腔内三共振II类二次谐波产生中自发对称性破缺的实验证据
Experimental evidence of spontaneous symmetry breaking in intracavity type-II second harmonic generation with triple resonance
摘要：
我们描述了一个实验，显示了一个自发对称性破缺现象之间的普通和非常分量的强度的基本腔内II型谐波产生。它是基于一个三重谐振双腔包含一个II型相位匹配的$χ^{(2)}$晶体在基频$ω_0$泵浦。泵浦光束在腔中产生频率为$2ω_0$的二次谐波模式，其用作频率简并II型参数下变频的泵浦。在相对于基波的寻常分量和非寻常分量精确对称的操作条件下，我们观察到这两种波的强度的对称性的破坏与理论预测一致。
英文摘要：
We describe an experiment showing a spontaneous symmetry breaking phenomenon between the intensities of the ordinary and extraordinary components of the fundamental field in intracavity type-II harmonic generation. It is based on a triply resonant dual cavity containing a type II phase matched $χ^{(2)}$ crystal pumped at the fundamental frequency $ω_0$. The pump beam generates in the cavity a second harmonic mode at frequency $2ω_0$ which acts as a pump for frequency degenerate type II parametric down conversion. Under operating conditions which are precisely symmetric with respect to the ordinary and extraordinary components of the fundamental wave, we have observed a breaking of the symmetry on the intensities of these two waves in agreement with the theoretical predictions.
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