Nonlinear interactions in quadratic materials have for long been used to replicate and extend optical frequency combs (OFCs), originally generated in the visible and NIR, to other spectral regions where direct comb generation cannot be accomplished. In the last years, however, the occurrence of multiple cascaded second-order processes in a continuously pumped nonlinear cavity have proved to lead to the direct generation of entirely new OFCs, capable of multi-octave emission potentially across the whole transparency range of the nonlinear material. We experimentally observed the emergence of quadratic combs in a continuously-pumped cavity-enhanced second-harmonic generation (SHG) system, containing a second-order nonlinear crystal, showing that the onset of an internally pumped OPO immediately starts a series of multiple, cascaded quadratic processes, possibly leading to the formation of frequency combs. Similar OFCs have more recently been observed in a nearly degenerate OPO. We therefore developed a unified description of temporal and spectral dynamics, introducing single mean-field equations to model quadratic combs in both SHG and OPO cavities, revealing a new kind of walk-offinduced cavity modulation instability that triggers the formation of optical frequency combs and corresponding dissipative temporal patterns in both singly and doubly resonant cavity configurations.

Frequency comb generation in quadratic nonlinear cavities / Parisi, M.; Mosca, S.; Ricciardi, I.; Hansson, T.; Leo, F.; Coen, S.; Erkintalo, M.; Wabnitz, Stefan; Maddaloni, P.; Santamaria, L.; De Natale, P.; De Rosa, M.. - (2017). (Intervento presentato al convegno Photonics West 2017 tenutosi a San Francisco, USA).

Frequency comb generation in quadratic nonlinear cavities

WABNITZ, Stefan;
2017

Abstract

Nonlinear interactions in quadratic materials have for long been used to replicate and extend optical frequency combs (OFCs), originally generated in the visible and NIR, to other spectral regions where direct comb generation cannot be accomplished. In the last years, however, the occurrence of multiple cascaded second-order processes in a continuously pumped nonlinear cavity have proved to lead to the direct generation of entirely new OFCs, capable of multi-octave emission potentially across the whole transparency range of the nonlinear material. We experimentally observed the emergence of quadratic combs in a continuously-pumped cavity-enhanced second-harmonic generation (SHG) system, containing a second-order nonlinear crystal, showing that the onset of an internally pumped OPO immediately starts a series of multiple, cascaded quadratic processes, possibly leading to the formation of frequency combs. Similar OFCs have more recently been observed in a nearly degenerate OPO. We therefore developed a unified description of temporal and spectral dynamics, introducing single mean-field equations to model quadratic combs in both SHG and OPO cavities, revealing a new kind of walk-offinduced cavity modulation instability that triggers the formation of optical frequency combs and corresponding dissipative temporal patterns in both singly and doubly resonant cavity configurations.
2017
Photonics West 2017
04 Pubblicazione in atti di convegno::04d Abstract in atti di convegno
Frequency comb generation in quadratic nonlinear cavities / Parisi, M.; Mosca, S.; Ricciardi, I.; Hansson, T.; Leo, F.; Coen, S.; Erkintalo, M.; Wabnitz, Stefan; Maddaloni, P.; Santamaria, L.; De Natale, P.; De Rosa, M.. - (2017). (Intervento presentato al convegno Photonics West 2017 tenutosi a San Francisco, USA).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1213864
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