基本相位截断傅里叶变换系统面对两步傅里叶迭代等攻击算法时，防御能力差极易被攻破，且加密时间长，密文密钥体积大，不便于分发与传输。提出将压缩感知与相位截断傅里叶变换光学非对称加密相结合，明文经离散小波变换分为低频信息和高频信息，利用压缩感知对高频信息压缩2/3，将其转化为低频信息的相位信息，共同构造大小为原明文图像1/4的待加密复图像。在第一块相位调制模板后增加一块振幅模板，采用设定阈值振幅截断方式，将部分振幅信息作为新私钥，相位角作为密文，实现加解密密钥完全不同，且一图一密。系统安全性能实验、攻击实验和对比实验表明，该加密系统可有效抵御各种攻击，鲁棒性高、传输量小、加密耗时短、解密图像重构质量好，整体性能优良。

提出了一种无需全息计算和相干照明的衍射投影方法和投影系统，利用非相干的准直LED光源和傅里叶变换透镜取代全息迭代计算获得被投影图像的空间频谱，再利用空间频谱在自由空间中的瑞利索墨菲衍射实现了小投射比、无限景深的图像投影.详细推导了投影方法的成像过程，解析了投影系统的强度脉冲响应函数.实验搭建了一套非全息衍射投影系统，对投影过程中产生的像差和亮度不均匀进行矫正，获得了无相干噪音的高品质衍射图像，实现了投射比为0.87的无限景深的衍射投影.在相距大于800 mm的不同深度平面上同时获得了清晰的投影图像，从而验证了方法的可行性.该投影方法和系统在球幕投影、任意曲面屏幕投影和增强现实投影等领域具有潜在的应用.

We demonstrate a novel type of miniature spectrometer based on a Fourier transform spectrometer (FTS) chip with a dense output array and a commercial photodetector (PD) array. The FTS chip has an output array cycle of 20 μm and consists of 51 Mach–Zehnder interferometers (MZIs), and the PD array is a commercial linear charged coupled device (CCD). An achromatic triplet lens is used to image the MZI output interferogram onto the CCD with a small aberration. Our experiment result shows that a free spectral range (FSR) from 489 nm to 584 nm and a retrieved spectral resolution of 3.5 nm at 532 nm are obtained. The achieved properties show that our spectrometer has the potential to outperform the best commercial compact one in terms of most performance indices.

To measure the global atmospheric three-dimensional distribution and change of temperature and humidity is one of the key areas in atmospheric remote sensing detection; it is also a new research and development direction in the field of meteorological satellite application. As a main element of China second generation of geostationary meteorological satellite Fengyun 4 (FY-4), which was launched on Dec. 11, 2016, the Geostationary Interferometric Infrared Sounder (GIIRS) is the first interferometric infrared sounder working on geostationary orbit internationally. It is used for vertical atmospheric sounding and gains atmospheric temperature, humidity, and disturbances. The combination of Fourier transform spectrometer technology and infrared detectors makes GIIRS have high spectral resolution and large coverage over spatial areas. With this kind of instrument, meteorological satellites can improve the capabilities for severe weather event monitoring and numerical weather prediction. Here a concise review of the GIIRS development project, including its history, missions and functions, technical design, key technologies, system integration, calibration and in-orbit operation status, etc., is presented.

We investigate the properties of spatial solitons in the fractional Schr dinger equation (FSE) with parity-time (PT)-symmetric lattice potential supported by the focusing of Kerr nonlinearity. Both one- and two-dimensional solitons can stably propagate in PT-symmetric lattices under noise perturbations. The domains of stability for both one- and two-dimensional solitons strongly depend on the gain/loss strength of the lattice. In the spatial domain, the solitons are rigidly modulated by the lattice potential for the weak diffraction in FSE systems. In the inverse space, due to the periodicity of lattices, the spectra of solitons experience sharp peaks when the values of wavenumbers are even. The transverse power flows induced by the imaginary part of the lattice are also investigated, which can preserve the internal energy balances within the solitons.