Second harmonic generation of off axial vortex beam in the case of walk-off effect

Process of off axial vortex beam propagating in negative uniaxial crystal is investigated in this work. Firstly, we get the formulae of the normalized electric field and calculate the location of vortices for second harmonic beam in two type of phase matching. Then, numerical analysis verifies that...

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Bibliographic Details
Published in:Optics communications 2016-07, Vol.370, p.267-275
Main Authors: Chen, Shunyi, Ding, Panfeng, Pu, Jixiong
Format: Article
Language:English
Subjects:
Beams (radiation)
Electron beams
Fluid flow
Mathematical analysis
Off axial vortex beam
Phase matching
Second harmonic generation
Separation
Vortices
Walk-off effect
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Summary:Process of off axial vortex beam propagating in negative uniaxial crystal is investigated in this work. Firstly, we get the formulae of the normalized electric field and calculate the location of vortices for second harmonic beam in two type of phase matching. Then, numerical analysis verifies that the intensity distribution and location of vortices of the first order original vortex beam depend on the walk-off angle and off axial magnitude. It is shown that, in type I phase matching, the distribution of vortices is symmetrical about the horizontal axis, the separation distance increases as the off axial magnitude increases or the off axial magnitude deceases. However, in type II phase matching, the vortices are symmetrical along with some vertical axis, and increase of the walk-off angle or off axial magnitude leads to larger separation distance. Finally, the case of high order original off axial vortex beam is also investigated.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2016.03.027