@article{4046, author = {Jennifer Ellis and Kevin Dorney and Charles Durfee and Carlos Hernández-García and Franklin Dollar and Christopher Mancuso and Tingting Fan and Dmitriy Zusin and Christian Gentry and Patrik Grychtol and Henry Kapteyn and Margaret Murnane and Daniel Hickstein}, title = {Phase matching of noncollinear sum and difference frequency high harmonic generation above and below the critical ionization level}, year = {2017}, journal = {Optics Express}, volume = {25}, pages = {10126}, month = {2017-01}, url = {https://www.osapublishing.org/abstract.cfm?URI=oe-25-9-10126}, doi = {10.1364/OE.25.010126}, }