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Highly tunable efficient second-harmonic generation in a lithium niobate nanophotonic waveguide
Optica ( IF 10.4 ) Pub Date : 2018-08-16 , DOI: 10.1364/optica.5.001006
Rui Luo , Yang He , Hanxiao Liang , Mingxiao Li , Qiang Lin

Highly tunable coherent light generation is crucial for many important photonic applications. Second-harmonic generation (SHG) is a dominant approach for this purpose, which, however, exhibits a trade-off between conversion efficiency and wavelength tunability in a conventional nonlinear platform. Recent development of the integrated lithium niobate (LN) technology makes it possible to achieve a large wavelength tuning while maintaining a high conversion efficiency. Here we report on-chip SHG that simultaneously achieves a large tunability and a high conversion efficiency inside a single device. We utilize the unique strong thermo-optic birefringence of LN to achieve flexible temperature tuning of type-I intermodal phase matching. We experimentally demonstrate spectral tuning with a tuning slope of 0.84 nm/K for a telecom-band pump, and a nonlinear conversion efficiency of 4.7% W1, in an LN nanophotonic waveguide only 8 mm long. Our device shows great promise for efficient on-chip wavelength conversion to produce highly tunable coherent visible light for broad applications, while taking advantage of the mature and cost-effective telecom laser technology.

中文翻译:

铌酸锂纳米光子波导中高度可调的高效二次谐波产生

对于许多重要的光子应用而言,高度可调谐的相干光生成至关重要。为此,二次谐波产生(SHG)是一种主要方法,但是,在传统的非线性平台中,它会在转换效率和波长可调性之间进行权衡。集成铌酸锂(LN)技术的最新发展使得可以在保持高转换效率的同时实现大波长调谐。在这里,我们报告了片上SHG,它可以在单个器件内同时实现较大的可调性和较高的转换效率。我们利用LN独特的强热光双折射特性来实现I型联运相位匹配的灵活温度调节。我们通过实验证明了频谱调制对于电信泵浦的调谐斜率为0.84 nm / K,4.7 w ^-1个在仅8毫米长的LN纳米光子波导中。我们的设备在有效利用片上波长转换以产生适用于广泛应用的高度可调的相干可见光方面具有广阔的前景,同时还利用了成熟且具有成本效益的电信激光技术。
更新日期:2018-08-20
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