| Tunable TEA CO2 lasers have wide applications in many fields. In this thesis, the automatic adjustment technology and resonator stability technology of grating tunable TEA CO2 laser are studied, including resonator technology, laser detection, digital image processing and computer controlling.After investigating the theories and achievements on automatic resonator adjustment technology, a laser sampling system utilizing an uncooled focal plane infrared imagery as the detector is built for large-energy grating tunable TEA CO2 resonator adjustment. Based on this system, the criterion for selection of spot qualities is proposed, and the image processing software of spots selection is also developed to process a group of spot images captured by the imagery and select the best one according to the criterion. The result is fed back and the automatic adjustment of grating tunable TEA CO2 laser is realized. In order to investigate the resonator stability of large-energy grating tunable TEA CO2 laser, its output energy stability, beam pointing stability and far-field divergence angle stability are measured respectively and the factors affecting the stability are analyzed.The automatic adjustment technology of resonator is an important part of laser technology. In this work, a novel resonator adjustment method is presented and the automation of grating tunable TEA CO2 laser resonator adjustment is realized. This technology will obtain practical application with the development of digital image processing technology and the improvement of laser detection. |
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