Abstract
The characteristics of laser oscillators can be modified toward specific requirements by inserting suitable optical elements in the resonator. We show that replacing one of the resonator mirrors by a conically shaped reflector can lead to a significant increase in the volume of the fundamental mode resulting in improved power efficiency. Alternatively, the first azimuth mode, which is important for various applications, such as high-resolution microscopy, can be selected by inverting the reflector head angle.
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