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Emission spectra of Raman lasing obtained in the same silica microtoroid resonator at different bands of the spectrum covering visible to near-IR. The pump lasers are in (A) 660-nm, (B) 980-nm, (C) 1,450-nm, and (D) 1,550-nm bands. Higher-order cascaded Raman Stokes lasing is clearly seen in all of the spectra. (Insets) The single-mode operation of the Raman lasers obtained by tuning the pump power and the coupling condition.
