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Imaging characteristics of an 8.8 mm long and 125 mu m thick graded-index short multimode fiber probe

机译：8.8毫米长，125微米厚的渐变折射率短多模光纤探头的成像特性

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摘要

We demonstrated the feasibility of an ultrathin imaging probe with a 50-mu m core diameter, a 125 mu m total diameter, and an 8.8 mm length, which is a typical graded-index multimode fiber for optical communications. We used an ABCD matrix to analyze the imaging conditions and magnification, which corresponded closely to the measured results. The lateral resolution was calculated at 1.2 mu m with a wavelength of 730 nm, which reflects the image test pattern where a period of 4.38 mu m was measured with a wavelength of 730 nm. In the numerical aperture of the objective lens, we experimentally evaluated the tradeoff between the magnification and the coupling efficiency. At four wavelengths of 540 nm, 632 nm, 730 nm, and 852 nm, the contrast and signal intensity versus the wavelength were investigated to show that the contrast at 632 and 730 nm is relatively high. By using a thin random phase screen model, we explained that as the wavelength decreases the greater the decrease in the optical transfer function at higher spatial frequencies. Using a 635 nm LED light source, we imaged the surfaces of chicken tendons in contact and the surface roughness was visible. (C) 2016 Optical Society of America
机译：我们证明了纤芯直径为50微米，总直径为125微米，长度为8.8毫米的超薄成像探头的可行性，该探头是用于光通信的典型渐变折射率多模光纤。我们使用ABCD矩阵分析成像条件和放大倍率，这与测量结果非常接近。横向分辨率在波长为730 nm的1.2微米处计算，这反映了图像测试图案，其中在波长730纳米处测量了4.38微米的周期。在物镜的数值孔径中，我们通过实验评估了放大倍数和耦合效率之间的折衷。在540 nm，632 nm，730 nm和852 nm的四个波长下，研究了对比度和信号强度与波长的关系，以显示632和730 nm处的对比度相对较高。通过使用稀薄的随机相位屏幕模型，我们解释了当波长减小时，在较高空间频率下光学传递函数的减小越大。使用635 nm LED光源，我们对接触的鸡腱表面进行了成像，可见其表面粗糙度。 （C）2016美国眼镜学会

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