Document Detail


A compensation method for the full phase retardance nonuniformity in phase-only liquid crystal on silicon spatial light modulators.
MedLine Citation:
PMID:  25401672     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
A simple and efficient compensation method for the full correction of both the anisotropic and isotropic nonuniformity of the light phase retardance in a liquid crystal (LC) layer is presented. This is achieved by accurate measurement of the spatial variation of the LC layer's thickness with the help of a calibrated liquid crystal wedge, rather than solely relying on the light intensity profile recorded using two crossed polarizers. Local phase retardance as a function of the applied voltage is calculated with its LC thickness and a set of reference data measured from the intensity of the reflected light using two crossed polarizers. Compensation of the corresponding phase nonuniformity is realized by applying adjusted local voltage signals for different grey levels. To demonstrate its effectiveness, the proposed method is applied to improve the performance of a phase-only liquid crystal on silicon (LCOS) spatial light modulator (SLM). The power of the first diffraction order measured with the binary phase gratings compensated by this method is compared with that compensated by the conventional crossed-polarizer method. The results show that the phase compensation method proposed here can increase the dynamic range of the first order diffraction power significantly from 15~21 dB to over 38 dB, while the crossed-polarizer method can only increase it to 23 dB.
Authors:
Long Teng; Mike Pivnenko; Brian Robertson; Rong Zhang; Daping Chu
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optics express     Volume:  22     ISSN:  1094-4087     ISO Abbreviation:  Opt Express     Publication Date:  2014 Oct 
Date Detail:
Created Date:  2014-11-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137103     Medline TA:  Opt Express     Country:  United States    
Other Details:
Languages:  eng     Pagination:  26392-402     Citation Subset:  IM    
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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