Cascaded OPG based on BaGa4Se7 to broadband continuum generation in mid-IR range

This work is devoted to the development of a broadband continuous spectrum source in the mid-IR range. This source is based on a cascaded picosecond optical parametric generation (OPG) in a BaGa4Se7 (BGSe) crystal. The first cascade is a PPLN optical parametric amplifier (OPA) tunable in the range of $1.7-2\ \ \mu \mathrm{m}$ with tunable injection seeding by PPLN optical parametric oscillator (OPO). Such sources are in demand for many applications including atmosphere and medical gas analysis.