摘要
研究一种高精度曲线拟合方法,用于评价超小梯度折射率光纤探针的聚焦性能。首先,概述梯度折射率光纤探针模型;其次,根据高斯光束通过梯度折射率光纤探针进行聚焦的特点,提出利用多项式拟合的方法评价聚焦的束腰位置和光斑尺寸;最后,进行评价方法的验证分析。结果显示,由曲线拟合方法得到的工作距离为0.93 mm,束腰直径为28.2μm,与实验测得的工作距离1 mm和束腰直径28μm基本一致。表明所研究的基于多项式拟合的曲线拟合方法适于梯度折射率光纤探针聚焦性能的评价。
A high-precision curve fitting method was investigated so evaluate the focusing performance of an ultra-small gradient-index （GRIN） fiber probe. Firstly, an overview of the GRIN fiber probe model is given. Secondly,according to the characteristics of Gaussian beam focusing through the GRIN fiber probe ,the polynomial fitting method is proposed to evalu- ate the waist position and spot size of the focused beam. Finally,the evaluation method is analyzed for validation. The re- sults show that, with the curve fitting method, the obtained working distance and waist diameter are 0.93 mm and 28.2 μm, respeetively. Under the same conditions, the experimentally measured working distance and waist diameter are 1 mm and 28 13μn,accordingly. The fitting results are in good agreement with the experiment data. Therefore,the proposed polynomial curve fitting method is applicable to evaluate the focusing performance of GRIN fiber probe.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2014年第2期453-459,共7页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(41104065)
上海市教委"晨光计划"(12CG047)
上海市教委科研创新基金(13YZ022)
精密测试技术及仪器国家重点实验室开放基金资助项目
关键词
光学相干层析技术
梯度折射率光纤探针
小型光学探头
曲线拟合
optical coherence tomography （OCT）
gradient-index （GRIN） fiber probe
small optical probe
curve fit- ting
