Diouf Mbaye, Salem Amine Ben, Cherif Rim, Saghaei Hamed, Wague Ahmadou
Appl Opt. 2017 Jan 10;56(2):163-169. doi: 10.1364/AO.56.000163.
We numerically report super-flat coherent mid-infrared supercontinuum (MIR-SC) generation in a chalcogenide AsSe photonic crystal fiber (PCF). The dispersion and nonlinear parameters of AsSe chalcogenide PCFs by varying the diameter of the air holes are engineered to obtain all-normal dispersion (ANDi) with high nonlinearities. We show that launching low-energy 50 fs optical pulses with 0.88 kW peak power (corresponding to pulse energy of 0.05 nJ) at a central wavelength of 3.7 μm into a 5 cm long ANDi-PCF generates a flat-top coherent MIR-SC spanning from 2900 to 4575 nm with a high spectral flatness of 3 dB. This ultra-wide and flattened spectrum has excellent stability and coherence properties that can be used for MIR applications such as medical diagnosis of diseases, atmospheric pollution monitoring, and drug detection.
我们通过数值方法报道了在硫系砷硒光子晶体光纤（PCF）中产生超平坦相干中红外超连续谱（MIR-SC）的情况。通过改变气孔直径来设计硫系砷硒PCF的色散和非线性参数，以获得具有高非线性的全正色散（ANDi）。我们表明，在中心波长为3.7μm时，将峰值功率为0.88kW（对应脉冲能量为0.05nJ）的低能量50fs光脉冲注入到5cm长的ANDi-PCF中，会产生一个平顶相干MIR-SC，其范围从2900到4575nm，光谱平坦度高达3dB。这种超宽且平坦的光谱具有出色的稳定性和相干特性，可用于诸如疾病医学诊断、大气污染监测和药物检测等中红外应用。
