| http://www.w3.org/ns/prov#value | - The TIR condition at the coupler's reflecting surface is given by: ?? inc > arcsin ??? ??? ( 1 n coupler ) ( 1 ) where ??inc is the angle of incidence of the pump light with respect to the reflecting surface, e.g. the angle measured from the normal to the reflecting surface to principal ray of the incident light, ncoupler is the refractive index of the coupler and the surrounding media is air.
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