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Laser cooling, varying magnetic field.

  1. Jun 11, 2008 #1
    Okay, I have been reading the article Laser Deceleration of an Atomic Beam by William D. Phillips see attachment.
    But I have a few problems:

    1. Optical Pumping.
    On page 1, 2. column they write:
    I dont quite get the last part. How can the Zeeman effect change the selection rules?

    2. Messurement of the velocity.
    They decribe how they get the signals A (cooled atoms) and B (not cooled atoms), but how do the analysing laser work, when it messures the fluorescence?
    And how is this fluorescence related to the velocity?

    Hope some of you can give me a helping hand here.
    /Stefan
     

    Attached Files:

  2. jcsd
  3. Jun 13, 2008 #2

    Redbelly98

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    This is a homework problem???

    I'm not entirely sure about the "field produces selection rules" part, it has been over 10 years since I worked in this area. It might help to know what F is for the unused hyperfine ground state (the one for which there is concern about being optically pumped into). Do you know F for this state?
     
  4. Jun 13, 2008 #3

    Redbelly98

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    In Fig. 1, it appears that a lens is used to take the fluorescence (spontaneously emitted light, due to excitation by the analysing laser) and focus it onto a photodetector of some kind.

    It is related to the Doppler shift.
     
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