Abstract.
Second-harmonic generation (SHG) in atmospheric-pressure air is experimentally studied using single focused linear-polarized Ti:sapphire intense femtosecond laser pulses at 810 nm. The efficiency of SHG is found to reach a maximum at the optical breakdown threshold of ≈2.9×1014 W/cm2. The spectral distribution and polarization property of the second harmonic are investigated. The contribution to SHG from electric-field-induced third-order mixing plays the main role even after the optical breakdown had occurred.
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Received: 23 May 2000 / Published online: 16 August 2000
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Qin, YD., Yang, H., Zhu, CJ. et al. Intense femtosecond laser-induced second-harmonic generation in atmospheric-pressure air. Appl Phys B 71, 581–584 (2000). https://doi.org/10.1007/s003400000389
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DOI: https://doi.org/10.1007/s003400000389