透射共振对二次谐波产生的增强

为了提高二次谐波产生转换效率,本文提出将一维周期光学超晶格两端贴上未被极化的厚度可以改变的非线性介质层,通过调整附加介质层的厚度来调制基频波的场,从而观察二次谐波产生转换效率的变化情况.结果表明:基频渡场可以很大程度地调制二次谐波产生;随着能量的增加,二次谐波产生转换效率增加,随着能量的减小,二次谐波产生转换效率减小;...

Enhancement of the Second Harmonic Generation Through Transmission Resonance

Second harmonic generation in one-dimensional periodic optical superlattice embedded in air is investigated. For the case of the optical superlattice embedded in air, though we take polishing technology to reduce the reflection of the incident light, the conversion efficiency is also very low and the fundamental wave is mudulated. In order to increase the second harmonic generation conversion efficiency, the periodic optical superlattice is sandwiched with nonpoled and nonlinear media with finite and variable width, which can bring about the significant modulation for the fundamental wave with changing the thickness of the additional media. We find the conversion efficiency increases or reduces when the energy of fundamental wave increases or reduces, in addition, it can be enhanced significantly when transmission resonance (the rate of transmission obtains 1) takes place, and compared with the conventional sample (the optical superlattice embedded in infinite and nonlinear media), the second harmonic generation conversion efficiency is enhanced 1.5 times at most , for the practical sample (the optical superlattice embedded in air), it can be enhanced 3.3 times at most. So the second harmonic generation conversion efficiency can be enhanced apparently by the transmission resonance.