Abstract
We present a new idea of marking based on spectral properties of CO 2 laser radiation. The idea has been illustrated on RF excited waveguide CO 2 lasers in different configurations: single channel, multi-waveguide and slab-waveguide ones. The pulse operation of the laser has been considered as well. The advantage of the presented diffraction marker is avoiding complicated and fallible mechanical elements. The only executive elements of the marker are a diffraction grating and a piezoceramic transducer. It has been shown that the slab-waveguide configuration of the RF excited CO 2 laser equipped with an unstable resonator is the most promising configuration for application to the diffraction marker.
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