Answer :

The emission of the light waves in the lasers allows them to overlap properly to create larger waves, which means that identical parts of the two waves overlap.

One of the characteristics of waves is interference, which happens when two waves travelling across the same medium interact or collide. Therefore, interference of waves occurs when identical portions of two waves cross one other.

Overlap of waves can occur in two ways, a constructive or destructive interference might emerge from two similar waves overlapping. When identical waves with comparable phase and frequency interact or collide, a new wave with a bigger amplitude is produced. This is known as constructive interference.

When two waves overlap, destructive interference happens because the resulting wave's amplitude is reduced.

In the case of laser, in which radiations get amplified, we get constructive interference which is only possible when the identical parts of the two waves overlap

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