Fig. 2.

The interaction cavity a) the transverse electric field distribution of the TE_m,n,q = TE_5,2,q mode (left), with the m=5 radial lines of symmetry shown in white, and the n=2 azimuthal lines showing the radial maxima in black (right). b) The cavity geometry profile and intensity of the electric field along the long axis of the cavity of the first 3 axial modes are shown in blue, red, and green, respectively. The beam (white circle) overlaps with the 1^st radial maximum in the interaction mode to promote optimal interaction (right). c) Mode map showing accessible modes within 1 Tesla of the target TE_5,2 mode.