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    { "id" : "http://dbpedia.org/resource/Active_laser_medium"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The active laser medium (also called gain medium or lasing medium) is the source of optical gain within a laser.  The gain results from the stimulated emission of electronic or molecular transitions to a lower energy state from a higher energy statepreviously populated by a pump source.Examples of active laser media include:Certain crystals, typically doped with rare-earth ions (e.g." ] ,
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        "http://dbpedia.org/ontology/thumbnail" : [ "http://commons.wikimedia.org/wiki/Special:FilePath/LaserLevels1.png?width=300"] } } }
