orbital angular momentum

Wang B., M. Tanksalvala, Z. Zhang, Y. Esashi, N.W. Jenkins, M. Murnane, H. Kapteyn, and C.-T. Liao, Metrology, Inspection, And Process Control For Semiconductor Manufacturing Xxxv 11611, 76-90 (2021).
Esashi Y., C.-T. Liao, B. Wang, N. Brooks, K.M. Dorney, C. Hernández-García, H. Kapteyn, D. Adams, and M. Murnane, Optics Express 26, 34007-34015 (2018).