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Coherent addition (or coherent combining) of lasers is a way to increase the output power and brightness of single-transversal mode laser. Usually, it 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 considered as a way of power scaling of Raman lasers.
Additional recommended knowledge
Limits of coherent addition
The addition of lasers reduces the number of longitudinal modes in the output beam; the more lasers are combined, the smaller is number of longitudinal modes in the output. The number of output modes reduces exponentially with number of lasers combined. Of order of 8 lasers can be combined in such a way. The future increase of number of combined lasers requires the exponential growth of the spectral bandwidth of gain and/or length of partial lasers. The combinaiton of more than 10 lasers in such a way should be difficult if at all.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Coherent_addition". A list of authors is available in Wikipedia.|