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If you know the wavelength of light emitted by a laser how can you know

  1. Apr 20, 2010 #1
    1. The problem statement, all variables and given/known data
    How can you know "the difference between the two lasing energy levels?"


    2. Relevant equations
    n(lambda) = 2(pi)r
    E = hf
    mvr = n(h-bar)
    3. The attempt at a solution
    no clue
     
  2. jcsd
  3. Apr 20, 2010 #2

    kuruman

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    You know that E = hf. How is the the frequency related to the wavelength?
     
  4. Apr 20, 2010 #3
    I know how to find the energy of the given wavelength, but how do I find the other lasing energy level? What is a lasing energy anyway, and why are there 2?
     
  5. Apr 20, 2010 #4

    kuruman

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    You are looking for the difference between energy levels. How is the difference related to the emitted photon energy?
     
  6. Apr 20, 2010 #5
    If u r talking abt 2 levels laser, then the emitted photon energy is the same as the difference between th two lasing levels
     
  7. Apr 20, 2010 #6
    The two are equivalent; so the lasing energy levels are just the levels that the electrons jump to release the photon?
     
  8. Apr 20, 2010 #7

    kuruman

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  9. Apr 20, 2010 #8
    That's simple enough; I was just confused over the terminology; thanks!
     
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