竞争chi（2）非线性的经典和量子特征
Classical and quantum signatures of competing chi(2) nonlinearities
摘要：
我们报告的竞争$χ^{(2)}$非线性的量子效应的第一个观察。我们还报告了新的经典签名的竞争，即钳位的二次谐波功率和生产的非简并频率在可见光。理论描述的意见，由于各种$χ^{(2)}$上转换和下转换过程之间的竞争。我们表明，竞争施加迄今未被怀疑的限制，发电和挤压。预计观察到的特征将在实际系统中产生显着影响。
英文摘要：
We report the first observation of the quantum effects of competing $χ^{(2)}$ nonlinearities. We also report new classical signatures of competition, namely clamping of the second harmonic power and production of nondegenerate frequencies in the visible. Theory is presented that describes the observations as resulting from competition between various $χ^{(2)}$ upconversion and downconversion processes. We show that competition imposes hitherto unsuspected limits to both power generation and squeezing. The observed signatures are expected to be significant effects in practical systems.
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