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Excitation may not take place in a laser (or the like) for a number of reasons. The lasing medium may be defective or contaminated and unable to lase. The stimulation may be insufficient or incorrect. There are other technical reasons that prevent stimulation emission from taking place, but they generally have to do with the lasing medium or the action of the stimulator. Our friends at Wikipedia have a some relevant articles up, and links are provided. Knowledge there is free.

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โˆ™ 2008-02-19 08:40:32
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Q: Why does the excitation of molecules not take place during the stimulted emission process?
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