Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I Randomised phase of laser

  1. Mar 17, 2016 #1
    What does it mean when we say that the in the case of absence of a phase reference, the laser would produce a Poissonian mixture of number states?.. I got confused actually between the meaning of the phase in classical sense and quantum in this regard. Regards
  2. jcsd
  3. Mar 21, 2016 #2


    User Avatar
    Science Advisor

    The quantum state ##|\psi\rangle= c_0|0\rangle+c_1 |1 \rangle +c_2|2\rangle \ldots ## is a superposition of number states.
    If the square of the coefficients ##|c_i|^2## follows a Poisson distribution and ##c_{n+1}/c_n \sim \exp(i\phi)##, then this state is a coherent state with phase ##\phi## which is as close as you can get in QM to a classical state.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Discussions: Randomised phase of laser
  1. Laser output (Replies: 12)

  2. Laser photon (Replies: 16)

  3. Laser effect (Replies: 7)