LCoS display phase self-calibration method based on diffractive lens schemes

Haolin Zhang, Angel Lizana, Claudio Iemmi, Freddy A. Monroy-Ramírez, Andrés Márquez, Ignacio Moreno, Juan Campos

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)

Abstract

© 2018 Elsevier Ltd An experimental method to calibrate Liquid Crystal on Silicon (LCoS) displays by self-generating lens configurations on the studied device is proposed in this paper. On the one hand, a split-lens is displayed in the LCoS to self-generate an interference pattern from which the phase-voltage curve of the modulator is calculated. On the other hand, a microlens array is displayed on the LCoS, within a same experimental set-up, to implement a Shack-Hartmann (S-H) wavefront sensor, from which the display surface profile is retrieved. Specifically, by means of a feasible set-up, the proposed method allows measuring the deviation from flatness of the LCoS displays as well as to determine the phase-voltage response of phase-only SLMs. Experimental results demonstrate a linear tendency phase-voltage curve that ranges from 0 rad up to ∼6.28 rad, for the used light wavelength. Moreover, by extracting the LCoS phase distribution measured with the S-H configuration, the LCoS surface inhomogeneity is corrected by 95%.
Original languageEnglish
Pages (from-to)147-154
JournalOptics and Lasers in Engineering
Volume106
DOIs
Publication statusPublished - 1 Jul 2018

Keywords

  • Calibration
  • Liquid crystals
  • Optical metrology
  • Phase shifting interferometry
  • Surface measurement

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