Analysis of photonic lantern mode control performance fluctuations by gray matrix

ZHAO Xinrui; DONG Yijia; NING Yongqiang; LIN Xingchen; ZHU Hongbo

doi:10.37188/OPE.20233119.2818

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Analysis of photonic lantern mode control performance fluctuations by gray matrix

Modern Applied Optics | 更新时间：2023-10-12

- Analysis of photonic lantern mode control performance fluctuations by gray matrix
- Optics and Precision Engineering Vol. 31, Issue 19, Pages: 2818-2826(2023)
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所，长春 130031
  2.中国科学院大学，北京 100049
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20233119.2818
  CLC：
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ZHAO Xinrui, DONG Yijia, NING Yongqiang, et al. Analysis of photonic lantern mode control performance fluctuations by gray matrix. [J]. Optics and Precision Engineering 31(19):2818-2826(2023)
DOI：

ZHAO Xinrui, DONG Yijia, NING Yongqiang, et al. Analysis of photonic lantern mode control performance fluctuations by gray matrix. [J]. Optics and Precision Engineering 31(19):2818-2826(2023) DOI： 10.37188/OPE.20233119.2818.

摘要

为了分析光子灯笼用于光合束时的模式控制能力波动，建立算法提取光场灰度矩阵，使用数值计算结果替代角功率分布方差来分析光子灯笼模式控制能力随合束功率的波动。根据功率流方程与临近模耦合理论推导了算法的理论基础。从算法结构和灰度值提取精度参数两方面详细介绍灰度提取算法。通过对比复原图与原光场图，证明算法将光强分布情况转化成灰度值矩阵的数值准确性；最后，以自制的3×1光子灯笼在弱主动模式控制下的表现为例，分析其模式控制能力随合束功率变化导致的输出光质量与合束损耗的变化。实验结果解释了合束功率从0增加到270 mW时3×1光子灯笼的光合束损耗曲线斜率变化以及合束光最大高斯拟合度波动。算法能简单、快速地分析光子灯笼用于基模合束光制备时模式控制能力的波动情况，且环境敏感度低，光场功率分布提取准确率大于99%。

Abstract

An algorithm was designed to assess the fluctuation in the mode control ability of the photonic lantern. This algorithm incorporated a module specifically for extracting the gray matrix from the light field image. To analyze the fluctuations in the photonic lantern's mode control along with the beam power， numerical results were used in place of angular power distribution variance. Initially， the theoretical foundation of the algorithm was established using the power flow equation and adjacent mode coupling theory. Following this， the gray extraction algorithm， detailing its structure and parameters were elaborated. By utilizing the gray matrix， a restored image was derived and compared with the original light field image. The findings confirmed that the algorithm effectively translates the light intensity distribution into a gray value matrix. Finally， the mode control changes of a custom 3×1 photonic lantern was evaluated under varying beam-combining power. During the experiment， the beam combining power was increased from 0 to 270 mW. The experimental outcomes indicate that our analysis accounts for the variations in the slope of the light beam combining loss curve for the 3×1 photonic lantern and the fluctuation in the maximum Gaussian fit degree of the combined beam as the power increases. In summary， this algorithm offers a simple and efficient method for assessing the fluctuation in the mode control ability of the photonic lantern when generating the fundamental mode beam. It exhibits low environmental sensitivity， and its accuracy in extracting light field data exceeds 99%.

关键词

半导体激光模式控制灰度矩阵光子灯笼光合束

Keywords

diode lasermode controlgray matrixphotonic lanternbeam combining

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