We present single-molecule and macroscopic calculations showing that laser-induced Stark shifts contribute significantly to the phase of high-order harmonics from polar molecules. This is important for orbital tomography, where phases of field-free dipole matrix elements are needed in order to reconstruct molecular orbitals. We derive an analytical expression that allows the first-order Stark phase to be subtracted from experimental measurements. © 2012 American Physical Society.
Publication Source (Journal or Book title)
Physical Review A - Atomic, Molecular, and Optical Physics
Etches, A., Gaarde, M., & Madsen, L. (2012). Laser-induced bound-state phases in high-order-harmonic generation. Physical Review A - Atomic, Molecular, and Optical Physics, 86 (2) https://doi.org/10.1103/PhysRevA.86.023818