【作者】 李宏棋；

【导师】 程祖海；

【作者基本信息】 华中科技大学 ， 物理电子学， 2007， 博士

【摘要】 高能激光的产生﹑传输和应用是现代激光技术和光学工程的重要发展方向。高能激光器设计中的主要问题是,如何在高热负载下保持光学谐振腔的稳定;如何获得尽可能大的模体积和好的横模鉴别能力,以实现高功率单模运转,从而既能从激活物质中高效率地提取能量,又能保持高的光束质量。本论文讨论了高能激光的主要特性,分析了角隅反射镜和直角内圆锥面反射镜的光学特性以及制造误差对反射镜光学性质的影响,设计了用于高能激光器的角隅反射镜和直角内圆锥面反射镜,提出了采用角隅反射镜和直角内圆锥面反射镜作为全反镜,平行平面镜作为输出镜组成的两种新型激光谐振腔,并从理论和实验两方面研究了角隅全反镜谐振腔和直角内圆锥面全反镜谐振腔的输出特性。主要研究结果有:(1)角隅腔和直角内圆锥腔输出能量大。两种谐振腔激光器的单脉冲输出能量与放电电压均呈线性关系,在放电电压28kv时,角隅腔和直角内圆锥腔单脉冲输出能量分别为14.6J和25.5J,和相同条件下的平凹腔输出相当。(2)角隅腔和直角内圆锥腔抗失调能力强。在角隅全反镜失调角为53.4角分时,角隅腔激光器的单脉冲输出能量下降9.2%,在直角内圆锥面全反镜失调角为46.8角分时,直角内圆锥腔激光器的单脉冲输出能量下降24%;全反镜失调时两种谐振腔的近场输出光斑均没有明显变化。(3)角隅腔和直角内圆锥腔光束指向稳定性高。在输出镜正前方近3m处用热敏纸测量,当角隅全反镜和直角内圆锥全反镜分别偏转56.4角分和18角分时,激光器输出光斑均与不失调时的输出光斑重合。(4)角隅腔和直角内圆锥腔激光器近场光强分布均匀。角隅全反镜谐振腔和直角内圆锥面全反镜谐振腔结构简单,抗失调能力强,指向稳定性高,可以达到改善高能激光器光束质量的目的,特别适用于对光束稳定性有特殊要求的应用领域。更多还原

【Abstract】 Making and propagation and application of high-energy laser are an important direction of modern laser technology and optics engineering. The primary problem in the design of the high energy laser are, how to keep the stabilization of the optical resonators in the high heat load; how to make the model volume as large as possible and distinguish the transverse models as good as possible, so as to realize the single model operation, distill the energy from the activation matter effectively, keep the beam quality excellent.The dissertation discusses the main characteristics and the controlling methods of the beam quality of the high energy lasers, analyses the optical characteristics of the corner cube mirror and the right angle cone mirror and the influence of the fabricating errors on the optical characteristics of the mirrors, devises the corner cube mirror and the right angle cone mirror applying to the high energy lasers, puts the corner cube mirror and the right angle cone mirror forward as the totally reflecting mirror respectively and the plane parallel mirror as the output mirror forming two new laser resonators, researches the output characteristics of the corner cube mirror cavity and the right angle cone mirror cavity in the theory and experiment aspect.The main research results are as follows.(1)The corner cube mirror cavity and the right angle cone cavity have the large laser energy output. It is linear relation between the gas discharge voltage and the single-pulse output energy both of the two laser cavity, when the voltage is 28kv the single-pulse output energy of the corner-cube cavity and the right angle cone cavity are 14.6J and 25.5J respectively, the same as the output of the plane concave cavity in the same condition.(2)The corner cube mirror cavity and the right angle cone mirror cavity have the great advantages in the anti-misalignment stability. When the misalignment angle of the corner cube mirror is 53.4 minutes, the single-pulse output energy of the corner cube cavity decrease 9.2%, when the misalignment angle of the right angle cone mirror is 46.8 minutes, the single-pulse output energy of the right angle cone mirror cavity decrease 24%, the near-field laser spot figures have little change when both totally reflecting mirrors are misaligned.(3)The corner cube mirror cavity and the right angle cone mirror cavity have the great advantages in the beam directional stability. When the measuring place stands about 3m in front of the output mirrors and the misalignment angles of the corner cube mirror and the right angle cone mirror are 56.4 minutes and 18 minutes respectively, the output laser spots are coincident with the alignment laser spots.(4)The near-field beam intensity distribution of the plane-cone mirror cavity laser and the plane-corner cube mirror cavity laser are near to the plane wave.The corner cube mirror cavity lasers and the right-angle-cone mirror cavity lasers have the great advantages in the anti-misalignment stability and the beam directional stability. With the simple structure, they are easy to install and adjust, will improve the beam quality, especially apply to the high power laser system requiring beam stability.更多还原