Extended Data Fig. 1: Optical set-up and spectral characterization of the microlaser.
From: Spin–orbit microlaser emitting in a four-dimensional Hilbert space

a, Optical set-up for the characterization of the microlaser. b, Lasing spectrum of the microlaser under a pumping intensity of 25 kW/cm2 which shows a robust single mode lasing. c, Light–light curve of the microlaser.