202203024-光学可重构准相位匹配氮化硅微谐振腔（ring）

all-optical poling (AOP) ，全光极化

two-photon (TP) microscopy

a vector network analyser (VNA)

conversion efficiency (CE)

Here CE is defined as CE = P_SH/P_P^2, where P_SH and P_P are the on-chip SH and pump power, respectively.

The use of a high-quality-factor (Q) Si3N4 microresonator not only facilitates the onset of optical poling, but also achieves an ultrahigh CE on-chip34, benefiting from the doubly resonant enhancement both at the pump and SH.

使用高质量因数 (Q) Si3N4 微谐振器不仅有利于光极化的开始，而且还实现了超高的片上 CE，这得益于泵和 SH 处的双谐振增强。

The sample temperature can be varied using a proportional–integral–derivative controller and a Peltier module.

通过矢量网络分析仪，EOM，快速PD获得detuning信号：

In this scenario, the laser is weakly phase-modulated in an electro-optic modulator (EOM) by a scanning microwave signal from a vector network analyser (VNA). The generated signal at
the SH band is measured by a fast silicon photodetector (PD3) to obtain the VNA response. The transfer function measured by the VNA is explicitly described in Supplementary Note 2, and is found to provide the detuning information of both interacting resonances。

赞

1、细节拉满。对1-5阶模式分布的直接观测。

2、证据确凿。二次谐波（倍频）能量直接测量。

3、光pump重构。可以在任意波长产生倍频

踩

需要一直扫描？不能定波长输入？

带宽怎么定义的？

展

确定输入波长，用热调谐扫描，然后热自锁稳定。