Open AccessNear-diffraction-limited annular flattop beam shaping with dual phase only liquid crystal spatial light modulators
Author(s) -
Haotong Ma,
Pu Zhang,
Xiaolin Wang,
Yanxing Ma,
Fengjie Xi,
Xiaojun Xu,
Zejin Liu
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.008251
Subject(s) - optics , beam (structure) , laser beam quality , diffraction , materials science , m squared , spatial light modulator , phase (matter) , beam parameter product , beam steering , beam diameter , intensity (physics) , beam expander , laser , laser beams , physics , quantum mechanics
We demonstrate the annular flattop beam shaping technique with dual phase only liquid crystal spatial light modulators (LC-SLM) based on the refractive laser beam shaping systems. One LC-SLM redistributes the intensity distribution, and the other restores the initial underlying wave front. Differing from the conventional annular beam shaping technique, the wave front of the output beam can be maintained. The influences of deviations of beam waist and beam shape on the output beam profile are discussed in detail. Experimental results show that approximate 71% of the power is enclosed in a region with less than 7% rms intensity variation. The 4.1mm diameter near-diffraction-limited beam retains an annular flattop intensity distribution without significant diffraction peaks for a working distance of more than 24cm in the near field.