On an airplane in Europe, I had a great conversation with Dr. G. Tempea, a laser physicist, regarding spectral resolution.
Design ideas: - could the resolution be increased by using a Blu-Ray DVD as the diffraction grating? - could the resolution be increased by using a camera with a larger sensor? Higher megapixels? - what are the CCD limitations? - could the resolution be increased by increasing the distance between the diffraction grating and the "screen?"
Application idea: - color calibration for computer monitors. Right now, the software to do color matching (for printing, among other things) is expensive and proprietary.