Laser
Feature and Applied Field of Laser Light
Coherent is originally a meaning of "It is about order". The laser light is coherent ray.
| Character | General ray | Laser light |
| monochromaticity | Because the light of various wavelength exists together, monochromaticity is not good. | monochromaticity is good because it is composed because of the light only of single wavelength.
The laser light is used for the separation and the spectrum analysis of the isotope by this character. |
| coherence | Because the light of various wavelength and the phase exists together,coherence is not good. | Because wavelength and the phase are constant, coherence is good.
The laser light is used for picking up of holography and the optical disk by this character. |
| directivity | The ray radiated from the source of light diffuses in all directions. | The diffusion of the laser light is extremely small. The laser light is used for picking up of the optical disk by this character. |
| energy density | Even if the sun light is concentrated on one point with the convex lens, the effect is extent in which paper and wood are burnt. The energy density of the sun light is low. | The energy density of the laser light is large. Therefore, it is possible to weld by concentrating the laser light on one point with the convex lens.
The laser light is used for the laser beam machining, the laser surgical unit, and the laser welding. |