光电工程, 2018, 45 (4): 170691, 网络出版: 2018-05-29   

基于光纤耦合的光纤激光阵列像差探测

Wavefront sensing based on fiber coupling of the fiber laser array
李枫 1,2耿超 1,2黄冠 1,2,3杨燕 1,2,3李新阳 1,2
作者单位
1 中国科学院自适应光学重点实验室,四川 成都 610209
2 中国科学院光电技术研究所,四川 成都 610209
3 中国科学院大学,北京 100049
摘要
提出了一种基于光纤耦合的光纤激光阵列像差探测方法,介绍了其结构和波前复原过程,采用数值仿真模拟其复原湍流像差的过程,并进行了7单元自适应光纤准直器(AFOC)阵列复原静态像差的实验。仿真结果表明,本文提出的波前传感方法能够有效复原出湍流畸变波前,且对于不同单元数的六边形排布阵列,存在不同的最优复原阶数。阵列填充因子的降低会增大复原残差,填充因子大于0.8可保证复原残差RMS相较于填充因子为1时的增幅不超过10%。实验结果表明,利用填充因子为0.875 的7 单元AFOC 阵列,复原以离焦为主的低阶像差时,初始畸变波前RMS 为0.433 μm,复原残差小于0.075 μm。仿真和实验结果验证了本文提出的基于光纤耦合的光纤激光阵列像差探测方法的有效性。该技术有望在激光阵列大气传输及湍流校正等系统中得到进一步应用。
Abstract
A new method of wavefront sensing based on fiber coupling in the fiber laser array has been proposed. The scheme and the recovery process of this sensor are introduced. Numerical simulations of detecting the turbulence- induced aberrations utilizing such method and experiments of recovering static aberrations with 7-element adaptive fiber optics collimator (AFOC) array are presented. Numerical results show that such sensor could effectively recover the wavefront with turbulence-induced aberrations. For hexagonal array with different units, the optimum reconstructed Zernike mode is also different. Smaller array filled factor leads to larger recovery residual error. Compared with array filled factor of 1.0, value of 0.8 is easy to obtain and brings in recovery residual error increment less than 10%. Experimental results reveal that RMS less than 0.075 μm of the recovery residual error is obtained when detecting the static aberration with 7-element AFOC array with filled factor of 0.875. The aberration is with RMS of 0.433 μm and mainly includes Zernike modes of low orders like defocus. Results here validate the effectiveness of the wavefront sensing method proposed here. Such method would get further application in systems like laser array propagating and turbulence aberrations correcting.

李枫, 耿超, 黄冠, 杨燕, 李新阳. 基于光纤耦合的光纤激光阵列像差探测[J]. 光电工程, 2018, 45(4): 170691. Li Feng, Geng Chao, Huang Guan, Yang Yan, Li Xinyang. Wavefront sensing based on fiber coupling of the fiber laser array[J]. Opto-Electronic Engineering, 2018, 45(4): 170691.

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