Switching between single- and dual-wavelength mode-locking in waveguide Nd:YAG laser with graphene saturable absorber

This paper presents single-mode waveguide Nd:YAG laser passively mode-locked with graphene saturable absorber. Fine tuning of intracavity losses provides the possibility not only to adjust the mode-locking stability but also to controllably switch between single- and dual-wavelength operation.