Electric-field-induced second-harmonic generation using high-intensity femtosecond laser pulses over the observable optical breakdown threshold

We investigated the performance of electric-field-induced second-harmonic generation (E-FISHG) by spectroscopic measurement using high-intensity femtosecond laser pulses. The second-harmonic intensity increased quadratically versus the applied electric field, as expected from the theory, up to 15 kV...

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Bibliographic Details
Published in:Optics letters 2021-01, Vol.46 (2), p.238-241
Main Authors: Fujii, Takashi, Sato, Masahiro, Nakamura, Shin, Kumada, Akiko, Miki, Megumu, Oishi, Yuji
Format: Article
Language:English
Subjects:
Breakdown
Electric fields
Femtosecond pulses
High power lasers
Lasers
Phase modulation
Second harmonic generation
Spectroscopic analysis
White light
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Summary:We investigated the performance of electric-field-induced second-harmonic generation (E-FISHG) by spectroscopic measurement using high-intensity femtosecond laser pulses. The second-harmonic intensity increased quadratically versus the applied electric field, as expected from the theory, up to 15 kV/cm with the laser energy up to 2.5 mJ, which is ∼5 times higher than the observable optical breakdown threshold. In addition, when the laser energy was 2.8 mJ, ∼80 times signal intensity at 0.23 mJ was obtained. These results suggest that the electric-field measurement by E-FISHG with high-intensity second harmonics is expected by using high-intensity laser pulses above the observable optical breakdown threshold. Spectroscopic measurement shows no E-FISHG of white light generated by self-phase modulation in laser-induced filament.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.412856