Highly efficient narrow-line generation by difference-frequency mixing of a green pump and the Stokes seed in RbTiOPO_4 crystals: excitation of 943-nm emission

An efficient and compact scheme for diode-pumped Nd:YLF laser wavelength conversion to 943 nm was demonstrated by use of difference-frequency mixing and stimulated Raman scattering. We believe that this is the highest conversion efficiency from the laser fundamental wavelength reported to date. It is shown that RbTiOPO4 crystals are capable of providing highly efficient frequency mixing as a nonlinear medium.