If the light source is on such a circle (called Rowland circle), then the light is focused onto the same circle after diffraction. Gratings mounted in the so called Rowland mount (i.e., set-up) have the property to focus spectrally dispersed light in a circle whose diameter is the size of the radius of the concave grating. For instance, the curved Rowland gratings are the simplest optical elements that combine spectral diffraction with focusing properties. This makes possible to have a single element as the complete optical instrument that diffracts and focuses the light onto a plane or curved surface for recording. The light reflected by such gratings is focused in addition to being spectrally dispersed. The problem addressed by the program is the following: concave specular (i.e., reflective) diffraction grating is used in research to obtain focal properties in conjunction with a diffractive element. The program also makes use of the Charting Control of Cedric Moonen: Charting Control ver. The version used for the VTK libs is the 5.4.2 VTK Home. The VTK libs are a 3D rendering engine used in Scientific Visualisation built over the OpenGL graphics base libraries. The article presents the Physics problem that is solved by the software as well as the use under MFC of the VTK (Visualisation Tool Kit) Libraries as used by the program for 3D graphical representation of physical results. The Grating Calculator program is free software available on SourceForge under the GPL GNU License Version 3.0. This is a short introduction to a Physics related piece of software: the Grating Calculator program. Download Grating Calculator sources (VS 2008 SP1) - 592 KB.
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