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A FTIR-shutter based on the principle of frustrated total internal reflection was studied as an active Q-switch for 3 μm lasers. The FTIR-shutter used consists of two truncated YAG crystal prisms with a small air gap between them. The gap width is modulated by two piezoelectrical cells attached on the truncated facets of the prisms. The switching time and the spatial transmission profile of the shutter...
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