There are three methods that I know of to change the frequency of light.
Adsorption/conversion/emittance electronic devices. Infrared viewers as an example.
Gravity/time variation between emission source and detector. Blue/red shift due to gravity well.
Relative motion between source and detector. Relative blue and red shifts seen in observing the rotations of galaxies.
You also might want to check out "hetrodyning" and see if this principle is applicable to your invention.
Make the guy build a gravity lens!
All M's suggestions are correct, but the easiest is a prism. This will split the visible spectrum into it's component colors (freq's).
Hetero-dyning works very well with RF freq's. Put ant 2 freq's into any non-linear device and you will get out the orig 2 freq's also the sum and difference freq's.
Any Specifics, we won't steal your ideas!
25th April 2008 - 01:39 AM
Heterodyne also works with light, using nonlinear crystals. The same crystals that double or triple frequencies. They need huge power densities - at least from the local oscillator - as usual.