1. High Harmonic Generation in Ionization of Magnetically Dressed Atoms
APS Centennial Meeting Atlanta 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

2. National Science Foundation
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 Ionizationw3 w2 wL wL w1
? ? ?
I(w) wL w

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

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

13. 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.

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

15. Analytically Soluble Model
— exact

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

20. 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)