Can multiple lasers of the same force that overlap each other without losing the strength of each individual laser?

Moreover, if multiple lasers of the same force that overlap each other to merge into one power laser from a laser or triple / family a little increase in the strength of the rays laser group due to overlap? What if multiple lasers of different power hit each other at the same time? It would be the stronger laser to replace the weak laser?

Only if the party stages precisely otherwise interfere destructively and reduce performance. Coherent combination of laser is an active are of research, especially with fiber lasers, to increase power output. Think of how combination of two waves of water.

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