Figure 6

From: The influence of whispering gallery modes on the far field of ring lasers

Figure 6

(a) Measured far field exhibiting a clockwise rotation. (b) Spectrum of this laser with two distinctive peaks. Their separation of roughly 30/cm agrees with our expectations considering the effective refractive index slope within the waveguide and the different locations of the modal COM. (c) Polar map describing the polarization dependent spectral peak heights from (b). The arrows denote the transmitted polarization and the dashed lines the calculated rotation of the symmetry axes. The inset shows the 1st order WGM and the different polarities of the 2nd order WGM, which are responsible for the clockwise rotation in (a).