|
Laser light |
Ordinary light |
| It is highly coherent. | It is incoherent in nature. |
| There coherence length as of the order of few km (Kilometer). | There coherence length as of the order of few mm (Millimeter). |
| It is travel in only one direction, which is parallel to the optic axis. | Intensity of ordinary light decreases with distance as it travels in form of short pulses of small length and short duration. |
| It is highly monochromatic as it travels in form of large length and long duration. | It is not strictly monochromatic as it travels in form of short pulses of small length and short duration. |
| Spread of plane wave front is less hence they spread least i.e. their divergence is less. | Spread of spherical wave font is more hence they spread heavily i.e. their divergence is more |
 Laser Light Beam |
 Ordinary light |