Computer Program Detail Page

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written by Dr. Enrique Galvez
This is a Matlab program to generate a forked diffraction pattern that produces Laguerre-Gauss (LG) beams. Its primary use is for loading it onto a spatial light modulator (Cambridge correlators). The program can produce a phase blaze as well as a binary grating. The phase blaze is for improving the diffraction efficiency. A binary-grating pattern could be printed and the negative of a black & white photograph of it could become a passive diffraction grating.  

Other parameters that can be varied are:
-the line density of the pattern, which controls the diffraction angle,
-the topological charge "l" of the fork, which ends up generating an LG beam with topological charge on first-order diffraction. In LG beams the phase varies with angle, so "l" is the number of times that the phase changes by 2-pi per turn around the center of the beam. The center of the beam has an optical vortex. For more information see: E.J. Galvez, Am. J. Phys. 74, 355-361 (2006).
-an option for amplitude modulation, which generates a purer spatial mode
-an option to correct when the SLM does not vary from 0 to 2-pi in phase encoding.

This program will be referred to in an upcoming article in the Am. J. Phys. on a new undergraduate lab on Poincare beams, which first generate LG beams.
2 supplemental documents are available
Subjects Levels Resource Types
Optics
- Diffraction
- Modern Optics
- Upper Undergraduate
- Graduate/Professional
- Lower Undergraduate
- Instructional Material
= Laboratory
- Tool
= Software
Material Category Lab Software Type Ratings
- Software Exchange
- Computer Code
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Intended Users:
Educator
Learner
Researcher
Formats:
application/matlab
application/pdf
Access Rights:
Free access
License:
This material is released into the Public Domain. No restrictions for non-commercial purposes.
Rights Holder:
Enrique Galvez
Type:
Matlab program
Keywords:
Diffraction grating, Laguerre-Gauss beams
Record Creator:
Metadata instance created March 2, 2016 by Enrique Galvez
Record Updated:
March 16, 2016 by Bruce Mason
Other Collections:

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Record Link
AIP Format
E. Galvez, Computer Program FORKED DIFFRACTION PATTERN, Version 1.0 (2016), WWW Document, (http://departments.colgate.edu/physics/gpl.htm).
AJP/PRST-PER
E. Galvez, Computer Program FORKED DIFFRACTION PATTERN, Version 1.0 (2016), <http://departments.colgate.edu/physics/gpl.htm>.
APA Format
Galvez, E. (2016). Forked diffraction pattern (Version 1.0) [Computer software]. Retrieved June 27, 2017, from http://departments.colgate.edu/physics/gpl.htm
Chicago Format
Galvez, Enrique. "Forked diffraction pattern." Version 1.0. http://departments.colgate.edu/physics/gpl.htm (accessed 27 June 2017).
MLA Format
Galvez, Enrique. Forked diffraction pattern. Vers. 1.0. Computer software. 2016. Matlab program. 27 June 2017 <http://departments.colgate.edu/physics/gpl.htm>.
BibTeX Export Format
@misc{ Author = "Enrique Galvez", Title = {Forked diffraction pattern}, Year = {2016} }
Refer Export Format

%A Enrique Galvez
%T Forked diffraction pattern
%D 2016
%U http://departments.colgate.edu/physics/gpl.htm
%O 1.0
%O Matlab program
%O application/matlab
%O Matlab program

EndNote Export Format

%0 Computer Program
%A Galvez, Enrique
%D 2016
%T Forked diffraction pattern
%7 1.0
%9 Matlab program
%U http://departments.colgate.edu/physics/gpl.htm


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