Document Detail


Calibration of spatial light modulators suffering from spatially varying phase response.
MedLine Citation:
PMID:  23842396     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
We present a method for converting the desired phase values of a hologram to the correct pixel addressing values of a spatial light modulator (SLM), taking into account detailed spatial variations in the phase response of the SLM. In addition to thickness variations in the liquid crystal layer of the SLM, we also show that these variations in phase response can be caused by a non-uniform electric drive scheme in the SLM or by local heating caused by the incident laser beam. We demonstrate that the use of a global look-up table (LUT), even in combination with a spatially varying scale factor, generally does not yield sufficiently accurate conversion for applications requiring highly controllable output fields, such as holographic optical trapping (HOT). We therefore propose a method where the pixel addressing values are given by a three-dimensional polynomial, with two of the variables being the (x, y)-positions of the pixels, and the third their desired phase values. The coefficients of the polynomial are determined by measuring the phase response in 8×8 sub-sections of the SLM surface; the degree of the polynomial is optimized so that the polynomial expression nearly replicates the measurement in the measurement points, while still showing a good interpolation behavior in between. The polynomial evaluation increases the total computation time for hologram generation by only a few percent. Compared to conventional phase conversion methods, for an SLM with varying phase response, we found that the proposed method increases the control of the trap intensities in HOT, and efficiently prevents the appearance of strong unwanted 0th order diffraction that commonly occurs in SLM systems.
Authors:
David Engström; Martin Persson; Jörgen Bengtsson; Mattias Goksör
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optics express     Volume:  21     ISSN:  1094-4087     ISO Abbreviation:  Opt Express     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-07-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137103     Medline TA:  Opt Express     Country:  United States    
Other Details:
Languages:  eng     Pagination:  16086-103     Citation Subset:  IM    
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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