Sheng Yan, Roppo Vito, Ren Mingliang, Kalinowski Ksawery, Cojocaru Crina, Trull Jose, Li Zhiyuan, Koynov Kaloian, Krolikowski Wieslaw
Laser Physics Center, Research School of Physics and Engineering, Australian National University, ACT 0200, Australia.
Opt Express. 2012 Feb 13;20(4):3948-53. doi: 10.1364/OE.20.003948.
We study Čerenkov-type second-harmonic generation in a two-dimensional quasi-periodically poled LiNbO3 crystal. We employ a new geometry of interaction to observe simultaneous emission of multi-directional nonlinear Čerenkov radiation with comparable intensities. This opens a way to control the angle of Čerenkov emission by tailoring the nonlinearity of the material, which is otherwise intrinsically defined by dielectric constants of the medium and their dispersion.
我们研究了二维准周期极化铌酸锂晶体中的切伦科夫型二次谐波产生。我们采用了一种新的相互作用几何结构，以观察具有可比强度的多方向非线性切伦科夫辐射的同时发射。这为通过调整材料的非线性来控制切伦科夫发射角开辟了一条途径，否则切伦科夫发射角本质上由介质的介电常数及其色散决定。
