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Transverse mode locking of different frequency-degenerate families based on annular beam pumping

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Abstract

Optical vortex arrays have been achieved in an end-pumped ${\rm Nd}{:}{\rm YVO}_4$ laser pumped by an annular beam. Spontaneous transverse mode locking of Laguerre–Gaussian modes in different frequency-degenerate families has been obtained by merely adjusting the pump power. A maximum output power of 0.88 W and optical conversion efficiency of 13.6% are achieved for optical vortex arrays. Optical vortex arrays formed in different frequency-degenerate families of Laguerre–Gaussian modes can be actively controlled by the position of the axicon. This work provides a way to research transverse mode locking of Laguerre–Gaussian modes in different frequency-degenerate families based on annular beam pumping.

© 2021 Optical Society of America

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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