Broadband tunable Raman soliton self-frequency shift to mid-infrared band in a highly birefringent microstructure fiber

Wang Wei^{1, 2, †,}, Bi Xin-Ying^{1, 2}, Wang Jun-Qi^{1, 2}, Qu Yu-Wei^{1, 2}, Han Ying^{1, 2}, Zhou Gui-Yao^{1, 2}, Qi Yue-Feng^{1, 2}

Output spectrum with pump of 810 nm polarized along (a) slow axis, (b) fast axis, and (c) θ = 45° for different pump powers. In panel (c), peak I denotes the furthest red-shift Raman soliton in fast axis, and peak II denotes the furthest red-shift Raman soliton in slow axis.