Realization of an O-waveband laser based on cascaded stimulated Raman scattering of microspheres

We report an experimental realization of five-order Stokes stimulated Raman scattering lasing in silica microspheres pumped by a 1030 nm continuous-wave laser. The wavelength of the Stokes Raman laser is extended to 1348.55 nm, which is located in the second low loss window of the optical fiber. It has potential applications in the wavelength converter and Raman amplifier in O-waveband optical communication. The minimum pump power is about 50 μW when the first-order Stokes Raman laser can be observed.