Modes of resonators with mirror reflectivity modulated by absorbing masks.
The modes of a stable laser resonator containing, near one mirror, an absorbing mask with two apertures have been calculated on the basis of scalar diffraction theory and experimentally observed in a pulsed Nd:YAG laser. The mode structure has been investigated as a function of the mask geometry, and an interpretation in terms of supermodes is provided.
De Silvestri
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Magni
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Svelto
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