Broadband high-power mid-IR femtosecond pulse generation from an ytterbium-doped fiber laser pumped optical parametric amplifier.

Optics letters

PubMedID: 26670509

Hu C, Chen T, Jiang P, Wu B, Su J, Shen Y. Broadband high-power mid-IR femtosecond pulse generation from an ytterbium-doped fiber laser pumped optical parametric amplifier. Opt Lett. 2015;40(24):5774-7.
We report on a high-power periodically poled MgO-doped lithium niobate (MgO:PPLN)-based femtosecond optical parametric amplifier (OPA), featuring a spectral seamless broadband mid-infrared (MIR) output. By modifying the initial chirp and spectrum of the mode-locked seed laser, the Yb fiber pump laser exhibits a final output power of 14 W with sub-200-fs pulse duration after power amplification and compression. When the OPA was seeded with a broadband amplified spontaneous emission (ASE) source, a damage-limited 0. 6 W broadband MIR radiation was experimentally obtained under the pump power of 10. 15 W at 82 MHz repetition rate, corresponding to an overall OPA conversion efficiency of 32. 7%. The 3 dB bandwidth of the mid-IR idler was 291. 9 nm, centering at 3. 34 µm.