1.Monochromatic:-
2.Intensity:-
The intensity is the power transferred per unit area.laser light is concentrated to very small region.
Therefore 1 watt source laser light is more intense than 100 watt bulb.
3.Coherence:-
Two sources of light are said to be coherent if the waves emitted from them have the same frequency and are 'phase-linked'; that is, they have a zero or constant phase difference.it spread through t spherical wave fronts.There are two types of coherence - spatial and temporal Correlation between the waves at one place at different times, or along the path of a beam at a single instant, are effectively the same thing, and are called "temporal coherence". Correlation between different places (but not along the path) is called "spatial coherence".
Coherent source (laser)
| |
 |  |
Incoherent source
| |
 |  |
4.Directionality:-
Laser light radiate in only one direction.while other source radiate in many directions.laser travel more distance as compared to the other ordinary sources.laser is highly directional.
5.Divergence:-
lasers are subject to divergence, which is measured in milliradians (mrad) or degrees. For many applications, a lower-divergence beam is preferable. Neglecting divergence due to poor beam quality, the divergence of a laser beam is proportional to its wavelength and inversely proportional to the diameter of the beam at its narrowest point. For example, an ultraviolet laser that emits at a wavelength of 308 nm will have a lower divergence than an infrared laser at 808 nm, if both have the same minimum beam diameter. The divergence of good-quality laser beams is modeled using the mathematics of Gaussian beams.
No comments:
Post a Comment