This book provides a clear introduction to topics which are essential to students in a wide range of scientific disciplines but which are otherwise only covered in speed and mathematically detailed texts. It shows how crystal structures may be built up from simple ideas of atomic packing and co-ordination, it develops the concepts of crystal symmetry, point and space groups by way of two dimensional examples of patterns and tilings, it explains the concept of the reciprocal lattice in simple terms and shows its importance in an understanding of light, X-ray and electron diffraction. Practical examples of the applications of these techniques are described and also the importance of diffraction in the performance of optical instruments.

POPPY：Python中的物理光学传播 罂粟（P物质环境øptics P ropagation在PY马拉松）是一种Python包，包括模拟衍射物理光学传播。 它实现了一个灵活的框架，可以对弗劳恩霍夫和菲涅耳衍射以及点扩散函数的形成进行建模，尤其是在天文望远镜的情况下。 POPPY是作为James Webb空间望远镜模拟程序包的一部分而开发的，但是更广泛地适用于多种成像模拟。 但是，它并不是高保真度光学设计软件（例如Zemax或Code V）的替代品，而是旨在作为衍射光学而非几何光学是人们关注的主题且需要平台之间可移植性的情况的轻巧替代品或易于编写脚本。 有关文档，请参见 Marshall Perrin，Joseph Long，Ewan Douglas，Neil Zimmerman，Anand Sivaramakrishnan，Shannon Osborne，Kyle Dougl

Five conical harmonic beams are generated from the interaction of femtosecond mid-infrared (mid-IR) pulses at a nominal input wavelength of 1997 nm with a 2D LiNbO3 nonlinear photonic crystal with Sierpinski fractal superlattices. The main diffraction orders and the corresponding reciprocal vectors involved in the interaction are ascertained. Second and third harmonics emerging at external angles of 23.82° and 36.75° result from nonlinear ?erenkov and Bragg diffractions, respectively. Three path

We propose a spatial diffraction diagnostic method via inserting a millimeter-gap double slit into the collimated terahertz beam to monitor the minute variation of the terahertz beam in strong-field terahertz sources, which is difficult to be resolved in conventional terahertz imaging systems. To verify the method, we intentionally fabricate tiny variations of the terahertz beam through tuning the iris for the infrared pumping beam before the tilted-pulse-front pumping setups. The phenomena can

It is well known that a light spot of sub-wavelength will diverge in all directions. In this letter, A method is presented for generating sub-wavelength (0.44\lambda) longitudinally polarized beam, which propagates without divergence over lengths of about 2\lambda in free space. This is achieved by a high numerical aperture (NA) lens axicon that utilizes spherical aberration to duplicate the performance of an axicon and to create an extended focal line.

Diffraction loss for several solid shapes with GTD-UTD.zip

这是A.P.Stokseth 的文章： "Properties of a defocused optical system"的MATLAB实现。

Keller于1961年在美国光学协会学报上发表的经典之作，衍射光学