX.X
4 CG-0515-04-XXX.X
6 CG-0515-06-XXX.X
8 CG-0515-08-XXX.X
10 CG-0515-10-XXX.X
15 CG-0515-15-XXX.X
632 2 CG-0632-02-XXX.X
4 CG-0632-04-XXX.X
6 CG-0632-06-XXX.X
8 CG-0632-08-XXX.X
10 CG-0632-10-XXX.X
15 CG-0632-15-XXX.X
780/800 2 CG-0800-02-XXX.X
4 CG-0800-04-XXX.X
6 CG-0800-06-XXX.X
8 CG-0800-08-XXX.X
10 CG-0800-10-XXX.X
15 CG-0800-15-XXX.X
1030/1064 2 CG-1030-02-XXX.X
4 CG-1030-04-XXX.X
6 CG-1030-06-XXX.X
8 CG-1030-08-XXX.X
10 CG-1030-10-XXX.X
15 CG-1030-15-XXX.X
1550 2 CG-1550-02-XXX.X
4 CG-1550-04-XXX.X
6 CG-1550-06-XXX.X
8 CG-1550-08-XXX.X
10 CG-1550-10-XXX.X
15 CG-1550-15-XXX.X

* 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.

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, 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.

 

Applications:

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

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