We study experimentally how to control and improve phase matching of high-order harmonic generation. We use a birefringent lens and a birefringent compensator to obtain a fundamental laser pulse (150 fs, 800 nm, ∼4 mJ) with two foci separated by 6.2 mm along the propagation axis and with a controllable phase delay between the polarizations along the optic axes of the birefringent optical components. This enables us to enhance the high-order harmonic conversion efficiency for the high-order harmonics in neon to [Formula Presented] a factor of 4 higher compared to a single-focus setup in similar conditions. The enhancement is achieved by improving the phase matching and at the same time maintaining a high intensity in a large generating volume. © 1999 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review A - Atomic, Molecular, and Optical Physics
Roos, L., Constant, E., Mével, E., Balcou, P., Descamps, D., Gaarde, M., Valette, A., Haroutunian, R., & L’Huillier, A. (1999). Controlling phase matching of high-order harmonic generation by manipulating the fundamental field. Physical Review A - Atomic, Molecular, and Optical Physics, 60 (6), 5010-5018. https://doi.org/10.1103/PhysRevA.60.5010