激光与光电子学进展, 2015, 52 (4): 041401, 网络出版: 2015-02-15   

基于微透镜阵列的高效率光纤耦合系统设计 下载: 1338次

Design of High Efficiency Fiber Coupling System Based on Microlens Array
作者单位
中北大学仪器科学与动态测试教育部重点实验室, 山西 太原 030051
摘要
光纤耦合是半导体激光器集成光源进一步改善输出光束质量和远距离传输的重要手段。然而,由于半导体激光器单管体积和散热的限制,合成后激光光源的输出光束光参量积仍较大,不利于与单根多模光纤的耦合;直接与光纤束耦合又受到光纤束填充比的限制。针对多个半导体激光器单管集成的光源,采用倒置前端光学放大系统,对合成光束直径进行压缩;并采用六方排列的微透镜阵列作为耦合元件,使其光瞳成像在光纤端面,从而实现微透镜与光纤的一对一耦合,得到理论无损耗的高效光纤耦合系统。为了改善光场边缘像差影响,采用空心光管进一步匀化光场分布,且减小了边缘光线的发散角,提高了边缘光线的成像质量,优化后的系统耦合效率达98%。这一系统利用微透镜阵列将光束分束、成像,克服了集成光源输出光束光参量积较大不易与单根光纤耦合的缺点;通过使微透镜的入瞳成像在光纤端面,且光纤束的排列与微透镜阵列排列相同,提高了光束与光纤束的耦合效率。
Abstract
The fiber coupling is an important method of semiconductor laser integration for improving light beam quality and remote communication. But due to the limits of semiconductor laser volume and thermal dissipation, the output light after integration of laser has still larger beam parameter product (BPP), which is not easy to couple with a single multimode fiber. The packing ratio of fiber bundle is another factor to limit direct couple with fiber bundle. In order to get high efficiency couple integration light source of multi semiconductor laser into fiber bundle, optical amplify system is adopted to compress the beam diameter. Microlens array is used as coupling element, which makes the pupil of lenslet image on the end of fibers. One- to- one coupling is achieved and a fiber coupling system with no loss in theory is come ture. To improve aberration effect due to rim ray, hollow light pipe is employed to further homogenize light field. Furthermore, divergence angle of rim ray is reduced and its imaging quality is improved. The coupling efficiency of optimized system can be up to 98%. The system utilizes microlens array for beam splitting and imaging, which overcome the shortages of larger BPP and not easy to couple with single fiber. The system makes the pupil of microlens to image at the end of fibers and gets the same arrange spots image with that of the fiber bundle, thus, coupling efficiency of both light beam and fibers are improved.

王艳红, 王海伟, 王高. 基于微透镜阵列的高效率光纤耦合系统设计[J]. 激光与光电子学进展, 2015, 52(4): 041401. Wang Yanhong, Wang Haiwei, Wang Gao. Design of High Efficiency Fiber Coupling System Based on Microlens Array[J]. Laser & Optoelectronics Progress, 2015, 52(4): 041401.

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