Abstract
The intensity distribution of a partially coherent beam with a nonconventional correlation function, named the multi-Gaussian Schell-model (MGSM) beam, focused by an axicon was investigated in detail. Our numerical results showed that an optical needle with a flat-topped spatial profile and long focal depth was formed and that we can modulate the focal shift and focal depth of the optical needle by varying the width of the degree of coherence (DOC) and the parameters of the correlation function. The adjustable optical needle can be applied for electron acceleration, particle trapping, fiber coupling and percussion drilling.
Highlights
Over the past years, axicon lenses have been studied widely due to their unique properties of producing focal lines of narrow transverse width over extended distances [1,2]
What is interested in beams with a flat-topped spatial profile, which have shown great value in lithography, the effect of the nonconventional correlation function on the intensity distribution of beams focused by integrated circuit trimming, laser welding, and biomedical engineering
We will investigate the beam were proposed, which can produce prescribed flat-topped spatial profiles. For these intensity distribution of a multi-Gaussian Schell-model (MGSM) beam focused by an axicon and explore the effect of a nonconventional coherent beams, parameters of a of correlation nonconventional partially correlation function on theextra focusing properties a MGSM function beam. can be used to control the flat-topped spatial profiles
Summary
Axicon lenses have been studied widely due to their unique properties of producing focal lines of narrow transverse width over extended distances [1,2]. What nonconventional partially coherent light, the correlation function of which does not satisfy a Gaussian is the effect of the nonconventional correlation function on the intensity distribution of beams focused distribution, beenAmong proposed [18,19].of It has been confirmed both theoretically and experimentally by an axiconhas lens?. What is interested in beams with a flat-topped spatial profile, which have shown great value in lithography, the effect of the nonconventional correlation function on the intensity distribution of beams focused by integrated circuit trimming, laser welding, and biomedical engineering. We will investigate the beam were proposed, which can produce prescribed flat-topped spatial profiles [34,35] For these intensity distribution of a MGSM beam focused by an axicon and explore the effect of a nonconventional coherent beams, parameters of a of correlation nonconventional partially correlation function on theextra focusing properties a MGSM function beam. We will investigate the intensity distribution of a beam focused by an and Beam explore the effect nonconventional correlation function on
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