无输出镜外腔光谱合束结构对反馈效率的影响  

Influence of output mirror free external cavity spectral beam combining structure on feedback efficiency

作　　者：金装 李景 姜梦华[1,2,3] 刘友强[1,2,3] 秦文斌[1,2,3] 曹银花[1,2,3] 王智勇[1,2,3] Jin Zhuang;Li Jing;Jiang Menghua;Liu Youqiang;Qin Wenbin;Cao Yinhua;Wang Zhiyong(Beijing Engineering Research Center of Laser Technology,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Trans-scale Laser Manufacturing Technology,Ministry of Education,Beijing University of Technology,Beijing 100124,China;Institute of Laser Engineering,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Beijing Aeronautical Technology Research Center,Beijing 100076,China)

机构地区：[1]北京工业大学材料与制造学部北京市激光应用技术工程技术研究中心,北京100124 [2]北京工业大学跨尺度激光成型制造技术教育部重点实验室,北京100124 [3]北京工业大学材料与制造学部激光工程研究院,北京100124 [4]北京航空工程技术研究中心,北京100076

出　　处：《红外与激光工程》2023年第3期140-149,共10页Infrared and Laser Engineering

基　　金：北京市自然科学基金(4174085)。

摘　　要：半导体激光阵列无输出耦合镜外腔光谱合束技术利用光栅的0级和1级衍射光束反馈实现发光单元的波长锁定,避免了0级和1级衍射光束的转储和浪费,可以获得高的合束效率。因此,0级和1级衍射光束的反馈量高低就会决定外腔波长锁定的稳定性,进而影响合束后光束质量的高低甚至光谱合束的成败。针对此种结构,理论研究了两外腔长度、望远镜滤波结构及"Smile"效应对0级和1级衍射光束反馈效率的影响,结果表明:(1)外腔长度会影响反馈功率以及串扰程度;(2)望远镜滤波结构可以有效滤除大偏角杂散光束以及使光束正确反馈回原发光单元;(3)"Smile"效应的程度对反馈效率以及输出光束质量影响尤为严重,需要采取措施进行抑制。Objective The external cavity spectral beam combining technology has two structures of open loop(without output coupler)and closed loop(with output coupler).The main difference between them is that the wavelength locked feedback beam of each light-emitting unit is different.Among them,the output coupler free external cavity spectral beam combining structure uses the beam returning from re-diffraction along the 0th-order and 1st-order diffraction direction as the feedback light,which avoids the waste of the beam and overcomes many problems of the feedback locking of the−1st order diffraction beam,and realizes the high-efficiency wavelength beam combination.For spectral beam combining technology,the feedback efficiency of the external cavity determines the stability of wavelength locking and even the success or failure of beam combination.Compared with the general closed-loop structure,the output coupler free external cavity spectral beam combining structure can only obtain enough feedback beams to achieve wavelength locking by controlling the parameters of the external cavity,and this external cavity structure is relatively complex,and the feedback efficiency variation caused by some factors in the external cavity are more obvious than the closed-loop structure.Therefore,for this structure,a simulation system is established to study the influencing factors of the external cavity feedback efficiency.Methods The efficiency model of output coupler free external cavity spectral beam combining structure is constructed,and the expression of spectral beam combining efficiency is deduced.According to the expression,the length of the external cavity,the telescope filtering system and the"Smile"effect have great influence on the feedback efficiency of this structure.The output coupler free external cavity spectral beam combining structure in Zemax is established,and the level of the feedback quantity of the two diffraction cavities in this system and the change in feedback quantity caused by changing the cavity length,the

关 键 词：半导体激光阵列 无输出耦合镜外腔光谱合束 "Smile"效应 反馈效率 

分 类 号：TN248.4[电子电信—物理电子学]