what are coherent sources

Coherent sources are sources of waves that emit waves of the same frequency, wavelength, and phase or have a constant phase difference. They produce sustained interference patterns when the waves superimpose, and the positions of maxima and minima are fixed. Coherent sources are characterized by various features like phase, amplitude, frequency, and period. Examples of coherent sources include sound waves produced by speakers, lasers, and small sources of light. Coherent sources are produced by using prisms, lenses, and mirrors with specific specifications. The division of the wavefront takes place to produce a coherent source, and considering the incoming beam and dividing its amplitude into various parts through a process of partial reflection or refraction aids in the creation of coherent sources. Coherence controls the visibility or contrast of interference patterns).