Investigation of hydrogen atom radiation under the action of ti:sapphire laser
V.L. Derbov, V.V .Serov, N.I. Teper

Saratov State University,
Saratov State Socio-Economic University

Full text of article: Russian language..

Abstract:
We present the results of numerical modelling of population dynamics in a hydrogen atom under the action of Ti:sapphire laser pulse. The possibility of formation of wave packets, including the states with high values of orbital and magnetic quantum numbers, via multiple transitions between the states of discrete and continuous spectrum under the action of the laser field is investigated. Ionization losses are taken into account by using a realistic model of the continuum. Partial localization of electron density in radial and angular variables is demonstrated. On the basis of direct solution of Schrödinger equation spectral characteristics of atom radiation during laser excitation for estimation of Rydberg wave packet as source of generation in a terahertz range.

Key words: Rydberg states, wave packet, numerical simulation, ultra-short laser pulse, Ti:sapphire laser.

References:

  1. Shapiro, .. Non-circular Trojan-like wavepackets: quantum theory and application to quantum control / .. Shapiro, M. Kalinski, J.H. Eberly // J. Phys. B. –2000. – Vol. 33. – P. 3079-3091.
  2. Kochanski, P. Squeezing of electromagnetic field in a cavity by electrons in Trojan states / P. Kochanski, Z. Bialynicka-Birula, I. Bialynicki-Birula // Phys. Rev. A. – 2001. – Vol. 63. – P. 013811.
  3. Schafer, K.J. Tunable terahertz radiation from Stark wave packets / K.J. Schafer, J.L. Krause // Optics Express. – 1997. – Vol. 1, N 7. – P. 210-215.
  4. Schafer, K.J. Control of THz Emission from Stark Wave Packets / K.J. Schafer, J.L. Krause // J. Phys. Chem. A. – 1999. – Vol. 103. – P. 10118-10125.
  5. Gaeta, Z.D. Classical and quantum-mechanical dynamics of quasiclassical state of the hydrogen atom / Z.D. Gaeta, C.R. Stroud // Phys. Rev. A. – 1990. – Vol. 42, N 11. – P. 6308-6313.
  6. Gaeta, Z.D. Excitation of the classical-limit state of an atom / Z.D. Gaeta, M.W. Noel, C.R. Stroud // Phys. Rev. Lett. – 1994. – Vol. 73, N 5. – P. 636-639.
  7. Bromage, J. Excitation of a Three-Dimensionally Localized Atomic Electron Wave Packet / J. Bromage, C.R. Stro­ud // Phys. Rev. Lett. – 1999. – Vol. 83, N 24. – P. 4963-4966.
  8. Alber, G. Generation and detection of Rydberg wave packets by short laser pulses / G. Alber, H. Ritsch, P. Zoller // Phys. Rev. A. – 1986. – Vol. 34, N 2. – P. 1058-1064.
  9. Parker, J. Coherence and Decay of Rydberg Wave Packets / J. Parker, C.R. Strong // Phys. Rev. Lett. – 1986. – Vol. 56, N 7. – P. 716-719.
  10. Wolde, A. Observation of Radially Localized Atomic Electron Wave Packets / A. Wolde, L.D. Noordam, A. Lagendijk, H.B. van Linden van den Heuvell // Phys. Rev. Lett. – 1988. – Vol. 61, N 18. – P. 2099-2101.
  11. Nilsen, H.M. Generation of an angular and radial Rydberg wave packet in a single laser pulse / H.M. Nilsen, J.P. Hansen // Phys. Rev. A. – 2000. – Vol. 63. – P. 011405.
  12. Madsen, L.B. Procedures for the evaluation of atomic transition matrix elements in the interaction with laser light / L.B. Madsen, J.P. Hansen, H.M. Nilsen // Comput. Phys. Commun. – 1999. – Vol. 120. – P. 231-237.
  13. Teper, N.I. Population dynamics in a hydrogen atom under the action of ultra-short pulse of laser radiation / N.I. Teper, V.L. Derbov // Izvestia vuz. Applied Nonlinear Dynamics. – 2008. – Vol. 16, N 1. – P. 115-123. – (in Russian).
  14. Wang, H. Generation of 10-W average-power, 40-TW peak-power, 24-fs pulses from a Ti:sapphire amplifier system / H. Wang, S. Backus, Z. Chang, R. Wagner, K. Kim, X. Wang, D. Umstadter, T. Lei, M. Murnane, H. Kapteyn // J. Opt. Soc. Am. B. – 1999. – Vol. 16, N 10. – P. 1790-1794.
  15. Derbov, V.L. Forming of Rydberg wave packet under the action of the pulse of Ti:sapphire laser / V.L. Derbov, N.I. Teper // Proceeding of SPIE. – 2009. – Vol. 7501. – P. 75010I.
  16. Derbov, V.L. Forming of localized wave packets in a hydrogen atom under the action of ultra-short laser pulses / V.L. Derbov, N.I. Teper // Optical Physics and Biophotonics: Proceedings of 13th Annual International School for Young Scientist and Student on Optics, Laser Physics & Biophotonics. – Saratov: Novyi Veter Press, 2009. – P. 121-125. – (in Russian).

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