An optical vortex – also known as twisted light – is a special type of beam that carries orbital angular momentum. The phase of such beam changes with the azimuthal angle. As a result, in the center of a beam, a phase singularity appears. The singularity leads to a characteristic donut-shape beam with a zero intensity on the axis.

Our optical vortex phase plate is fabricated directly on top of an optical fiber. This makes it extremely easy to use. No need for optical alignment or bulky free-space optics. Simply connect the fiber to your laser of choice and the output is a vortex beam!

Advantages of our vortex phase plate:

  • No optical alignment is necessary
  • Stability and reproducibility
  • Ease of integration
  • Small size
Left two images: Vortex Phase Plate on a fiber, Right: Focal spot from a fiber with vortex phase plate. The FWHM of the vortex fiber dark spot is 240 nm.

Vortex phase plate on fiber specification:

*Optical measurements are only available for 405-1100 nm wavelength range

The two main features of the beam, angular momentum and donut shape, result in two types of applications. Angular momentum is used in telecommunications to transmit information or in optical trapping to rotate microparticles. Zero intensity at the axis is used in STED microscopy to achieve subdiffraction imaging.

By combining the vortex phase plate with our Fiber Collimator, we can control the beam divergence of the vortex beam that comes out of the optical fiber. Below you can see the far field from the fiber generating optical vortex with M=1 topological charge. The only difference between the fibers is the beam divergence. Choosing output angle of the beam makes it easy to match the vortex fiber with your optical setup.

Left: Far field output from a fiber with a regular spiral phase plate, Right: Far field from a fiber with a vortex collimator lens

Applications of the optical vortex:

  • STED microscopy
  • Telecommunication
  • Optical trapping

Download vortex phase plate specification

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