A spiral phase plate, in literature also referred to as a vortex lens, finds application in many cutting edge scientific and technological developments such as stimulated emission depletion (STED) microscopy, optical vortex chronographs, nano-lithography, ranging as well as optical trapping. In addition, vortex lenses play a considerable role in modern data transfer and data cryptography.
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Phase plates with a linearly shaped phase steps are commonly used as mode convertres and allow to transform Hermite–Gaussian Modes from TEM00 to higher modes TEM01, TEM11 etc. Such transoframtions are applied for example in the field of optical cavities and resonators.
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