Zhao, Yi-TingMa, Shu-yanJiang, Shi-ChengYang, Yu-JunZhao, XiChen, Ji-Gen2023-12-072023-12-072019-11-11https://hdl.handle.net/2097/44048Band structure and transition dipole moment play important roles in high-order harmonic generation from solid materials. In this work we provide a new all-optical technique to reconstruct the momentum-dependent transition dipole moment using the harmonic spectrum from MgO crystal driven by an ultrashort mid-infrared laser pulse. Under the influence of the ultrashort laser pulse, the emitted photon energy and the crystal momentum form a one-to-one match, in the same way between the intensity of the harmonic above the minimum bandgap and the square of the amplitude of the transition dipole moment, resulting in a realization of directly probing the transition dipole moment. Our all-optical method paves a way to image the two-dimensional transition dipole moment of crystals with the inversion symmetry.Optica Publishing Group Open Access Publishing Agreementhttps://opg.optica.org/submit/review/pdf/CopyrightTransferOpenAccessAgreement-2021-09-20.pdfText