Power scaling of a laser is increasing its output power without changing the geometry, shape, or principle of operation. Power scalability is considered an important advantage in a laser design.
Usually, power scaling requires a more powerful pump source, stronger cooling, and an increase in size. It may also require reduction of the background loss in the laser resonator and, in particular, in the gain medium.
Read more about Power Scaling: MOPA, Problem of Heat Sink, Coherent Addition and Combining Beams
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—Henri-Frédéric Amiel (1821–1881)