White-light supercontinuum from a femtosecond laser filamentation is essential for many applications due to its broadening spectrum and remote sensing ability. We propose to enhance the supercontinuum intensity by presetting the gaseous lattice in the path of femtosecond laser filamentation. Our results show that the introduction of a gaseous lattice can increase the spectral intensity in both visible and infrared wings, up to about ten times over the no lattice case in a gas medium. We find that the gaseous lattice dramatically affects the time-domain evolutions of the optical intensity and the electron density during the nonlinear propagation of the pulse, thereby resulting in spectral intensity enhancement. The results provide a new way to enhance the supercontinuum generation in the ultra-intense nonlinear process by using a gaseous pre-lattice with a special spatial refractive index profile.

中文翻译：

---

飞秒激光成丝的气态预晶格辅助超连续谱增强

来自飞秒激光灯丝的白光超连续谱由于其拓宽光谱和遥感能力而对许多应用至关重要。我们建议通过在飞秒激光成丝路径中预设气态晶格来增强超连续谱强度。我们的结果表明，气体晶格的引入可以增加可见光和红外翼的光谱强度，比气体介质中无晶格的情况增加约十倍。我们发现气态晶格在脉冲的非线性传播过程中极大地影响了光强和电子密度的时域演化，从而导致光谱强度增强。