Radially variable reflectivity output coupler of novel design for unstable resonators.
An output coupler with radially variable reflectivity, based on a Fabry-Perot interferometer made of two suitable spherical mirrors, is proposed. Application to a pulsed Nd:YAG laser with an unstable resonator has produced diffraction-limited output beams with energy up to 300 mJ.
De Silvestri
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Laporta
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Magni
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V
Svelto
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