Coherent addition (or coherent combining) of lasers is one of methods of the power scaling. It allows a to increase the output power and brightness of single-transversal mode laser.
Usually, the term coherent addition applies to fiber lasers. As the ability of pumping and/or cooling of a single laser is saturated, several similar lasers can be forced to oscillate in phase with common coupler. The coherent addition was demonstrated in power scaling of Raman lasers.
Read more about Coherent Addition: Limits of Coherent Addition
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