Two-Photon Resonant Third Order Harmonic Generation from Atoms and Ions Interacting with Intense Short Laser Pulses

Abstract:

We investigate the third order harmonic generation for model atoms interacting with intense short laser pulses. We focus on the cases where the ponderomotive energy is not big enough to generate high-order harmonics, and where resonant transitions between bound states are also as important as multi-photon ionization and low-order harmonic generation. We find that the third order harmonic intensity from a model hydrogen atom can decrease as the laser frequency draws near a resonance between bound states. We explain this result by looking into the ionization and Rabi oscillation from the numerical calculation of the time-dependent 1-D Schrödinger equation. In order to support our explanation we also investigate the populations of bound states that play an important role in this atomic process.

• Periodical: Key Engineering Materials (Volumes 277-279)
• Pages: 1049-1053
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.277-279.1049
• Online since: January 2005
• Authors: Young Soon Kim, Jung Seock Choi, Baek Il Nam, Moon Gu Baik, Takako Kato, Izumi Murakami, Richard M. More
• Keywords: High Order Harmonic Generation, Intense Field, Resonant Ionization

References

[1] M. Gavrila: Atoms in Intense Laser Fields (Academic Press, New York. 1992).

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[4] M. -G. Baik, B.I. Nam, and Y.S. Kim: J. Korean Phys. Soc. 36, 275 (2000); B.I. Nam, J. -S. Choi, Y.S. Kim and M. -G. Baik: J. Korean Phys. Soc. 39, 854 (2001); J. -S. Choi, B.I. Nam, Y.S. Kim and M. -G. Baik: J. Chinese Chem. Soc. 48, 545 (2001).

DOI: 10.1002/jccs.200100083

[5] J.H. Eberly, R. Grobe, C. K. Law, and Q. Su: Atoms in Intense Laser Fields, ed. M. Gavrila (Academic Press, New York. 1992), p.301.

[6] Jung-Seock Choi, Baek Il Nam, Young Soon Kim and Moon-Gu Baik: Proceedings of The 11th International Symposium on Laser Spectroscopy, 11, 37 (2003).

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