Laser Blue

Laser Blue

Can a red and blue laser interfere and give another colour ?

IF we need to make a third colour from laser colour ... Is it possible ?

Nope... LASER light is monochromatic, so it basically contains a pure sinusoidal wave of a certain frequency. When you make two lasers of different color interfere, you get the superposition of two pure sinusoidal waves of different frequencies, which is not a pure sinusoidal wave, unless both LASERS have the same frequency.

furthermore, you would lose coherence (all photons not only have the same frequency, but the same phase at well), which makes no sense in a non-pure wave.

If you want to play around and see what the superposition of two (or more) waves looks like, take a look at this applet:

http://www.falstad.com/fourier/

Laser Blue

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