Temporal walk-off induced dissipative quadratic solitons
Temporal walk-off induced dissipative quadratic solitons
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DOI：
10.1038/s41566-021-00942-4
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发表时间：
2022-01-31
期刊：
影响因子：
35
通讯作者：
Marandi, Alireza
中科院分区：
文献类型：
--
作者：
Roy, Arkadev;Nehra, Rajveer;Marandi, Alireza
最近，大量的应用激发了人们在克尔孤立子和相干频率梳的产生方面做出了广泛的努力。然而，克尔（立方）非线性本质上是弱的。相比之下，强二次非线性光学谐振腔有望提供一个有前途的替代手段孤子形成。在这里，我们证明了耗散二次孤子形成通过非平稳光参量放大在泵和信号之间存在明显的时间走离，导致半谐波产生伴随着大量的脉冲压缩（超过40倍）支持在低泵浦脉冲能量（类似于4 pJ）。在正常色散和反常色散情况下，低精细度腔中均形成二次孤子。我们提出了一个路线，大大提高了性能的表现二次孤子扩展到一个集成的平台，实现高效的极端脉冲压缩，导致形成的几个周期的孤子脉冲从超低能量皮秒级泵浦脉冲。
A plethora of applications have recently motivated extensive efforts regarding the generation of Kerr solitons and coherent frequency combs. However, the Kerr (cubic) nonlinearity is inherently weak. By contrast, strong quadratic nonlinearity in optical resonators is expected to provide a promising alternative means for soliton formation. Here we demonstrate dissipative quadratic soliton formation via non-stationary optical parametric amplification in the presence of pronounced temporal walk-off between pump and signal, leading to half-harmonic generation accompanied by a substantial pulse compression (exceeding a factor of 40) supported at low pump pulse energies (similar to 4 pJ). The quadratic soliton forms in a low-finesse cavity in both normal and anomalous dispersion regimes. We present a route to considerably improve the performance of the demonstrated quadratic soliton when extended to an integrated platform to realize highly efficient extreme pulse compression, leading to the formation of few-cycle soliton pulses starting from ultra-low-energy picosecond-scale pump pulses.