Lourés Cristian Redondo, Roger Thomas, Faccio Daniele, Biancalana Fabio
School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, United Kingdom.
Phys Rev Lett. 2017 Jan 27;118(4):043902. doi: 10.1103/PhysRevLett.118.043902.
Solitons propagating in media with higher-order dispersion will shed radiation known as resonant radiation, with applications in frequency broadening, deep UV sources for spectroscopy, and fundamental studies of soliton physics. Using a recently proposed equation that models the behavior of ultrashort optical pulses in nonlinear media using the analytic signal, we find that the resonant radiation associated with the third-harmonic generation term of the equation is parametrically stimulated with an unprecedented gain. Resonant radiation levels, typically only a small fraction of the soliton, are now as intense as the soliton itself. The mechanism is universal and works also in normal dispersion and with harmonics higher than the third. We report experimental hints of this superresonant radiation stimulated by the fifth harmonic in diamond.
在具有高阶色散的介质中传播的孤子会释放出称为共振辐射的辐射，其应用于频率展宽、光谱学的深紫外光源以及孤子物理的基础研究。使用最近提出的一个方程，该方程利用解析信号对非线性介质中超短光脉冲的行为进行建模，我们发现与该方程三次谐波产生项相关的共振辐射受到参量激发，增益前所未有的高。共振辐射水平通常仅为孤子的一小部分，现在却与孤子本身一样强烈。该机制具有普遍性，在正常色散以及高于三次谐波的情况下也有效。我们报告了在金刚石中由五次谐波激发这种超共振辐射的实验迹象。
