高功率脉冲激光器抗失调谐振腔的研究

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。

Research on High Power Pulse Laser Anti-Misalignment Resonators

To simplify high power laser cavity structure, improving the stability particularly on the high power pulsed lasers, enlarging the basic mode volume, improving the beam quality, using the right-angle inner-outer conic composed reflecting mirror as the totally reflecting mirror and a parallel flat mirror as the output mirror is composed of a new laser resonator. Using high power pulsed CO2 laser, studying the relationship between single pulse output energy of a new laser resonator with misalignment angle of right-angle inner-outer conic composed reflecting mirror, as well as output spot change of new cavity laser when the totally reflecting mirror disorders, comparing with plano-concave stable cavity pulsed CO2 laser. The results of the experiments show that if the totally reflecting mirror misalignment angles of two types of laser are equivalent, the reduce of single pulse output energy of composed cone resonator laser is less 50% of plano-concave resonator lasers. When the totally reflecting mirror misalignment angle of composed cone mirror turns to 6’, the laser output spot shape of the new laser cavity does not change significantly. Anti-misalignment stability of the new laser cavity is far more than a plano-concave stable cavity.