Design and manufacture of diffractive
optical elements

Spiral phase plate (Vortex) for lasers


A Spiral phase plate converts a Gaussian input profile into a donut-shaped energy ring.
The spiral phase plate is a unique optic, whose structure is composed entirely of spiral or helical phase steps, whose purpose is to control the phase of the transmitted beam.
The topological charge, denoted in the literature as m, refers to the number of 2p cycles (i.e. "staircases") etched around 360° turn of diffractive surface. One main effect of a higher topological charge is an increase in the angular momentum of the vortex beam by a factor of m. Another effect is the dimensions magnification of the ring intensity pattern, by a factor of m.

For Multi Mode laser or very large ring diameter, we generally recommend to use our diffractive axicon: Click here for more information on Diffractive Axicon.
Spiral Phase Plate (Vortex)Spiral phase plate (Vortex)
Ring - Donut-shaped energyDonut-shaped energy ring
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example: VL-209-I-Y-A

Materials:Fused Silica, ZnSe, Plastic
Wavelength range:193nm to 10.6um
DOE design:2-level (binary) to 16-level
Diffraction efficiency:75% - 96%
Element size:Few mm to 100mm
Coating (optional):AR/AR Coating
Topological charge:Standard from 1 to 6. Other under request
Damage threshold:~3 J/cm2 in 7nS pulse at 1064nm
Features:
  • High power threshold
  • High efficiency
  • Low back reflection
  • Wavelengths from UV to IR
  • Optional Ar/Ar coating
  • Any topological charge
Applications:
  • Astronomy
  • Optical tweezers
  • Encryption
  • Microscopy
  • Lithography
vortex topological charge - spiral phase plate
Surface profiles for Spiral Phase Plate (Vortex) with m=2, m=3 and m=4
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Phone: +972-89409687/8, Fax: +972-89409606

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