[fsilva]

Actually supercontinuum lasers are not a recombination of different (incoherent) lasers but rather a 'processed' output from a single laser. You start with a high peak power laser pulse (e.g. a femtosecond mode locked oscillator) and excite a highly nonlinear process that generates new frequencies (e.g. using a special kind of optical fiber), and at the output you have a continuous broad spectrum. What happens in the fiber is actually similar to sea waves arriving on the beach - a very long and well beahaved wave steepens in the leading edge (which means new frequencies were generated) and eventually breaks/collapses into many small waves of much shorter period. The laser in this article is probably 100x or even more cheaper than a setup like this, but also does not have the full coherence supercontinuum sources have, so it will be used for different things.

A picture of the output of a fully coherent white light laser spanning from the uv to ir: http://www.laserfocusworld.com/articles/2011/09/sub-femtosec...

For more cool physics related to this read about frequency combs, which are (most of the time) frequency stabilized supercontinuum lasers.