We aim to develop techniques for controlling one- and three-dimensional molecular orientation in the completely field-free condition. To that end, we need an all-optical technique. Actually, the proof-of-principle experiment of all-optical molecular orientation has already been demonstrated [1].  The technique is based on the combined effects of the anisotropic hyperpolarizability interaction as well as the anisotropic polarizability interaction with an intense nonresonant two-color laser field [2]. We aim to achieve both one- and three-dimensional molecular orientation. One-dimensional molecular orientation can be achieved with the polarizations of the two wavelengths parallel to each other, while three-dimensional molecular orientation can be achieved with the polarizations of the two wavelengths crossed.

[1]     Keita Oda, Masafumi Hita, Shinichirou Minemoto, and Hirofumi Sakai, “All-optical molecular orientation,” Phys. Rev. Lett. 104, 213901 (2010).

[2]     Tsuneto Kanai and Hirofumi Sakai, “Numerical simulations of molecular orientation using strong, nonresonant, two-color laser fields,” J. Chem. Phys. 115, 5492 (2001).