A picture is worth 1000 words
http://fusionfroide.ch/wp-content/uploads/2012/09/Rossis-HOT-CAT-reactor.jpg
and no, there is no indication that the photons seen here are coherent, or even superradiant. No evidence is possible since there is no lens. The IR light is coming through and/or heating a stainless steel end-cap. If the electrical input power is as low as claimed, then we are probably seeing superradiance, at least.
That is the hollow-tube version, looking end-on into a cavity filled with black-box radiation.
