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The use and role of phase plate optics in laser optics
Release Time:
2023-03-24
Phase plate optics offer a variety of uses including phase contrast microscopy, ring beam generation and more. Many uses can be achieved by creating the well known phase difference in the region of the phase plate.
Phase plates are a common name for many types of optical elements designed to provide a pre-designed phase profile for the wavefront. This phase can be used for a variety of optical shaping applications. In this article we will describe in detail how phase plate optics work and some of the possible applications of phase plates in laser optics.
Principle of operation
The wave front passing through the transmitting material has a lower velocity than the wave front passing through the air. This means that by creating an optical window (plate) with variable thickness, the wavefront in thicker regions can be delayed by a pre-designed amount relative to thinner regions, and any desired profile can be achieved by defining the boundaries of the region. For a given phase distribution, the image received in the far field will be given by the Fourier transform of that phase and the input amplitude. This means that almost any image can be generated.
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