Walk-off reduction, using an external optical plate and Bessel–Gaussian interaction
Mansouri Masoume, Askarbioki Mohsen, Ghavami Sabouri Saeed†, Khorsandi Alireza‡
       
Two-dimensional intensity profile of the generated Bessel–Gaussian third-harmonic beam, captured by a CCD camera and MaxImDL software. The profile of Gaussian third-harmonic beam shown in Fig.  6 is included for comparison.