Laser Physics Center, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
Opt Lett. 2011 Jul 1;36(13):2593-5. doi: 10.1364/OL.36.002593.
We investigate theoretically the Čerenkov-type second-harmonic generation in two-dimensional bulk nonlinear photonic crystal with longitudinal modulation of the χ((2)) nonlinearity. We show that in this scheme the Čerenkov radiation can be achieved simultaneously at multiple directions with comparable intensities. The angles of emission are controllable by the spatial modulation of the nonlinearity. We propose a design of the periodically poled domain pattern, which maximizes the efficiency of the second-harmonic emission.
我们从理论上研究了具有 χ((2)) 非线性纵向调制的二维体块非线性光子晶体中的切伦科夫型二次谐波产生。结果表明，在该方案中，可以在多个方向上同时获得具有可比强度的切伦科夫辐射。发射角可以通过非线性的空间调制来控制。我们提出了一种周期性极化区模式的设计方案，该方案可以最大限度地提高二次谐波发射的效率。
