Hu Hongyu, Zhang Xiang, Li Wenbo, Dutta Niloy K
Appl Opt. 2015 Apr 10;54(11):3448-54. doi: 10.1364/AO.54.003448.
A dispersion-varying tapered planar waveguide is designed to generate supercontinuum efficiently in the mid-infrared region. The rib waveguide of lead-silicate glass on silica is 1.8 cm long, consisting of a segment with longitudinally increasing etch depth. The mechanism involves nonlinear soliton dynamics. The dispersion profile is shifted along the propagation distance, leading to continuous modification of the phase-matching condition for dispersive wave (DW) emission and enhancement of energy transfer efficiency between solitons and DWs. With low input pulse energy of 45 pJ, simulation demonstrates the generation of both broadband and flat near-octave spectrum spanning 1.3-2.5 μm at the -20 dB level.
设计了一种色散可变的锥形平面波导，以在中红外区域高效产生超连续谱。二氧化硅上的铅硅酸盐玻璃肋形波导长1.8厘米，由蚀刻深度沿纵向增加的一段组成。其机制涉及非线性孤子动力学。色散分布沿传播距离移动，导致色散波（DW）发射的相位匹配条件不断变化，并提高了孤子与DW之间的能量转移效率。在45 pJ的低输入脉冲能量下，模拟表明在-20 dB水平上产生了跨越1.3-2.5μm的宽带且平坦的近倍频程光谱。
