不同结构非稳腔光束特性研究

非稳腔由于其良好的模式鉴别特性,且可获得接近衍射极限的输出束,因此在板条激光器及放大器中广泛应用。但非稳腔有多种不同结构,不同类型谐振腔的输出光束特性各不相同,因此对不同结构非稳腔特进行研究具有重大意义。采用Fox-Li迭代算法,数值模拟了对称正支和负支共焦腔,对称非稳腔和离轴非稳腔的输出特性,对不同结构谐振腔的稳定性进行了分析。研究结果表明,离轴非稳共焦腔输出光束远场分布能量更集中,且输出光束的M2因子仅为对称腔的1/5; 而离轴负支共焦腔的抗失调特性优于离轴正支腔。

Abstract

The unstable resonator is widely used in the slab lasers and amplifiers due to its good mode discrimination characteristics and the ability to obtain output beam close to the diffraction limit. However, there are many different structures of unstable resonators, and the output beam characteristics of different types of resonators are different. Therefore, it is of great significance to study the unstable resonator of different structures. The Fox-Li iterative algorithm was used to numerically simulate the output characteristics of symmetric positive and negative branch confocal resonators, symmetric unstable resonator and off-axis unstable resonator, and the stability of different structure resonators were analyzed. The results show that the far field energy distribution of the output beam of the off-axis unstable confocal resonator is more concentrated, and the M2 factor of the output beam is only 1/5 of the symmetric resonator, while the anti-misalignment of the off-axis negative branch confocal resonator is better than the off-axis positive branch resonator.

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王炜, 万文, 唐霞辉. 不同结构非稳腔光束特性研究[J]. 应用激光, 2018, 38(6): 1014. Wang Wei, Wan Wen, Tang Xiahui. Beam Characteristics of Unstable Resonator with Different Structures[J]. APPLIED LASER, 2018, 38(6): 1014.

不同结构非稳腔光束特性研究

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