双色场驱动下高次谐波的径向量子轨道干涉

研究了双色场驱动下的高次谐波量子轨道的相位匹配特性. 通过调整激光束腰优化双色场空间分布, 可以有效地增加长轨道的径向相位匹配区域, 使得长轨道和短轨道在近轴处和离轴处都同时相位匹配.通过选取合适的近场空间过滤片, 可以获得清晰的径向干涉条纹. 这些结果在分辨不同的干涉现象以及更高精度的观察高阶轨道方面有很大的潜在应用价值. 关键词： 高次谐波 量子轨道 干涉

Quantum path interferences of high-order harmonic generation in two-color Gaussian beams

The phase matching of the quantum paths in high-order harmonic generation is investigated in two-color laser fields. The results show that the spatial distribution of the laser field is optimized by adjusting the laser beam waist, the phase-matching properties of the long trajectories can be modulated effectively, and then good phase matching for both the two paths can be achieved from on-axis region to off-axis region. A radial clear interference fringe induced by the well phase-matching of two paths can be observed by placing a near-field filter, which has great potential for distinguishing clearly different interference effects and observing higher order trajectories with improved detection sensitivity.
Keywords： high-order harmonic generation quantum path interference