Phase shift formula in stimulated Brillouin scattering

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eahaidar
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Good morning
I need to ask about the exact formula for the phase shift used in stimulated Brillouin scattering especially in the phase shifter thank you
 

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What have you already found? This is a pretty broad topic.
 
UltrafastPED said:
What have you already found? This is a pretty broad topic.
What I know is usually the imaginary part of the complex gain but I really want to know that there is a coefficient other than go which is power over effective area
I need to know if also the effective length is also multiplied to this constant
 
What I know from any book that you derive from the complex gain the real and imaginary part
The imaginary part is related to the phase but I need to know what factors multipled to this imaginary part??