Werner Kevin, Hastings Michael G, Schweinsberg Aaron, Wilmer Brian L, Austin Drake, Wolfe Christopher M, Kolesik Miroslav, Ensley Trenton R, Vanderhoef Laura, Valenzuela Anthony, Chowdhury Enam
Opt Express. 2019 Feb 4;27(3):2867-2885. doi: 10.1364/OE.27.002867.
Polycrystalline ZnSe is an exciting source of broadband supercontinuum and high-harmonic generation via random quasi phase matching, exhibiting broad transparency in the mid-infrared (0.5-20 μm). In this work, the effects of wavelength, pulse power, intensity, propagation length, and crystallinity on supercontinuum and high harmonic generation are investigated experimentally using ultrafast mid-infrared pulses. Observed harmonic conversion efficiency scales linearly in propagation length, reaching as high as 36%. For the first time to our knowledge, n is measured for mid-infrared wavelengths in ZnSe: n(λ=3.9 μm)=(1.2±0.3)×10 cm/W. Measured n is applied to simulations modeling high-harmonic generation in polycrystalline ZnSe as an effective medium.
多晶ZnSe是一种通过随机准相位匹配产生宽带超连续谱和高次谐波的令人兴奋的光源，在中红外波段（0.5-20μm）具有广泛的透明度。在这项工作中，使用超快中红外脉冲通过实验研究了波长、脉冲功率、强度、传播长度和结晶度对超连续谱和高次谐波产生的影响。观察到的谐波转换效率在传播长度上呈线性比例，高达36%。据我们所知，首次测量了ZnSe中红外波长的n：n（λ=3.9μm）=（1.2±0.3）×10cm/W。将测量得到的n应用于模拟多晶ZnSe作为有效介质中的高次谐波产生。
