High harmonic radiation spectra up to 19th order in alkali metal vapors excited by an intense, picosecond mid-infrared (3-4 μm) laser are reported and compared to theory. The strong-field dynamics in the alkali metal atoms exhibit significant differences from all previously studied systems due to the strong coupling between their ground and first excited states. © 1999 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review Letters
Sheehy, B., Martin, J., Di Mauro, L., Agostini, P., Schafer, K., Gaarde, M., & Kulander, K. (1999). High harmonic generation at long wavelengths. Physical Review Letters, 83 (25), 5270-5273. https://doi.org/10.1103/PhysRevLett.83.5270