AUTHOR=Zhu Xiaosi , He Jianlang , Su Yawen , Chen Yan , Hu Xiaopeng TITLE=Theoretical Investigation of Backward Optical Parametric Oscillator Pumped by Vortex Beams JOURNAL=Frontiers in Physics VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.886962 DOI=10.3389/fphy.2022.886962 ISSN=2296-424X ABSTRACT=

Nonlinear generation and manipulation of vortex beams have emerged as a research hot topic in recent years. During nonlinear frequency conversions, orbital angular momentum will transfer from the fundamental wave to harmonic waves. In this work, we study theoretically the backward optical parametric oscillator pumped by vortex beams. The orbital angular momentum conservation law has been disclosed for the counter propagation nonlinear process. In addition, the oscillation threshold and the conversion efficiency have been investigated in detail. Our results will be helpful for the experimental demonstration of backward optical parametric oscillator pumped by vortex beams.