Spectral modulation of third-harmonic generation by molecular alignment and preformed plasma |
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Affiliation: | 1.Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System(Ministry of Education), School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2.State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China |
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Abstract: | We demonstrate spectral modulation of third-harmonic generation from molecular alignment effects. The third harmonic spectrum is broadened or narrowed under different influences of cross-phase modulations originating from various molecular alignment revivals. Furthermore, the spectrum and spatial distribution of the generated third harmonic pulse change dramatically in the presence of a preformed plasma. Under the influence of a preformed plasma, a narrower third harmonic spectrum is observed, and the conical third-harmonic pulse increases while the axial part decreases. The investigation provides an effective method to modulate the spectral characteristic and spatial distribution of third-harmonic generation from intense femtosecond filament. |
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Keywords: | third-harmonic generation laser filament molecular alignment |
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