Photonic chip-based resonant supercontinuum via pulse-driven Kerr microresonator solitons
| Autor: | Junqiu Liu, Tobias J. Kippenberg, Romain Bouchand, E. Obrzud, Miles Anderson, Wenle Weng, Tobias Herr |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics::Optics
02 engineering and technology frequency-comb 01 natural sciences 010309 optics Frequency comb generation 0103 physical sciences Dispersion (optics) crystals phase Physics business.industry temporal solitons dynamics 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Supercontinuum Pulse (physics) Pulse compression efficiency Picosecond Optoelectronics dispersion Soliton ddc:620 0210 nano-technology business light Photonic-crystal fiber |
| Zdroj: | Optica 8(6), 771-779 (2021). doi:10.1364/OPTICA.403302 OPTICA |
| DOI: | 10.3204/PUBDB-2021-00030 |
| Popis: | Optica 8(6), 771 - 779 (2021). doi:10.1364/OPTICA.403302 Supercontinuum generation in optical fibers is one of the most dramatic nonlinear effects discovered, allowing short pulses to be converted into multi-octave spanning coherent spectra. However, generating supercontinua that are both coherent and broadband requires pulses that are simultaneously ultrashort with high peak power. This results in a reducing efficiency with increasing pulse repetition rate, that has hindered supercontinua at microwave line spacing, i.e. 10s of GHz. Soliton microcombs by contrast, can generate octave-spanning spectra, but with good conversion efficiency only at vastly higher repetition rates in the 100s of GHz. Here, we bridge this efficiency gap with resonant supercontinuum, allowing supercontinuum generation using input pulses with an ultra-low 6 picojoule energy, and duration of 1 picosecond, 10-fold longer than what is typical. By applying synchronous pulse-driving to a dispersion-engineered, low-loss Si$_3$N$_4$ photonic chip microresonator, we generate dissipative Kerr solitons with a strong dispersive wave, both bound to the input pulse. This creates a smooth, flattened 2,200 line frequency comb, with an electronically detectable repetition rate of 28 GHz, constituting the largest bandwidth-line-count product for any microcomb generated to date. Strikingly, we observe that solitons exist in a weakly bound state with the input pulse, stabilizing their repetition rate, but simultaneously allowing noise transfer from one to the other to be suppressed even for offset frequencies 100 times lower than the linear cavity decay rate. We demonstrate that this nonlinear filtering can be enhanced by pulse-driving asynchronously, in order to preserve the coherence of the comb. Taken together, our work establishes resonant supercontinuum as a promising route to broadband and coherent spectra. Published by OSA, Washington, DC |
| Databáze: | OpenAIRE |
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