【摘要】 实验研究了双色场条件下CO2分子高次谐波辐射,通过改变充气气压获得偶次谐波最大为28th。此外,通过变化气体盒内激光焦点位置从而显著改变24th谐波光子能量。实验发现在气体盒內谐波强度存在两个极大值,这是因为不同区域内相位匹配出现长短轨道选择的结果。实验结果表明,双色场驱动的分子高次谐波可成为具有发展前景的多波长可调谐相干XUV光源。更多还原

【Abstract】 High harmonic generation driven by two-color laser f ield in CO2 molecules were investigated experimentally. The optimized intensity of the 24th harmonic was obtained by changing filling gas pressure. In additional, harmonic output was improved by moving the laser focus with respect to the gas cell. There are two maximum values in two regions. The result is ascribed to different phase matching in the gas cell, favoring long and short electron trajectories during high harmonic generation respectively. The experiment results indicate that molecular high harmonic generated in two-color field may be a promising multi-wavelength tunable coherent XUV source.更多还原