论文部分内容阅读
对2×2全光纤激光器阵列的部分相干合成进行了实验研究。将四台全光纤激光器阵列分为两组,组内两光纤激光器通过一个对激光波长具有一定反射率的光纤光栅实现腔模互注入相位锁定,而两组激光阵列元之间非相干。四束激光经一个四面直角棱镜反射后尽量接近并实现对称排布。获得两组清晰的干涉条纹,条纹最大可见度分别约为43%和38%。整个激光器阵列在泵浦光总功率为1624W时获得925W高功率部分相干输出。在合成光束占空比为0.54时,合成光束的光束质量BQ值约为1.95。激光器阵列由全光纤元件组成,系统结构紧凑,在长时间的高功率合成实验中,性能稳定,没有观察到光热损伤现象。
Experimental research on the partially coherent synthesis of 2 × 2 all-fiber laser arrays has been carried out. The four all-fiber laser arrays are divided into two groups. The two fiber lasers in the group are phase-locked with each other by a fiber grating with a certain reflectivity to the laser wavelength, and the two laser arrays are non-coherent. The four laser beams are reflected as close as possible by a rectangular prism and arranged symmetrically. Obtained two sets of clear interference fringes, stripe maximum visibility of about 43% and 38%. The entire laser array obtains a 925W high-power partially coherent output when the total pump power is 1624W. The composite beam has a beam quality BQ value of about 1.95 at a composite beam duty cycle of 0.54. The laser array consists of all-optical fiber components. The system has a compact structure. In the long-time high-power synthesis experiment, the performance is stable and no photothermal damage phenomenon is observed.