Incoherent Light Source

Introduction to Incoherent Light Source:

Incoherent light source is any source of light which emit light of several wavelengths or say emit light of several colors shown in the case of the sun which is a best example of incoherent light source. The incoherent light sources are emitting light not only with different wavelengths but it emits light with different frequency and different amplitude and the light waves are out of phase. Different amplitude implies that if one light, emitted by the source has higher intensity than that of the other or say the content of one particular light is greater in the source rather compare to the other component of lights. The phase difference between the different light and say different color implies that if one color is emit at a particular angle than it is not necessary that all other colors present in the light source should have the same angle.

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Comparison of Incoherent and Coherent Light Sources


In the coherent light sources any two sources are said to be coherent if they emit light waves of the same frequency and nearly same amplitude and are always in phase with each other. These all properties are not satisfied by an incoherent light source as discussed above.

The coherent light source always exists in pair whereas the incoherent light source exists in single.

The coherent light source can be made using a single incoherent light source but the incoherent light source is generally exists in the nature.

Most of the light sources exist in the general life are incoherent whereas the coherent light sources are made in laboratory under specific conditions.


Conclusion for Incoherent Sources of Light


As per the discussion, we see that, when we observe the interference pattern of a coherent light source it shows a series of dark and bright bands with equal width on the both sides of the central band which either dark or bright but in case of the incoherent light source the interference pattern show mostly the central band as bright and the bands appears on the both side of it might be colored or dark and bright but the width of the bands is not equal.