各向异性线性和非线性晶格的光折变写入和探测
Photorefractive writing and probing of anisotropic linear and non-linear lattices
摘要：
我们实验研究的一维和二维光折变晶格的写入，专注于经常被忽视的瞬态制度。我们的测量结果与理论吻合得很好，特别是关于漂移扩散项的比例。然后，我们研究了在晶格中传播的相干波的横向动力学，在一些新颖的和简单的配置。对于具有宽横向谱的聚焦线性波，我们注意到实空间（“离散衍射”）和傅里叶空间（“布里渊区光谱”）中的强度分布都反映了布拉格平面和能带结构。对于非线性波，我们观察到调制不稳定性和离散孤子的形成在时域。我们还讨论了光感应技术固有的非理想效应：各向异性，剩余非线性，扩散项，非平稳性。
英文摘要：
We study experimentally the writing of one- and two-dimensional photorefractive lattices, focusing on the often overlooked transient regime. Our measurements agree well with theory, in particular concerning the ratio of the drift to diffusion terms. We then study the transverse dynamics of coherent waves propagating in the lattices, in a few novel and simple configurations. For focused linear waves with broad transverse spectrum, we remark that both the intensity distributions in real space ("discrete diffraction") and Fourier space ("Brillouin zone spectroscopy") reflect the Bragg planes and band structure. For non-linear waves, we observe modulational instability and discrete solitons formation in time domain. We discuss also the non-ideal effects inherent to the photo-induction technique : anisotropy, residual nonlinearity, diffusive term, non-stationarity.
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