An approach to achieve lateral superresolution for small probe confocal measurement system and its element

Weiqian Zhao, Qi Li, Lirong Qiu, Jiubin Tan, Qi Wang

科研成果: 期刊稿件文章同行评审

摘要

A shaped annular beam superresolution approach is proposed to improve a lateral resolution of a small probe laser confocal measurement system (LCMS). The approach proposed enables lateral superresolution measurement of LCMS to be achieved by using a binary optical diffractive element to shape a He-Ne Gaussian laser beam into an annular beam with an inner diameter of 0.87 mm and an outer diameter of 1.8 mm required for superresolution measurement, and shift the beam spatial frequency from low to high. And a binary optical element (BOE) with 16 phase levels is designed and fabricated to shape a Gaussian laser beam into an annular beam. Preliminary experimental results indicate that an intensity distribution of a shaped annular beam is in agreement with simulation results, the diffractive efficiency is 87.2%; LCMS lateral and axial resolutions of 0.2 μm and 3 nm are achieved, respectively, and its measurement range is expanded nearly to double, when BOE is used in LCMS and λ=0.6328μm, NA=0.85.

源语言英语
页(从-至)557-562
页数6
期刊Optik
116
12
DOI
出版状态已出版 - 24 11月 2005
已对外发布

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