Walk-off reduction, using an external optical plate and Bessel–Gaussian interaction
Mansouri Masoume, Askarbioki Mohsen, Ghavami Sabouri Saeed†, Khorsandi Alireza‡
       
Variation of ❘ d SHG − d THG❘ for a wide range of angles with respect to the beam direction. The thickness of the proposed optical plates is assumed to be t = 20 mm.