@incollection{Omatsu17,
author = {Andrew James Lee and Takashige Omatsu},
title = {Direct Generation of Vortex Laser Beams and Their Non-Linear Wavelength Conversion},
booktitle = {Vortex Dynamics and Optical Vortices},
publisher = {IntechOpen},
address = {Rijeka},
year = {2017},
editor = {Hector Perez-de-Tejada},
chapter = {2},
doi = {10.5772/66425},
url = {https://doi.org/10.5772/66425}
}