Focal length measurement by fiber point diffraction longitudinal interferometry

Lingfeng Chen*, Jinjian Hao, Zhipu Chen, Xiaofei Guo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

A focal length measurement method by fiber point-diffraction longitudinal interferometry is proposed. By applying two different longitudinal displacements for the object point respectively and measuring the corresponding displacements of the image point, the lens focal length is derived by Newton formula. The displacements of the object point are introduced by glass plates with known refractive index and thickness. The corresponding displacements of the image point are measured interfeorometrically based on the modeling of the longitudinal interferometry of two point sources. Experiments and error analysis reveal that this method has an accuracy less than 0.15% under normal laboratory environment.

Original languageEnglish
Pages (from-to)48-53
Number of pages6
JournalOptics Communications
Volume322
DOIs
Publication statusPublished - 1 Jul 2014

Keywords

  • Focal length
  • Interferometry
  • Measurement
  • Point diffraction

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Chen, L., Hao, J., Chen, Z., & Guo, X. (2014). Focal length measurement by fiber point diffraction longitudinal interferometry. Optics Communications, 322, 48-53. https://doi.org/10.1016/j.optcom.2014.02.021