How do you focus regular light to make it a laser beam???
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A laser is created when the electrons in atoms in special glasses, crystals, or gases absorb energy from an electrical current or another laser and become “excited.” The excited electrons move from a lower-energy orbit to a higher-energy orbit around the atom's nucleus
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1. The waves have to have approximately the same wavelength (temporal coherence) ...
2. The waves have to be in phase (spectral coherence) ...
3. The waves have to be locally traveling in the same direction (spatial coherence) ...
4. The waves have to be the same polarization (polarization coherence)
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