Improvement of calculation efficiency for locating diffraction spot of phase plate with correlation function fitting extreme method

A coaxial measuring system for a hole using non-diffracting beam;

Generation of short pulse and high power non-diffracting beam by active and passive schemes based on axicon;

Study on property of central spot of non-diffracting beams;

Applying wavelet analysis to non diffracting beam based on triangulation measurement to remove noise signals is proposed in this paper.

The non diffracting beam is used as the measuring beam and a virtual detector is used to expand detector size.

For the non diffracting beam generated by an axicon lens, the central spot diameter and non diffracting distance are fixed.