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Stupid question about fluoresence

  1. Feb 11, 2009 #1
    If you have a phosphor such as ruby (Cr:Al2O3) and you excite it with a light source near its main pump band (~556nm) then you should see emit light with a difference in color from the source light, correct? For example if I shined a green light onto this piece a ruby, it should appear red should it not? Or, does the light source need to be removed in order to see the shifted emitted light? I know this is probably a stupid question but I really need a sanity check right now.
  2. jcsd
  3. Feb 12, 2009 #2

    Andy Resnick

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    Within a laser cavity, the pump light is always on; the endmirrors take care of spectrally filtering the laser light. Look at how diode-pumped Nd:YAGS are set up, for example.
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