We demonstrate the simultaneous generation of second, third, and fourth harmonics from a single dielectric bismuth ferrite nanoparticle excited using a telecom fiber laser at 1560 nm. We first characterize the signals associated with different nonlinear orders in terms of spectrum, excitation intensity dependence, and relative signal strengths. Successively, on the basis of the polarization-resolved emission curves of the three harmonics, we discuss the interplay of susceptibility tensor components at different orders and show how polarization can be used as an optical handle to control the relative frequency conversion properties.

中文翻译：

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通过二次，三次和三次谐波产生，在电信波长激发的铋铁氧体电介质纳米颗粒作为多色光源†

我们演示了使用1560 nm的电信光纤激光器激发的单个电介质铋铁氧体纳米粒子同时产生第二，第三和第四谐波的情况。我们首先根据频谱，激发强度相关性和相对信号强度来表征与不同非线性阶次相关的信号。随后，基于三个谐波的偏振分辨发射曲线，我们讨论了不同阶数的磁化率张量分量之间的相互作用，并展示了如何将偏振用作控制相对频率转换特性的光学手柄。