Mid-infrared ultrafast laser pulses induced third harmonic generation in nitrogen molecules on an excited state.
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ABSTRACT: We report on generation of third harmonic from nitrogen molecules on the excited state with a weak driver laser pulse at a mid-infrared wavelength. The excited nitrogen molecules are generated using a circularly polarized intense femtosecond pulse which produces energetic electrons by photoionization to realize collisional excitation of nitrogen molecules. Furthermore, since the third harmonic is generated using a pump-probe scheme, it enables investigation of the excited-state dynamics of nitrogen molecules produced under different conditions. We also perform a comparative investigation in excited argon atoms, revealing different decay dynamics of the molecules and atoms from the excited states in femtosecond laser induced filaments.
SUBMITTER: Xie H
PROVIDER: S-EPMC4629167 | biostudies-other | 2015
REPOSITORIES: biostudies-other
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