Two-photon induced stimulated Raman scattering in cesium vapor

Two-photon induced stimulated Raman scattering has been observed for the first time. The observations have been made in cesium vapor. In the process cesium atoms are excited from the 6S_{$\text{3}\text{2}$} ground state to the 6P_{$\text{3}\text{2}$} excited state through the absorption of two laser photons at 1.064 μm and the emission of one scattered photon at 1.416 μm. The spectrum of the scattered light reveals the optical Stark shifts of the initial and final levels.