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Biologic lasers

Discussion in 'Ask Jack' started by drezy, Jun 29, 2018.

  1. drezy

    drezy New Member

    Do you think biologic lasers are used for cooling?
     
    JanSz likes this.
  2. drezy

    drezy New Member

    Simplified principle of Doppler laser cooling:
    1 A stationary atom sees the laser neither red- nor blue-shifted and does not absorb the photon.
    2 An atom moving away from the laser sees it red-shifted and does not absorb the photon.
    3.1 An atom moving towards the laser sees it blue-shifted and absorbs the photon, slowing the atom.
    3.2 The photon excites the atom, moving an electron to a higher quantum state.
    3.3 The atom re-emits a photon. As its direction is random, there is no net change in momentum over many absorption-emission cycles.
    [​IMG]
     
  3. drezy

    drezy New Member

  4. Jack Kruse

    Jack Kruse Administrator

    they can be.
     
  5. drezy

    drezy New Member

    Oh, past drezy. Cute idea, but keep in mind that laser cooling is a nice start but so far nothing has shown to beat a magnetic trap for cooling...

    "...the light scattering involved in laser cooling limits you to a temperature that's too high for making Bose-Einstein condensation (BEC). This time out, we'll talk about how you actually get to those ultra-cold temperatures."

    from:
    https://scienceblogs.com/principles/2013/08/15/tools-of-the-cold-atom-trade-evaporative-cooling

    Magnetic trap:
    magtrap.png
     
  6. Jack Kruse

    Jack Kruse Administrator

    Nothing violates the 2nd law.

    We appear to dance on it because we use its statistical nature and we also have to erase some of the information we collect about the environment every so often so we do not violate it.

    This is why all living things sleep and get rid of older neuron networks for newer ones.
     
    JanSz likes this.
  7. Jack Kruse

    Jack Kruse Administrator

    ^^^That is how the demon operates and stays in line with the 2nd law.
     
    JanSz and drezy like this.

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