  Whispering gallery mode microlasers are highly sensitive refractive index
sensors widely explored for biophotonic and biomedical applications. Microlaser
excitation and collection of the emitted light typically utilize microscope
objectives at normal incidence, limiting the choice of the oscillation plane of
the modes. Here, we present a platform that enables the excitation of
microlasers from various directions using an optically manipulated micromirror.
The scheme enables precise sensing of the environment surrounding the
microlasers along different well-controlled planes. We further demonstrate the
capability of the platform to perform a time-resolved experiment of dynamic
sensing using a polystyrene probe bead orbiting the microlaser.
