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离轴正支共焦非稳腔被广泛的用于固体板条激光器和中小功率封离型板条CO2气体激光器中。针对正支共焦非稳腔输出镜失调时易出现功率严重下降的现象,通过数值研究不同有效菲涅耳数的正支腔在平移失调的情况下,过量噪声因子随着失调程度的变化规律,分析了导致这一现象的原因。数值结论显示,当有效菲涅尔数选在[s-0.20~s+0.20](s为整数)范围内,泵浦激励效率较低,且在微小失调时,易造成激光功率的严重下降选取;在[s+0.65~s+0.75]范围内,最有利于激光的输出功率稳定性和激励效率;在这种情况下,微小的下移失调,可能更有利于输出功率的小幅度提升。
Off-axis positive-branch confocal unstable chamber is widely used in solid slab lasers and small and medium-power confined slab CO2 gas lasers. Aiming at the phenomenon of serious power decline when the misalignment of output mirror of positive branch and non-steady state is unbalanced, the positive branch of different effective Fresnel numbers in the case of translational misalignment is numerically studied. The variation of excessive noise factor with the degree of disorder , Analyzed the causes of this phenomenon. The numerical results show that the pump excitation efficiency is low when the effective Fresnel number is selected in the range of [s-0.20 ~ s + 0.20] (s is an integer), and it is easy to cause the serious decrease of the laser power in the case of slight misalignment ; In the range of [s + 0.65 ~ s + 0.75], the output power stability and excitation efficiency are most favorable to the laser; in this case, the slight down-going offset may be more conducive to the small increase of the output power.