• What is the relation between Coherence length and Quality factor of a light signal?
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The temporal coherence time is the time the wave-fronts remain equally spaced. That is, the field remains sinusoidal with one wavelength: The spatial coherence length is the distance over which the beam wave-fronts remain flat: Since there are two transverse dimensions, we can define a coherence area.
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- Coherent length (CL) is the maximum distance traveled by a beam of light or any other electromagnetic phenomenon while maintaining a specified degree of temporal coherence (shape of a propagating wave or the prediction of a wave’s phase at a specific moment of time). The light wave will remain in phase with itself if it is coherent. Coherence length depends on the specific wavelength, diffraction, potential dispersion, power, and purity of the light. It is very important in telecommunication engineering and holography.
- Quality factor (Q factor) is either defined as the ratio of the resonator’s center frequency to its bandwidth when an oscillating driving force is applied to it or, in one radian of the cycle of oscillation ratio of the energy stored in the resonator to the lost energy.
- There is no relationship observed between the coherent length and quality factor of the light signal as of now.
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