Types of Coherent Sources
There are two types of coherence which are mentioned below:
- Temporal Coherence Sources
- Spatial Coherence Sources
Temporal Coherence Sources
Temporal Coherence determines whether phase relationships between waves are stable over time for such phenomena as interference patterns. It measures the consistency with which peaks and troughs of waves align as they travel.
- This coherence is critical in applications such as interferometry, guaranteeing accurate measurements.
- It is influenced by factors such as the source characteristics and propagation medium.
- Lasers often have high temporal coherence which provides very stable phase.
- On the other hand, larger sources may have reduced coherence times.
- Temporal coherence understanding helps in developing systems for efficiency and reliability.
Spatial Coherence Sources
Spatial coherence relates to phase consistency of waves at two or more different points in space but not over time. It defines how well waves maintain their phase coherence in various spatial positions.
- This coherence is vital in fields like imaging as it determines resolution and clarity.
- Spatial coherence is affected by character of the source and propagation conditions.
- High spatial coherence results in sharp wave fronts and focused beams.
- This facilitates enhanced performance and accuracy in optical systems based on spatial coherence.
Coherent Source
Coherent Source is the source of waves that produce waves with the same frequency, same wavelength, and constant phase or constant phase difference. Coherent Sources are important in wave optics as they provide conditions for interference of waves to produce highly focussed and directional beam of light.
In this article, we will learn about coherent source, its types, characteristics, how to produce coherent source, its application and difference between coherent and incoherent source in detail.
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