X-Rays with Spin and Orbital Angular Momentum
X-rays with Spin and Orbital Angular Momentum for Ultrafast Studies of Quantum Materials
3. Quantum Design Concept
By using polarization and frequency mixing to create a complex bi-color mid-infrared driving laser field, the extreme nonlinear optical process of high harmonic generation upconverts light in the X-ray regime. Remarkably, this upconversion also transfers the angular momentum properties of the driving light into the newly generated light through exquisite attosecond control of electron wavefunctions.
Generation of bright phase-matched circularly-polarized extreme ultraviolet high harmonics
O. Kfir, P. Grychtol, E. Turgut, R. Knut, D. Zusin, D. Popmintchev, T. Popmintchev, H. Nembach, J. M. Shaw, A. Fleischer, H. Kapteyn, M. Murnane, O. Cohen, Nat. Photonics 9, 99-105 (2015).http://dx.doi.org/10.1038/nphoton.2014.293
Bright circularly polarized soft X-ray high harmonics for X-ray magnetic circular dichroism
T. T. Fan, P. Grychtol, R. Knut, C. Hernandez-Garcia, D. D. Hickstein, D. Zusin, C. Gentry, F. J. Dollar, C. A. Mancuso, C. W. Hogle, O. Kfir, D. Legut, K. Carva, J. L. Ellis, K. M. Dorney, C. Chen, O. G. Shpyrko, E. E. Fullerton, O. Cohen, P. M. Oppeneer, D. B. Milosevic, A. Becker, A. A. Jaron-Becker, T. Popmintchev, M. M. Murnane, H. C. Kapteyn, Proceedings of the National Academy of Sciences of the United States of America 112, 14206-14211 (2015). https://doi.org/10.1073/pnas.1519666112