Izús Gonzalo, San Miguel Maxi, Walgraef Daniel
Instituto Mediterráneo de Estudios Avanzados, IMEDEA (CSIC-UIB), Universitat de les Illes Balears, E-07071 Palma de Mallorca, Spain.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Sep;66(3 Pt 2A):036228. doi: 10.1103/PhysRevE.66.036228. Epub 2002 Sep 30.
We study the role of a direct intracavity polarization coupling in the dynamics of transverse pattern formation in type-II optical parametric oscillators. Transverse intensity patterns are predicted from a stability analysis, numerically observed, and described in terms of amplitude equations. Standing wave intensity patterns for the two polarization components of the field arise from the nonlinear competition between two concentric rings of unstable modes in the far field. Close to threshold a wavelength is selected leading to standing waves with the same wavelength for the two polarization components. Far from threshold the competition stabilizes patterns in which two different wavelengths coexist.
我们研究了直接腔内偏振耦合在II型光学参量振荡器横向模式形成动力学中的作用。通过稳定性分析预测横向强度模式，进行数值观测，并根据振幅方程进行描述。场的两个偏振分量的驻波强度模式源于远场中两个不稳定模式同心环之间的非线性竞争。接近阈值时，会选择一个波长，导致两个偏振分量具有相同波长的驻波。远离阈值时，竞争使两种不同波长共存的模式稳定下来。
