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Old Aug 11th 2008, 07:15 PM   #1
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Laser

When an excited electrons are unstable with some returning to ground state, photon is emitted which bounces back and forth between mirrors.

Why this photon can stimulate the emission of photons of exactly the same wavelength fron other excited electrons in other atoms, which in turn can stimulate the smission of more photons?
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Old Aug 23rd 2008, 11:05 AM   #2
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the wavelength of emitted photon depends only on material, intensity - on injected energy, if you want to make a powerful device you also need a good cooling.
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