Circular ring Dammar grating
A Damman grating and annular technology, applied in the field of annular Damman grating and its manufacture, can solve the problems such as annular intensity distribution that cannot provide multi-level spectrum equal intensity
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[0028] figure 1 It is a schematic diagram of a Damman grating structure with three rings, one of the embodiments of the circular Damman grating of the present invention. The radius of each inner ring is represented by a, b, the phase of each ring is represented by φ1, φ2, and φ3, and the radius of the outer ring is Normalized to 1. It can be seen from the figure that the annular Damman grating of the present invention is a phase plate formed on a transparent medium with phase distribution of multiple concentric rings, and the phase values in the same ring are the same. If the phase between all adjacent rings has only two values, it is called a binary phase ring-ring Damman grating. If the phase between the various rings is multi-valued, it is called a multi-valued phase ring-shaped Damman grating.
[0029] Among the ring-shaped Damman gratings, the most commonly used and easy-to-process is the ring-shaped binary phase-only mask. The so-called ring zone means that the phas...
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Abstract
Description
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