dorsal/arxiv
View SchemaPhotoionization Suppression by Continuum Coherence: Experiment and Theory
| Authors | L. P. Yatsenko, T. Halfmann, B. W. Shore, K. Bergmann |
|---|---|
| Categories | |
| ArXiv ID | physics/9901017 |
| URL | https://arxiv.org/abs/physics/9901017 |
| DOI | 10.1103/PhysRevA.59.2926 |
Abstract
We present experimental and theoretical results of a detailed study of laser-induced continuum structures (LICS) in the photoionization continuum of helium out of the metastable state 2s $^1S_0$. The continuum dressing with a 1064 nm laser, couples the same region of the continuum to the {4s $^1S_0$} state. The experimental data, presented for a range of intensities, show pronounced ionization suppression (by as much as 70% with respect to the far-from-resonance value) as well as enhancement, in a Beutler-Fano resonance profile. This ionization suppression is a clear indication of population trapping mediated by coupling to a contiuum. We present experimental results demonstrating the effect of pulse delay upon the LICS, and for the behavior of LICS for both weak and strong probe pulses. Simulations based upon numerical solution of the Schr\"{o}dinger equation model the experimental results. The atomic parameters (Rabi frequencies and Stark shifts) are calculated using a simple model-potential method for the computation of the needed wavefunctions. The simulations of the LICS profiles are in excellent agreement with experiment. We also present an analytic formulation of pulsed LICS. We show that in the case of a probe pulse shorter than the dressing one the LICS profile is the convolution of the power spectra of the probe pulse with the usual Fano profile of stationary LICS. We discuss some consequences of deviation from steady-state theory.
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"abstract": "We present experimental and theoretical results of a detailed study of\nlaser-induced continuum structures (LICS) in the photoionization continuum of\nhelium out of the metastable state 2s $^1S_0$. The continuum dressing with a\n1064 nm laser, couples the same region of the continuum to the {4s $^1S_0$}\nstate. The experimental data, presented for a range of intensities, show\npronounced ionization suppression (by as much as 70% with respect to the\nfar-from-resonance value) as well as enhancement, in a Beutler-Fano resonance\nprofile. This ionization suppression is a clear indication of population\ntrapping mediated by coupling to a contiuum. We present experimental results\ndemonstrating the effect of pulse delay upon the LICS, and for the behavior of\nLICS for both weak and strong probe pulses. Simulations based upon numerical\nsolution of the Schr\\\"{o}dinger equation model the experimental results. The\natomic parameters (Rabi frequencies and Stark shifts) are calculated using a\nsimple model-potential method for the computation of the needed wavefunctions.\nThe simulations of the LICS profiles are in excellent agreement with\nexperiment. We also present an analytic formulation of pulsed LICS. We show\nthat in the case of a probe pulse shorter than the dressing one the LICS\nprofile is the convolution of the power spectra of the probe pulse with the\nusual Fano profile of stationary LICS. We discuss some consequences of\ndeviation from steady-state theory.",
"arxiv_id": "physics/9901017",
"authors": [
"L. P. Yatsenko",
"T. Halfmann",
"B. W. Shore",
"K. Bergmann"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.59.2926",
"title": "Photoionization Suppression by Continuum Coherence: Experiment and Theory",
"url": "https://arxiv.org/abs/physics/9901017"
},
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