Abstract
Losses and near and far field intensity distributions of unstable resonators with equivalent Fresnel numbers in the range up to three have been investigated both experimentally and theoretically. The losses were determined absolutely using a new method for loss measurement. Intensity distributions of lowest loss modes were recorded by means of an image-processing system and compared to numerical solutions of Kirchhoff ’s integral equation of the empty cavity. The experiments were performed with a pulsed Nd-YAG system.
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