| Parameter | LED | LASER |
| Wavelength Content : A monochromatic source consists of radiation of a single wavelength or a very small range of wavelength. | Large | Small (desirable; more monochromatic) |
| Spectral Width/Line Width : The wavelength interval over which the magnitude of all the spectral components is greater than or equal to a specified fraction of the total magnitude, Here, the fraction is (0.707)*P | 50 nm | < 5 nm |
| Principle of Emission | Spontaneous; random photon emission (hence, not directional) | Stimulated |
| Coherence : A constant phase difference between two waves | Incoherent; since emission is spontaneous | Coherent; since emission is stimulated; same phase as the stimulating photon |
| Output Power | Low | High |
Saturday, February 9, 2013
DIFRENCE BETWEEN LED AND LASER
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