Xie Xuejiao, Yu Shujuan, Li Weiyan, Wang Shang, Chen Yanjun
Opt Express. 2018 Jul 9;26(14):18578-18596. doi: 10.1364/OE.26.018578.
We study odd-even high-harmonic generation (HHG) from oriented asymmetric molecules with different symmetries in strong laser fields. A model based on strong-field approximations is used which allows us to resolve the contributions of different emission routes to odd-even HHG. The comparison between the HHG yields of all routes versus one certain route demonstrates that the routes in which the electron ionizes from the gerade component of the asymmetric orbital contribute mainly to odd-even HHG. We show that the potential mechanism is associated with effects of intramolecular interference in tunneling ionization as the bound electron passes through the barrier formed by the laser field and the asymmetric Coulomb potential. The influences of different emission routes on asymmetric orbital imagining with odd-even HHG are also addressed.
我们研究了强激光场中具有不同对称性的取向不对称分子的奇偶高次谐波产生（HHG）。使用了一个基于强场近似的模型，这使我们能够分辨不同发射路径对奇偶HHG的贡献。所有路径与某一特定路径的HHG产率比较表明，电子从不对称轨道的 gerade 分量电离的路径对奇偶HHG贡献主要。我们表明，潜在机制与隧穿电离中的分子内干涉效应有关，因为束缚电子穿过由激光场和不对称库仑势形成的势垒。还讨论了不同发射路径对奇偶HHG不对称轨道成像的影响。
