Fig. 2: Theoretical Boyer-Wolf Gaussian modes.

Beam intensity pattern of the first eighteen Boyer-Wolf Gaussian modes of the 2:1 anisotropic laser cavity. The mode order and degree \((n,l)\) are displayed in the bottom right corner of each panel. Modes with the same order \(n={{{{\mathrm{0,1,2}}}}},\ldots\), have the same resonating frequency and Gouy-shift phase. Due to the parabolic nature of the modes, the nodal lines form parabolas. The parity of \(n\) indicates the symmetry of the mode with respect to the \(y\)-axis. Modes with negative \(l\) are a reflection around the \(y\)-axis (\(x\to -x\)) of the positive \(l\)-modes depicted here.