Abstract

We extend all-optical quasi-phase matching of high-order harmonic generation into spectral regions where conventional phase matching is not possible. The high laser intensities required to generate harmonics at energy $>130\mathrm{eV}$, coupled with the resulting high level of ionization, preclude conventional phase matching in all nonlinear media. Selective enhancement factors between 40 and 150 in the flux of harmonics at photon energies around $140\mathrm{eV}$ are demonstrated using a train of two counterpropagating pulses.

© 2008 Optical Society of America

Quasi-phase matching and characterization of high-order harmonic generation in hollow waveguides using counterpropagating light

Amy L. Lytle, Xiaoshi Zhang, Richard L. Sandberg, Oren Cohen, Henry C. Kapteyn, and Margaret M. Murnane
Opt. Express 16(9) 6544-6566 (2008)

Optimizing quasi-phase matching of high harmonic generation using counterpropagating pulse trains

Oren Cohen, Amy L. Lytle, Xiaoshi Zhang, Margaret M. Murnane, and Henry C. Kapteyn
Opt. Lett. 32(20) 2975-2977 (2007)

Phase matching, quasi-phase matching, and pulse compression in a single waveguide for enhanced high-harmonic generation

Xiaoshi Zhang, Amy Lytle, Tenio Popmintchev, Ariel Paul, Nick Wagner, Margaret Murnane, Henry Kapteyn, and Ivan P. Christov
Opt. Lett. 30(15) 1971-1973 (2005)

Quasi-periodic and random quasi-phase matching of high harmonic generation

Alon Bahabad, Oren Cohen, Margaret M. Murnane, and Henry C. Kapteyn
Opt. Lett. 33(17) 1936-1938 (2008)

Extended phase matching of high harmonics driven by mid-infrared light

Tenio Popmintchev, Ming-Chang Chen, Oren Cohen, Michael E. Grisham, Jorge J. Rocca, Margaret M. Murnane, and Henry C. Kapteyn
Opt. Lett. 33(18) 2128-2130 (2008)