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为简化高功率激光器谐振腔结构,提高激光器特别是高功率脉冲激光器的稳定性,增加基模体积,改善光束质量,采用直角内外圆锥面组合反射镜作为全反镜,平行平面镜作为输出镜组成新型激光谐振腔。使用高功率脉冲CO2激光器,研究了新型激光谐振腔的单脉冲输出能量和直角内外圆锥面组合反射镜失调角的关系以及新型腔激光器在全反镜失调时输出光斑的改变,并和平凹稳定腔脉冲CO2激光器进行了比较。实验结果表明,若两种激光器的全反镜失调角相同,组合锥面全反镜谐振腔激光器的单脉冲输出能量降低的程度不到平凹腔激光器的50%。在组合锥面全反镜失调角达到6′时,新型激光谐振腔激光器输出光斑形状没有明显变化。新型激光谐振腔的抗失调稳定性远超过平凹稳定腔。
In order to simplify the structure of high-power laser cavity, improve the stability of laser, especially high-power pulsed laser, increase base size and improve beam quality, use the combination of right and left inner conical mirrors as total reflection mirror and parallel plane mirror as output mirror Laser cavity. Using high power pulsed CO2 laser, the relationship between the single pulse output energy of the new laser cavity and the angle of misalignment of the right and left inner conical mirrors and the change of the output spot of the new cavity laser when the total mirror is out of alignment are studied. Pulsed CO2 lasers were compared. Experimental results show that the single-pulse output power of the combined SLR resonator can not decrease by less than 50% of that of the flat-cavity laser if the angle of total misalignment of the two lasers is the same. When the misalignment angle of the combined cone mirror reaches 6 ’, the shape of the output laser spot of the new laser cavity laser does not change significantly. The new laser resonator anti-offset stability far exceeds the stability of the cavity flat.