Fig. 2. EEGS measurements in WGM resonators with Q ~ 100–300.
a Measured series of EELS gain spectra as a function of light wavelength (vertical axis), showing two distinct resonances at 586.27 nm (2.1148 eV) and 601.02 nm (2.0629 eV) with quality factors of 244 and 194, respectively. b Cascade of one in every four spectra taken from (a), where both the stimulated loss and gain sidebands are observable. c EEGS, EELS, and CL measured spectra (solid curves) compared to theory (dashed curves) for the same e-beam probe position (blue circle at Re in the inset) and mirror focal position.