Summary | Source files | Compilation | Precompiled | References

MagBragg

A simulator for nonlinear magneto-optical Bragg gratings, numerically solving the inverse problem of light scattering for arbitrary polatization state of the light. For an extensive description of the algorithms used in the program, supported command-line options and syntax, as well as the full documentation of the source, see magbragg.pdf [852 kB, 148 pages].

Figure 1. Example of a spectrum calculated by MagBragg in a linear optical regime. The graph shows the relative intensity transmission I_tr/I_in as function of vacuum wavelength λ, for a left circularly polarized incident beam and a magneto-optical perturbation with amplitude g_p=5.0×10^-3 and width w_p=75μm at center positions (a) z_p=0.8 mm, (b) z_p=1.4 mm, (c) z_p=2.0 mm, (d) z_p=2.6 mm, and (e) z_p=3.2 mm. [From Jonsson & Flytzanis, J. Opt. Soc. Am. B 22, 293 (2005)]

Summary of the program

The MagBragg computer program calculates reflection and transmission spectra of nonlinear magneto-optical Bragg gratings, in a stratified geometry where the material parameters vary only in one Cartesian coordinate. The MagBragg program also simulates the propagation of the electromagnetic field of an optical wave as it traverses a magneto-optical Bragg grating, giving the intra-grating spatial distribution of the optical fields in linear as well as nonlinear optical regimes. The MagBragg program forms the core behind the semi-analytical algorithm that was published in Phys. Rev. Lett. 96, 063902 (2006).

Several sets of options allow the user to modify and perturb the grating structure, both in all-optical as well as magneto-optical aspects, in a linear as well as a nonlinear optical domain. Particular attentiion has been paid to provide all possible modifications as accessible via command line options supplied to the program at startup time. The general algorithm of calculation and related physics are together with examples described in Refs. [5-8].

The MagBragg program is written in CWEB, generating ANSI-C (ISO 9899/C90) conforming source code and documentation as plain TeX-source, and is to be compiled using the sequences as outlined in the enclosed Makefile. The Makefile essentially executes two major calls. First, the CTANGLE program parses the CWEB source document 'magbragg.w' to extract a ANSI-C source file 'magbragg.c', which may be compiled in the usual way using any ANSI-C conformant compiler. The output source file includes #line specifications so that any debugging can be done conveniently in terms of the original CWEB source file. Second, the CWEAVE program parses the same CWEB source file to extract a plain TeX source file 'magbragg.tex' which may be compiled in the usual way. It takes appropriate care of typographic details like page layout and the use of indentation, italics, boldface, and so on, and it supplies extensive automatically gathered cross-index information.

After having executed make in the same catalogue where the files magbragg.w and Makefile are located, one is left with an executable file magbragg, being the ready-to-use compiled program, and a PostScript file magbragg.ps which contains the full documentation of the program. Notice that on platforms running Windows NT, Windows 2000, Windows ME, or any other operating system by Microsoft, the executable file will instead automatically be called magbragg.exe. This convention also applies to programs compiled under the UNIX-like environment CYGWIN.

Current revision

Revision 1.43, as of 10/01/2007. Copyright © Fredrik Jonsson 2002-2007, under GPL

Source files

Compilation

Compile the CWEB [1] code 'magbragg.w' using the enclosed Makefile, or use the blocks of the Makefile as listed in section 27 of the documentation.

Precompiled executables

References

[1] For information on the CWEB programming language as written by Donald E. Knuth, as well as samples of CWEB programs, see Knuth's homepage at http://www-cs-faculty.stanford.edu/~knuth/cweb.html For information on literate programming, as well as additional CWEB examples, see http://www.literateprogramming.com

[2] For information on the Portable Document Format (PDF) of Adobe, see for example the homepage of Adobe Systems Inc., at http://www.adobe.com/products/acrobat/

[3] For information on the TeX typesetting system, as well as on the dvips program, see for example the website of the TeX Users Group, at http://www.tug.org

[4] For information on the PostScript programming language, see for example the PostScript area on the website of Adobe Systems Inc., at http://www.adobe.com/products/postscript/ or the reference book "PostScript Language - Tutorial and Cookbook" (Adison-Wesley, Reading, Massachusetts, 1985), ISBN 0-201-10179-3.

[5] F. Jonsson and C. Flytzanis, Phys. Rev. Lett. 82, 1426 (1999) .

[6] F. Jonsson and C. Flytzanis, J. Nonlin. Opt. Phys. Mat. 13, 129 (2004) .

[7] F. Jonsson and C. Flytzanis, J. Opt. Soc. Am. B 22, 293 (2005) .

[8] F. Jonsson and C. Flytzanis, Phys. Rev. Lett. 96, 063902 (2006) .

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