
#1
Jan2009, 03:12 AM

P: 15

Hi. I have 2 questions about secondorder coherence g2(t):
1) For collisionbroadened light according to the literature g2(t)=1+g1(t)^2, where g1(t) is the 1st order coherence. Therefore for very low collision rate g1(t) =1 and thus g2(t)=2. However I would expect collision broadened light to reach a costant phase limit of CW for low collision rate and thus g2(t)=1. What did I miss here? 2) In a light emitting diode LED there should be many different scattering mechanisms for the radiating carriers and thus it should behave as a collisionbroadened light g2(0)=2 with superpoissonian photon statistics. On the other hand the literature about LEDs talks about poissonian and even subpoissonian photon statistics dependent only on the electron current and ignoring the scattering. Does anyone have a simple explanation of what should LEDs g2(t) look like and why? 



#2
Jan2009, 03:52 AM

Sci Advisor
P: 1,563




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