Photo-ionization probability of 3+1 resonance enhanced multi-photon process

Guiyin Zhang; Mengjun Li; Yidong Jin

doi:10.1117/12.981861

29 November 2012 Photo-ionization probability of 3+1 resonance enhanced multi-photon process

Guiyin Zhang, Mengjun Li, Yidong Jin

Proceedings Volume 8554, Quantum and Nonlinear Optics II; 855416 (2012) https://doi.org/10.1117/12.981861
Event: Photonics Asia, 2012, Beijing, China

Abstract

Analytic expression of the ionization probability about 3+1 resonance enhanced multi-photon ionization (REMPI) process is deduced with the theory of rate equation, which implies the interaction of photon and material. Based on the expressions, the influence of laser intensity, laser pulse duration and spontaneous radiation lifetime on the ionization probability is analyzed theoretically. It is found that the ionization probability increases with laser intensity and laser pulse duration until gets to saturation. After that, the ionization probability will oscillate around the saturation value if laser intensity increases further. The amplitude of oscillation increases with laser intensity at first, and then it will decrease even get to zero after a maximum peak comes out. We attribute the appearance of the oscillation to the phenomena of quantum coherence caused by the splitting of energy level in strong laser field. As to the fact that the ionization probability becomes to zero with the increase of laser intensity, it indicates that laser intensity is strong enough so as to make the neutral particles getting to the region of ionization suppression. It is also found that the variation of ionization probability with spontaneous radiation lifetime is far smaller than the one with ionization rate. So the influence of the spontaneous radiation lifetime on ionization probability could be ignored.

Citation Download Citation

Guiyin Zhang, Mengjun Li, and Yidong Jin "Photo-ionization probability of 3+1 resonance enhanced multi-photon process", Proc. SPIE 8554, Quantum and Nonlinear Optics II, 855416 (29 November 2012); https://doi.org/10.1117/12.981861

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KEYWORDS

Ionization

Pulsed laser operation

Probability theory

Resonance enhancement

Particles

Atmospheric particles

Multiphoton processes

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