Stronger orientation of state-selected OCS molecules with relative-delay-adjusted nanosecond two-color laser pulses

Md Maruf Hossain; Xiang Zhang; Shinichirou Minemoto; Hirofumi Sakai

doi:10.1063/5.0075849

Stronger orientation of state-selected OCS molecules with relative-delay-adjusted nanosecond two-color laser pulses

J Chem Phys. 2022 Jan 28;156(4):041101. doi: 10.1063/5.0075849.

Authors

Md Maruf Hossain¹, Xiang Zhang¹, Shinichirou Minemoto¹, Hirofumi Sakai¹

Affiliation

¹ Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

PMID: 35105105
DOI: 10.1063/5.0075849

Abstract

Using the all-optical molecular orientation technique with intense nonresonant two-color laser pulses, stronger molecular orientation |⟨cos θ_2D⟩| ∼ 0.34 is achieved by employing the following two strategies: (1) carbonyl sulfide molecules lying in the lower rotational states are selected using a home-built molecular deflector and (2) the rising parts of the two wavelengths of the pump pulse are adjusted by introducing a Michelson-type delay line in the optical path. The achieved degree of molecular orientation is higher than that observed in the proof-of-principle experiment [Oda et al., Phys. Rev. Lett. 104, 213901 (2010)] by about an order of magnitude and the highest ever characterized directly by Coulomb explosion imaging with appropriate probe polarization.