Abstract

High repetition rate femtosecond filaments in transparent solids produce conical third harmonic generation due to filament-induced material reorganization in the form of periodic volume nanogratings. Here we report on conical third harmonic generation that accompanies supercontinuum generation in fused silica using broadly tunable femtosecond pulses. The measurement of third harmonic cone angles with driving wavelengths in the 1–3-$\mathrm{\mu}$m range fully supports the noncollinear phase-matching scenario that involves a reciprocal lattice vector of the filament-inscribed nanograting. The nanograting provides an octave-spanning phase-matching bandwidth, as attested by the measurements of the angle-resolved spectra of broadband conical third harmonic emission.

© 2023 Optica Publishing Group

Multiple conical odd harmonics from filament-inscribed nanogratings

Robertas Grigutis, Vytautas Jukna, Gintaras Tamošauskas, and Audrius Dubietis
Photon. Res. 11(11) 1814-1819 (2023)

Conical third harmonic generation from volume nanogratings induced by filamentation of femtosecond pulses in transparent bulk materials

Robertas Grigutis, Vytautas Jukna, Marius Navickas, Gintaras Tamošauskas, Kestutis Staliunas, and Audrius Dubietis
Opt. Express 29(24) 40633-40642 (2021)

Low-threshold supercontinuum generation in a homogeneous bulk material at 76 MHz pulse repetition rate

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Opt. Lett. 48(17) 4609-4612 (2023)

Gradient enhanced third harmonic generation in a femtosecond filament

Emilia Schulz, Daniel S. Steingrube, Tobias Vockerodt, Thomas Binhammer, Uwe Morgner, and Milutin Kovačev
Opt. Lett. 36(22) 4389-4391 (2011)

Third-harmonic generation and scattering in combustion flames using a femtosecond laser filament

Hong-Wei Zang, He-Long Li, Yue Su, Yao Fu, Meng-Yao Hou, Andrius Baltuška, Kaoru Yamanouchi, and Huailiang Xu
Opt. Lett. 43(3) 615-618 (2018)