Improve Multi-electrode Tea-co <sub> 2 </ Sub> Laser Output Stability

The newly developed multi-electrode pairs TEA-CO₂ laser is cutting-edge and original, with an adjustable multi-optical pulse and time-impulse interval from 0～15μs.The laser don't need a cyclic system of gas. Apart from that, it has a simple structure and a wide range of applications. The paper is focused on the three aspects: the basic structure and working principles; the analysis of its instability in practical use; a research on the problems with its output instability.The paper carried a in-depth research on the influences of the negative ion, the discharge of arc, gas impurity and the makeup of gas respectively on the output stability of the laser. With theoretical analysis and experimental discovery, I found that: the discharge of arc, which is subject to a lot of reasons, is probably the main reason for the output instability of the laser.With a careful analysis of the reasons responsible for the gas impurity and the negative ion, this article gives the gas diffuse equation and its initialized distribution of the densities, calculates this equation with MATLAB. The result confirms the optimal space between electrode pairs and the optimal time of pulse discharging, and the result matches case with experiment.The final part of the paper we analyzed the stability of the mode of the output optical pulse, as well as the mode's selection the design of complex cavity for realizing single mode. Besides, the paper did an evaluation of the quality of the output laser beam using factor M² .In the process of the evaluation we got the mathematical relation between correlative parameter β, Interceptive parameter δ, and the factor M², using coherent beam passing diaphragm, with a numerical calculation and diagram by MATLAB.