Abstract
Supercontinuum generation from nanojoule femtosecond lasers is well known in photonic-crystal fibers, channel waveguides, and micro-resonators, in which strong confinement shapes their dispersion and provides sufficient intensity for self-phase modulation, four-wave mixing, and Raman scattering to cause substantial spectral broadening. Until now, supercontinuum generation in bulk media has not been observed at equivalent energies, but here we introduce a new mechanism combining second- and third-order nonlinearities to produce broadband visible light in orientation-patterned gallium phosphide. A supercontinuum from the blue/green to the red is produced from 32 nJ 1040 nm femtosecond pulses, and a nonlinear-envelope-equation model including χ (2 ) and χ (3 ) nonlinearities implies that high-order parametric gain pumped by the second-harmonic light of the laser and seeded by self-phase-modulated sidebands is responsible.
Original language | English |
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Pages (from-to) | 172-175 |
Number of pages | 4 |
Journal | Optica |
Volume | 7 |
Issue number | 2 |
Early online date | 13 Feb 2020 |
DOIs | |
Publication status | Published - 20 Feb 2020 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
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Derryck Telford Reid
- School of Engineering & Physical Sciences, Institute of Photonics and Quantum Sciences - Professor
- School of Engineering & Physical Sciences - Professor
Person: Academic (Research & Teaching)