A method of experimentally decomposing a field within an apertured plano-concave resonator cavity into a forward propagating field (plane to concave) and a backward propagating field (concave to plane) is presented. The use of an intra-cavity aperture which is a simple method of laser beam shaping is a means of mode selection as higher-order modes are actively discriminated. This apertured cavity is modelled by two fundamental resonator theories, namely, Fox-Li analysis and Laguerre-Gaussian decomposition where they are used in the determination of the respective beam profiles at a specific plane. These theories traditionally differ from one another for an apertured cavity where the Gaussian beam within the cavity is truncated. A preliminary set-up is characterized for Gaussian propagation in an attempt to verify that the cavity is viable and accurate. A comparison of experimental data with the theories is presented.
|Level (Hons, MSc, <br> PhD, other)?||MSc|
|Consider for a student <br> award (Yes / No)?||Yes|
|Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?||No|