Coherent beam combination of fiber lasers with a strongly confined tapered self-imaging waveguide:theoretical modeling and simulation
作者机构：College of Optoelectric Science and EngineeringNational University of Defense TechnologyChangshaHunan 410073China
出 版 物：《Photonics Research》 (光子学研究（英文版）)
年 卷 期：2013年第1卷第4期
页 面：186-196页
核心收录：
学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程]
摘 要：Coherent beam combination(CBC)of fiber lasers based on self-imaging properties of a strongly confined tapered waveguide(SCTW)is studied *** formulas are derived for the positions,amplitudes,and phases of the N self-images at the output of a SCTW,which are important for quantitative analysis of waveguidebased *** formulas are verified with numerical examples by a finite difference beam propagation method(FDBPM)and the errors of the analytical expressions are *** study shows that the analytical formulas agree well with the FDBPM simulation results when the taper angle is less than 1.4°and the phase distortion is less thanλ∕*** relative errors increase as the taper angle *** on the theoretical model and the FDBPM,we simulated the CBC of fiber laser array and compared the CBC based on the tapered waveguide with that based on the nontapered *** effects of input beam number,aperture fill factor,and taper angle on the combination performance have been *** study reveals that a beam which has near-diffraction limited beam quality(M2≤1.41)and a single beam without side lobe in the far field can be achieved with tapered-waveguide-based *** is shown that beam quality depends on input beam number,aperture fill factor,and taper *** exists a best fill factor which will increase as input beam number *** tolerance of the system on the fill factor and the taper angle is studied,which is 0.45t0.67 andθ0.8°,*** results may be useful for practical,high-power fiber laser systems.
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