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Second order correlation function for non ideal laser

  1. Nov 15, 2015 #1
    Hi, it is known that second order correlation function (g2) is a constant( =1) for ideal laser or single frequency light sources. So, what is the second order correlation function for non ideal laser? Is it still a constant or something related to the coherence time of the laser?
  2. jcsd
  3. Nov 20, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
  4. Dec 6, 2015 #3


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    For non-ideal laser the second-order correlation function at zero delay is typically larger than 1 (thermal light would show a value of 2) and decays down towards 1 with increased delaywith a time constant given by the coherence time of the light. The actual shape of the decay towards 1 depends on the reason why the laser is not ideal.
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