Saturation of resonant third-harmonic generation due to self-defocusing and a redistribution of the population densities

Using a high-power excimer laser, pumped dye laser third-harmonic generation in strontium was investigated around several two-photon resonances for input intensities which are well above the onset of saturation. The dominant role of self-defocusing and of the time-dependent redistribution of the pop...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 1983-12, Vol.19 (12), p.1747-1758
Main Authors: Scheingraber, H., Vidal, C.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Frequency conversion
Fundamental areas of phenomenology (including applications)
Laser excitation
Laser transitions
Nonlinear optics
Nonlinear systems
Optical frequency conversion
Optical harmonic generation
Optics
Physics
Power lasers
Pump lasers
Resonance
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Summary:Using a high-power excimer laser, pumped dye laser third-harmonic generation in strontium was investigated around several two-photon resonances for input intensities which are well above the onset of saturation. The dominant role of self-defocusing and of the time-dependent redistribution of the population densities is demonstrated. Strong stimulated emission on several transitions branching off from the excited state of the two-photon resonance and several competing parametric processes have been observed. Good agreement is obtained with a theoretical model which accounts for the redistribution of the population densities and which shows the importance of the ac Stark effect for the central structure of the high-intensity conversion profiles.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.1983.1071797