This paper described the method, in which fundamental transverse mode was selected by a small hole in an antiresonant ring of laser. By using the method,output energy of laser was increased by 100%, quality of farther and near field of optical beam and stability of laser systm have been improved. Output energy character of colliding mode--locked Nd: YAG laser was studied on theory and experiment. It will be directing significance to selected mode of lasers.
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