AN ANALYTICAL SOLUTION OF CONFOCAL UNSTABLE OPTICAL RESONATOR
共焦不稳定光学谐振腔的解析解

The Kirchhoff-Fresnel integral equation is transformed into Fourier space and the analytical eigenfunctions, eigenvalus, resonance conditions and far field distributions are obtained. The form of eigenfunctions obtained in the Fourier space are very simple, this result might be used as a convenient start point for further investigation of the unstable optical resonator.