Mechanism of sudden-change of
output power of TF CO2 laser  

Chen Peifeng, Qiu Junlin, Gong Zhiwei Tang Zhonghua, Chen Yihong, Chen Tao
Laser Institute Huazhong University of Science and Technology Wuhan, China  

According to the experimental results and theoretical analysis, it is found that there are two operation points in the gas of non-excited areas. This phenomenon is inherent in the transverse flow CO2 lasers, and is related to the gas absorption in the non-absorption areas in the two ends of resonant cavity. When the output power exceeds a threshold value, the operation point skips. This skip results in a sudden-change in the output power of the CO2 laser. A reasonable theoretical explanation is given here for the phenomenon, and the theoretical value of the threshold (above 8.9 kW) obtained from our theory is agreement with the experimental one (above 9.5 kW).
  Reprinted from Chinese Journal of Lasers, Vol. 21, No. 10 (1994), 785-788

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