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1.中国科学技术大学 环境科学与光电技术学院,安徽 合肥 230026
2.中国科学院合肥物质科学研究院安徽光学精密机械研究所 中国科学院大气光学重点实验室,安徽 合肥 230031
3.先进激光技术安徽省实验室,安徽 合肥 230037
Received:12 January 2022,
Revised:21 February 2022,
Published:25 June 2022
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罗杰,秦来安,侯再红等.应用于光束质量测量的阵列光纤串扰校正[J].光学精密工程,2022,30(12):1418-1428.
LUO Jie,QIN Laian,HOU Zaihong,et al.Crosstalk correction of array fibers applied to beam quality measurement[J].Optics and Precision Engineering,2022,30(12):1418-1428.
罗杰,秦来安,侯再红等.应用于光束质量测量的阵列光纤串扰校正[J].光学精密工程,2022,30(12):1418-1428. DOI: 10.37188/OPE.20223012.1418.
LUO Jie,QIN Laian,HOU Zaihong,et al.Crosstalk correction of array fibers applied to beam quality measurement[J].Optics and Precision Engineering,2022,30(12):1418-1428. DOI: 10.37188/OPE.20223012.1418.
为降低光束质量测量系统中阵列光纤输出串扰导致的测量误差,本文提出了硬件设计与算法构建相结合的串扰校正方法,并就此展开了相关的原理研究与方法验证。首先,基于光束质量测量要求和光纤传光原理分析了阵列光纤的串扰影响;其次,结合朗伯散射原理和实验结果验证了校正串扰的原理:使用朗伯体降低阵列光纤输出光发散角差异,并建立统一的弥散光斑串扰模型,再采用反卷积算法复原到靶光斑;再次,介绍了针对性的反卷积算法原理,并就相关参数的设计展开了讨论;最后,对真实光斑、光纤输出的未校正光斑及已校正光斑进行对比分析,实验验证了校正方法的可行性。实验结果表明:与未校正光斑相比,校正后光斑强度分布的相对均方根误差由36.06%降至4.67%,桶中功率的相对均方根误差由7.79%降低至0.73%,86.5%桶中功率所在束宽的测量相对误差由10.83%降至3.46%,结合校正算法的图像处理和参数计算总时间约为8 s。
To reduce the error in a beam quality measurement system, which is caused by the output crosstalk of array fibers, a correction method combining hardware design and algorithm construction is proposed, and related principal research and method verification are conducted. First, the crosstalk effect of the array fibers is analyzed based on beam quality measurement requirements and the fiber transmission principle. Second, the principle of crosstalk correction is verified by combining the Lambertian scattering principle and experimental results: the Lambertian scattering principle is used to reduce the divergence angle difference of the output light of fibers, establishing a unified diffuse model to correct spot crosstalk, and the deconvolution algorithm is then used to restore the target spot. Third, the principle of a targeted deconvolution algorithm is introduced, and the design of the relevant algorithm parameters is discussed. Finally, a comparison and analysis of the real spot, the uncorrected spot, and the corrected spot output produced by the fiber are conducted, and the experiment is found to verify the feasibility and effectiveness of the correction method. The experimental results reveal that compared to the uncorrected spot, the relative root mean square error of the intensity distribution of the corrected spot is reduced from 36.06% to 4.67%, and the relative root mean square error of the power in the bucket is reduced from 7.79% to 0.73%. The relative error of the beam width where the power in the bucket is 86.5% is reduced from 10.83% to 3.46%. The total time of image processing and parameter calculation using correction algorithm is about 8 s.
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