深圳大学电子科学与枝术学院 Optical resonators can usually be divided into either geometrically stable" orgeometrically unstable? categories(where these terms refer to ray stability within the resonators, and have nothing to do with whether or not the laser is or is not stable against laser oscillation深圳大学电子科学与技术学院 • Optical resonators can usually be divided into either “geometrically stable” or “geometrically unstable” categories (where these terms refer to ray stability within the resonators, and have nothing to do with whether or not the laser is or is not stable against laser oscillation)