The inset exhibits (in linear scale) the spectrum that corresponds to PP0 ¼ PCR ¼ 6:693 W. With
these values gR ¼ 2:1 W1
km1.
We choose to PF0 as the minimum value of the Stokes signal or the maximum value of the
spontaneous Raman scattering. Note that in the inset of Fig. 2, the growth of the Stokes signal
occurs at 1115 nm. At 2.9 W exhibits the lowest level of RS, and the signal is evident in 3.3 W.
At discrete pump levels the spectrum was recorded and the output power measured. The power
of each signal was estimated by comparing the area under the curve of each component with
respect to the total area of the spectrum. Curves constructed with these data show the evolution of
the power transferred to the first Stokes (see Fig. 3). The inset is the Raman threshold that
corresponds to the intersection of the residual pump and Stokes signal. Note that this happens at
6.693 W.