|Message: Re: Explanation for the number of optical photons detected in an apd||Not Logged In (login)|
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The explanation for most of what you describe is this, for ss=1 and sl=1 plus sa=0 (same as ss=1), the rays keep their respective relative direction with respect to the surfaces; e.g. they either escape on the first encounter or bounce around until they hit your detector. However, when sl=1 and sa>0, their directions change randomly. Now, rays that would have otherwise been bouncing around (continued total internal reflection) can now escape your crystal (for ground surface). For groundbackpainted the situation is similar, rays that would have been total internal reflected on the crystal/gap can now enter the gap, reach your back-reflector which you might have specified to have a finite reflectivity and hence get lost.