Figure 4

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

Figure 4

(a) Measured far field of a continuous π-shift laser with a counter clockwise rotation of the far field pattern. The inset shows the far field of an abrupt π-shift laser, which was used for alignment. (b) Single-mode spectrum of the continuous π-shift laser with a side mode suppression ratio of more than 23 dB. (c) Calculated far field.