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Forum: Processes Involving Optical Photons
Re: Question Angular distribution of photons
Re: Feedback Re: Angular distribution of photons (Gumplinger Peter)
Date: 24 Oct, 2014
From: <Frank>

The momentum direction in z has also ups and downs (see attached figure) like the angular distribution.

The setup is the following: Crystal/Mat1/Mat2/Photodetector. Gammas are shoot with z-direction -1 into a crystal which emits optical photons. The optical photons would therefore follow an isotropic distribution at birth.

Between the crystal and the photodetector, there are two intermediate materials (dielectric). I look at the z-momentum direction of photons coming from Mat2 that hit the surface of the photodetector.

Mat1 has n=1.47 and Mat2 has n=2 so the maximum refraction angle of a photon crossing Mat1/Mat2 interface is ~47deg. Hence, the maximum arrival angle on the photodetector is 47deg which we observe on the angular distribution.

Best regards

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/10/24/06.14-52955-HitDirectionZ.png

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