  Magnon Kerr nonlinearity plays crucial roles in the study of cavity
optomagnonics system and may bring many novel physical phenomena and important
applications. In this work, we report the investigation of high- order sideband
generation induced by magnon Kerr nonlinearity in a cavity-magnon system, which
is critically lacking in this emerging research field. We uncover that the
driving field plays a significant role in controlling the generation and
amplification of the higher-order sidebands and the sideband spacing can be
adjusted by regulating the beat frequency between the pump laser and the probe
laser, which is extremely eventful for the spacing modulation of the sideband
spectrum. Based on the recent experimental progress, our results deepen our
cognition into optomagnonics nonlinearity and may find interesting applications
in optical frequency metrology and optical communications.
