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High Harmonic Generation in Ionization of Magnetically Dressed Atoms

APS Centennial Meeting Atlanta 1999 DAMOP Undergraduate Research Symposium. High Harmonic Generation in Ionization of Magnetically Dressed Atoms. Robert E. Wagner Freshman Intense Laser Physics Theory Unit Illinois State University. www.phy.ilstu.edu/ILP. Acknowledgment.

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High Harmonic Generation in Ionization of Magnetically Dressed Atoms

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  1. APS Centennial Meeting Atlanta 1999 DAMOP Undergraduate Research Symposium High Harmonic Generation in Ionization of Magnetically Dressed Atoms Robert E. Wagner Freshman Intense Laser Physics Theory Unit Illinois State University www.phy.ilstu.edu/ILP

  2. Acknowledgment • Undergrad researchers: P. Peverly, electron dynamics J. Braun, quantum simulations J. Csesznegi, graphics T. Shepherd, animations • Advisors: Profs. Q. Su, R. Grobe • Support: National Science Foundation Research Corporation ISU Honor’s Program

  3. Scattered Light Spectra in Ionization w3 w2 wL wL w1 ? ? ? I(w) w wL

  4. Relativistic Newton Equations • RK-4 variable step size simulation • Spectra of scattered light

  5. Non-relativistic regime: E < 1 a.u.  = L L + M a (L + M = odd)  = L L (L = odd) Shifted atomic lines Laser Intensity w = wL Rapid ionization

  6. Relativistic regime: E > 1 a.u.  = L L (L = even + odd) Laser Intensity Relativistic redshift

  7. Magnetically dressed atoms Perturbative regime: E < 0.1 a.u. Non-rel. strong field: 0.1 < E < 1.0 a.u. Laser Intensity Relativistic magnetic resonances: E > 1.0 a.u.

  8. Non-rel. Perturbative Regime: E < 0.1 (3,1,1) w = L wL + M w+ + N w- (L + M + N = odd) W = Cyclotron frequency

  9. Analytically Soluble Model + analytical — exact

  10. Relativistic Magnetic Resonances Typical Orbit Maximum displacement How do the spectra evolve as a function of W?

  11. Summary -W=0 -> main features understood - Analytical model -> retardation effects in spectra - Novel rel. resonances enhance higher harmonics - Challenges ahead: coherence, quantum aspects... R. E. Wagner, Q. Su and R. Grobe, Phys. Rev. A (submitted) www.phy.ilstu.edu/ILP

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