Article

Zero axial irradiance by annular screens with angular variation.

Applied Optics (impact factor: 1.41). 08/1992; 31(22):4600-2. pp.4600-2
Source: PubMed

ABSTRACT For optical alignment, it may be convenient to use a three-dimensional diffraction pattern with zero irradiance along the optical axis. This pattern is created here by using annular screens in the form of a phase daisy, a daisy flower, or a pie, with an even number of slices of an equal central angle and with every other slice with a phase retardation of 180 degrees . We recognize this form of angular variation as a particular solution of a wider set of functions that are able to produce zero axial irradiance.

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Keywords

able
 
angular variation
 
annular screens
 
axial irradiance
 
daisy flower
 
equal central angle
 
irradiance
 
optical alignment
 
optical axis
 
particular solution
 
three-dimensional diffraction pattern