> need precision light source(s) with adjustable wl's.. Or use some substitute technology, for example, calculate diffraction strips digitally and then impleme

> need precision light source(s) with adjustable wl's.. Or use some substitute technology, for example, calculate diffraction strips digitally and then implement them with modern femto-second laser. So could achieve similar result, but (in case of femto-second laser) trade for much larger time and much more energy to create forever storage.