laser spark plugs?

About a year or so ago I read an article in an aviation magazine that was talking about laser ignition for aircraft. One of the benefits was that one of the laser beams acted as a probe for an engine analyzer so you could check how all cylinders were operating. I thought that would be pretty cool since modern aircraft engines are still 1930's technology, although tcm who makes continental engines has a fadec (full authority digital engine control) system in some airplanes.
 
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