Simultaneous stimulated Raman scattering and second harmonic generation in periodically poled lithium niobate

Simultaneous stimulated Raman scattering (SRS) and second harmonic generation (SHG) are demonstrated in periodically poled lithium niobate (PPLN). Using a simple single-pass geometry, conversion efficiencies of up to 12% and 19% were observed for the SRS and SHG processes respectively. By changing the PPLN period interacting with the photonic crystal fibre based pump source and varying the PPLN temperature, the SHG signal was measured to be tunable from λ=584 nm to λ=679 nm. The SRS output spectrum was measured at λ=1583 nm, with a spectral full-width at half-maximum of λ=85 nm.