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| 1 | Ultra-thin 3D lensless fiber endoscopy using diffractive optical elements and deep neural networks显示文摘Minimally invasive endoscopes are indispensable in biomedicine.Coherent fiber bundles(CFBs)enable ultrathin lensless endoscopes.However,the propagation of light through a CFB suffers from phase distortions and aberrations that can cause images to be scrambled.The correction of such aberrations has been demonstrated using various techniques for wavefront control,especially using spatial light modulators(SLMs).This study investigates a novel aberration correction without SLM for the creation of an efficient and compact system.The memory effect of CFBs enables a paradigm shift in the use of static diffractive optical elements(DOEs)instead of dynamic modulation with SLM.We introduce DOEs produced by 2-photon polymerization lithography for phase conjugation on a CFB for focusing,raster scanning,and imaging.Furthermore,a DOE with random patterns is used to encode the three-dimensional(3D)object information in a 2D speckle pattern that propagates along the ultra-thin CFB.Neural networks decode the speckles to retrieve the 3D object information using single-shot imaging.Both DOE methods have compact low-cost concepts in common,and both pave the way for minimally invasive 3D endomicroscopy with benefits for optical imaging in biomedicine. | Robert Kuschmierz Elias Scharf David F.Ortegón-González Tom Glosemeyer Jürgen W.Czarske | 2021 | Light(Advanced Manufacturing)2021，2，4： | 5 |
| 2 | 光栅刻划刀具弹性支撑机构颤振抑制性能优化显示文摘机械刻划是以中阶梯光栅为主导的大闪耀角、高衍射级次光栅的主要加工方法,其大闪耀角特性使中阶梯光栅的刻划加工难度大幅增加。当光栅刻划刀对刃误差较大,或刀具非力平衡设计时,刻划过程中刀具会受到较大水平扭矩,易导致刀具颤振现象,从而影响光栅质量。为抑制刀具颤振,提高光栅刻划稳定性,针对光栅刻划刀弹性支撑机构的颤振抑制性能开展研究,提出了双层平行弹簧支撑机构。通过有限元仿真对比分析了新旧刀架机构的结构刚度和模态特性,并利用加速度传感器测试了两种刀架机构的刻划刀具颤振状态,对比了两种刀架对颤振的抑制效果。结果表明,双层平行弹簧刀架机构受刻划扭矩时,在刀具夹持处及柔性铰链处的变形较传统刀架结构分别减少了36%和24%,一阶模态提升了2.8倍。颤振信号在时域下基线两侧幅值分别降低了13.6%及22.5%。光栅刻划实验表明,新机构有利于刻划制造中阶梯光栅,所提出的刀架优化设计方法和颤振抑制技术可为光栅刻划制造技术提供理论指导。 | 于硕 王玮 李文昊 吉日嘎兰图 | 2023 | 光学精密工程2023，31，13： | 0 |
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