I am using Rhodamine6G as gain medium and silver nanoparticles as scatterers on a microscope slide and laser input 532 nm comes from above.
With only a photograph and your few words of description it is hard to be sure. However, from your description I probably wouldn’t call that a laser. I think most people’s definition of lasing implies the field has an opportunity to build up upon itself. Usually that is from confining the light so it makes multiple passes through the gain. However, I think a single pass amplifier is rightfully said to be lasing, but there we are talking about some path length so the field has a chance to grow and build on itself. There are certainly “random” lasers where the light doesn’t have a well controlled optical path. Nevertheless, in those cases there is still a means for the field to build up. For example a confined cavity with scattering walls.
As you may have guessed this is not a very rigid definition. This is more like common usage of a word rather than precise definition. The difference between a laser amplifier and simple fluorescence is perhaps only a matter of length. However, if most the fluorescence exits the medium without itself causing more fluorescence, it certainly isn’t lasing. If it causes some additional fluorescence, but not much it’s called Amplified Spontaneous Emission (ASE). If it really grows quite a lot, then you could debate whether that could be said to be lasing.
but in your case, with a thin layer on a microscope slide combined with scatterers, I doubt there is much opportunity for the induced fluorescence to itself drive any additional fluorescence. So that’s pretty clearly not a laser.
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