| 1. |
- Wabnitz, S., et al.
(författare)
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Quadratic Optical Frequency Combs: Towards a New Platform for Multi-Octave Microcombs
- 2020
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Ingår i: INTERNATIONAL CONFERENCE LASER OPTICS 2020 (ICLO 2020). - : IEEE. - 9781728152332
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Konferensbidrag (refereegranskat)abstract
- Optical frequency comb sources based on three-wave-mixing in quadratic nonlinear materials allow for reduced pump power threshold and extended spectral coverage. We review recent progress on quadratic optical frequency combs based on second-harmonic generation and optical parametric oscillation.
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| 2. |
- Erkintalo, M., et al.
(författare)
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Frequency combs in quadratically nonlinear resonators
- 2016
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Ingår i: Optics InfoBase Conference Papers. - 2162-2701. - 9781943580170 ; , s. paper NM3A.1-
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Konferensbidrag (refereegranskat)abstract
- We describe the physics and modelling of frequency combs and corresponding temporal patterns in coherently driven, quadratically nonlinear resonators.
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| 3. |
- Erkintalo, M., et al.
(författare)
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Numerical modelling of frequency comb generation in nonlinear resonators
- 2016
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Ingår i: 16th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2016, Sydney, Australia, 11-15 July 2016. - 2158-3234. - 9781467386036 ; , s. 187-188
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Konferensbidrag (refereegranskat)abstract
- We present a comprehensive review of recent work on numerical modelling of frequency comb generation in coherently-driven nonlinear resonators. Specifically, we discuss modelling and nonlinear dynamics of frequency combs generated in Kerr nonlinear microresonators, emphasizing links to similar dynamics studied in macroscopic fibre cavities. In addition to established Kerr frequency comb generators, we will also discuss emerging comb generation platforms based on continuously-driven quadratically nonlinear resonators.
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| 4. |
- Leo, F., et al.
(författare)
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Frequency-comb formation in doubly resonant second-harmonic generation
- 2016
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Ingår i: Physical Review A - Atomic, Molecular, and Optical Physics. - 2469-9926 .- 2469-9934. ; 93:4
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Tidskriftsartikel (refereegranskat)abstract
- We theoretically study the generation of optical frequency combs and corresponding pulse trains in doubly resonant intracavity second-harmonic generation (SHG). We find that, despite the large temporal walk-off characteristic of realistic cavity systems, the nonlinear dynamics can be accurately and efficiently modeled using a pair of coupled mean-field equations. Through rigorous stability analysis of the system's steady-state continuous-wave solutions, we demonstrate that walk-off can give rise to an unexplored regime of temporal modulation instability. Numerical simulations performed in this regime reveal rich dynamical behaviors, including the emergence of temporal patterns that correspond to coherent optical frequency combs. We also demonstrate that the two coupled equations that govern the doubly resonant cavity behavior can, under typical conditions, be reduced to a single mean-field equation akin to that describing the dynamics of singly-resonant-cavity SHG [F. Leo et al., Phys. Rev. Lett. 116, 033901 (2016)]. This reduced approach allows us to derive a simple expression for the modulation instability gain, thus permitting us to acquire significant insight into the underlying physics. We anticipate that our work will have a wide impact on the study of frequency combs in emerging doubly resonant cavity SHG platforms, including quadratically nonlinear microresonators.
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| 5. |
- Leo, F., et al.
(författare)
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Walk-Off-Induced Modulation Instability, Temporal Pattern Formation, and Frequency Comb Generation in Cavity-Enhanced Second-Harmonic Generation
- 2016
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Ingår i: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 116:3
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Tidskriftsartikel (refereegranskat)abstract
- We derive a time-domain mean-field equation to model the full temporal and spectral dynamics of light in singly resonant cavity-enhanced second-harmonic generation systems. We show that the temporal walk-off between the fundamental and the second-harmonic fields plays a decisive role under realistic conditions, giving rise to rich, previously unidentified nonlinear behavior. Through linear stability analysis and numerical simulations, we discover a new kind of quadratic modulation instability which leads to the formation of optical frequency combs and associated time-domain dissipative structures. Our numerical simulations show excellent agreement with recent experimental observations of frequency combs in quadratic nonlinear media [Phys. Rev. A 91, 063839 (2015)]. Thus, in addition to unveiling a new, experimentally accessible regime of nonlinear dynamics, our work enables predictive modeling of frequency comb generation in cavity-enhanced second-harmonic generation systems. We expect our findings to have wide impact on the study of temporal and spectral dynamics in a diverse range of dispersive, quadratically nonlinear resonators.
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| 6. |
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| 7. |
- Leo, F., et al.
(författare)
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Theory of Frequency Comb Generation in Cavity Enhanced Second Harmonic Generation
- 2016
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Ingår i: 2016 Conference on Lasers and Electro-Optics, CLEO 2016, San Jose, United States, 5-10 June 2016. - 2160-9020. - 9781943580118
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Konferensbidrag (refereegranskat)abstract
- We theoretically investigate frequency comb generation in dispersive quadratically nonlinear resonators. We introduce a single mean field equation to model cavity enhanced second harmonic generation and find excellent agreement with recent experimental frequency comb observations.
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