http://swiss.csail.mit.edu/~jaffer/FreeSnell/
	FreeSnell
	Current Version Released Terms 1b7 2008-02-03 GPL 3.0

FreeSnell is a program to compute optical properties of multilayer thin-film coatings.

FreeSnell is an application of the SCM Scheme implementation and the WB B-tree database package.

News

• MS-Windows installer.
• FreeSnell-discuss email group.
• Colorful new logo.
• Interactive nk-shell.
• More in ANNOUNCE.txt.

x86 MS-Windows Installation

• Obtain slib-3b1-1.exe (1.1.MB) and run.
• Obtain scm-5e5-1.exe (475.kB) and run.
• Obtain FreeSnell-1b7-1.exe (700.kB) and run.

x86 GNU/Linux with RPM Installation

• Obtain SLIB, SCM, WB, and FreeSnell:

  #! /bin/sh
  wget http://swiss.csail.mit.edu/ftpdir/scm/slib-3b1-1.noarch.rpm
  wget http://swiss.csail.mit.edu/ftpdir/scm/scm-5e5-1.i386.rpm
  wget http://swiss.csail.mit.edu/ftpdir/scm/wb-2a2-1.i386.rpm
  wget http://swiss.csail.mit.edu/ftpdir/scm/FreeSnell-1b7.zip
  rpm -U slib-3b1-1.noarch.rpm scm-5e5-1.i386.rpm wb-2a2-1.i386.rpm
  unzip FreeSnell-1b7.zip
  (cd FreeSnell; make install)
  

Unix (Including GNU/Linux) Installation

• Obtain SLIB, SCM, WB, and FreeSnell:

  #! /bin/sh
  wget http://swiss.csail.mit.edu/ftpdir/scm/slib-3b1.zip
  wget http://swiss.csail.mit.edu/ftpdir/scm/scm-5e5.zip
  wget http://swiss.csail.mit.edu/ftpdir/scm/wb-2a2.zip
  wget http://swiss.csail.mit.edu/ftpdir/scm/FreeSnell-1b7.zip
  unzip slib-3b1.zip
  unzip scm-5e5.zip
  unzip wb-2a2.zip
  unzip FreeSnell-1b7.zip
  (cd slib; make install)
  (cd scm; make scmlit; make scm5; make mydlls; make db.so; make install)
  (cd FreeSnell; make install)
  

Viewing Graphs

• ImageMagick: Install from Binary Distribution
• Ghostscript, Ghostview and GSview

Running

You can then type expressions to the SCM interpreter. To run FreeSnell's regression suites type:

(load "dielectric.scm")
(dielectric)
(load "metallic.scm")
(metallic)
(load "granular.scm")
(granular)
(load "coherence.scm")
(coherence)
(load "polyethylene.scm")
(polyethylene)

Documentation

• Online FreeSnell Manual or FreeSnell.pdf

	Refractive Index Spectra. Sources nk spectral database management script
	Validation suite of dielectric filters; generated from "dielectric.scm". Bandpass Filter Polarizers Anti-Reflection Coatings Dielectric Mirrors
	Validation of metallic films; generated from "metallic.scm". Thick Reflective Metal Thin Metal Films Matching Measured Data
	How granular films work in FreeSnell; generated from "granular.scm". IRG-II GranFilm The Colors of Silver and Gold Colors of Zinc Sulfide
	How thick films work in FreeSnell; generated from "coherence.scm". Coherence Incoherence Gaussian Filtering
	Characterizing Polyethylene; generated from "polyethylene.scm". Background Emissivity Absorption Lines Thin HDPE Films Thick HDPE Films

FreeSnell Development

• Savannah: CVS Repository freesnell/freesnell
• Development Snapshot FreeSnell.zip (612.kB)
• FreeSnell discussion mailing list

Volunteer opportunities

• Implement reading and writing of designs in Optical-Thin-Film-Exchange format.
  Click to join otfe.
  

• Luxpop: Thin film and bulk index of refraction and photonics calculations links to a directory of 425 refractive-index files, mostly X-ray spectra. 51 of the files are concatenations of 105 smaller files. But some of these concatenations have large gaps where the n and k values differ significantly across the gap. So this collection is in need of some curating before incorporation into FreeSnell's database. When all duplicates are removed there are 174 files. H2O.nk is empty.

  The infrared data from Luxpop shows that dielectrics (eg. TiO2, Al2O3) having nearly flat n and zero k through the visible range have large and varying k values in the far infrared region. This would appear to be blackbody emissivity (and absorption).

• Another potential source of refractive-index spectra is http://www.rpi.edu/~schubert/Educational resources/Materials - refractive index and extinction coefficient.pdf, although the PDF does not facilitate easy extraction of the data.