Study on the influence of phase noise on coherent beam combined Bessel-Gaussian beam
Study on the influence of phase noise on coherent beam combined Bessel-Gaussian beam
复制标题
相位噪声对相干光束组合贝塞尔-高斯光束的影响研究
DOI：
10.1016/j.optcom.2018.11.066
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发表时间：
2019
影响因子：
2.4
通讯作者：
Chu Xiuxiang
中科院分区：
文献类型：
--
作者：
Yu Tao;Xia Hui;Fan Zhihua;Xie Wenke;Zhang Pan;Liu Junsheng;Chen Xin;Chu Xiuxiang
相干光束合成(CBC)技术是获得高功率激光光束的有效方法之一，但子光束间的随机位相噪声严重影响了合成光束的质量。提出了一种基于CBC技术的组合贝塞尔-高斯(CBG)光束的产生方法。采用相关系数来评价相位噪声对CBG光束的影响，包括高斯相位噪声(GPN)和被测光纤激光相位噪声(FLPN)。研究结果表明，当相位噪声幅度小于λ/5时，n阶CBG光束的螺旋相位不受噪声的影响。测量了光纤激光器的相位噪声，其幅度约为λ/10。因此，测量的光纤陀螺光束的螺旋相位不受测量相位噪声的影响。此外，通过增加子束数目，有效地提高了CBG光束的抗相位噪声能力。
Coherent beam combining (CBC) technology is one of the effective methods to obtain the high power laser beam, but the quality of the combined beam is significantly affected by the random phase noise among the sub-beams. In this work, a method for generating a combined Bessel–Gaussian (CBG) beam based on CBC technology is proposed. The correlation coefficient is adopted to evaluate the influence of phase noise on CBG beam including the Gaussian phase noise (GPN) and measured fiber laser phase noise (FLPN). The research results of GPN show that the spiral phase of the n-order CBG beam is unaffected by noise when the amplitude of phase noise is less than λ/5. The phase noise of fiber laser is measured, and its amplitude is around λ/10. Therefore, the spiral phase of the CBG beam is unaffected by the measured FLPN. Moreover, the resisted ability of the CBG beam against phase noise is improved efficiently through increasing the number of sub-beams.