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15 May 2002 Point spread functions with extended depth of focus
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Abstract
The use of an annular pupil plane filter may be used to increase the depth of focus of an objective lens without significant deterioration of the lateral resolution. However this approach is very inefficient since most of the illumination light is blocked by the annular filter. We describe a method which uses a diffractive optical element to increase significantly the depth of focus but with dramatically increased light efficiency.
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Tony Wilson, Mark A. A. Neil, and F. Massoumian "Point spread functions with extended depth of focus", Proc. SPIE 4621, Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing IX, (15 May 2002); https://doi.org/10.1117/12.467842
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