Aiming at the security problem of range gated laser imaging in high noise background, a range gated laser image encryption scheme based on the quantum genetic algorithm (QGA) is proposed. Due to the fuzziness of the laser image itself, the randomness and security of the key become more and more important in encryption. In this paper, the chaotic sequence is used as the parent chromosome of the QGA, and the random number satisfying the encryption algorithm is obtained by an iterative genetic algorithm. To further improve the security of laser images, some random pixels are stochastically inserted around the laser image before scrambling. These random pixels are scrambled together with the image. Finally, an adaptive diffusion method is designed to completely change the original statistical information of the image. Experimental simulation and performance analysis show that the scheme has high security.

为了对电子束泵浦钙钛矿量子点器件的建模与设计提供理论支撑，探究了电子束泵浦钙钛矿量子点膜层发光的微观过程，揭示了其能量转化模型与发光机理。首先从理论层面分析了电子束泵浦钙钛矿量子点发光与激射的微观物理过程，指出电子束泵浦量子点发光的激射阈值与发光阈值是构建其能量转化模型所需检测的宏观物理约束边界。分析讨论了其激射阈值与发光阈值的有效检测方法，并多次开展了具体的评估实验。最后，结合检测物理约束边界，模拟并构建了钙钛矿量子点膜层内部发光能量转化效率、纳米晶极化分布随电子束泵浦强度变化的关系。

The existing image encryption schemes are not suitable for the secure transmission of large amounts of data in range-gated laser imaging under high noise background. Aiming at this problem, a range-gated laser imaging image compression and encryption method based on bidirectional diffusion is proposed. The image data collected from the range-gated laser imaging source is sparsely represented by the discrete wavelet transform. Arnold chaotic system is used to scramble the sparse matrix, and then the measurement matrix is constructed by the quantum cellular neural network (QCNN) to compress the image. In addition, the random sequence generated by QCNN hyperchaotic system is used to carry out "bidirectional diffusion" operation on the compression result, so as to realize the security encryption of image data. The comparative analysis of the security encryption performance of different compression ratios shows that the histogram sample standard of the encrypted image can reach about 10, and the information entropy value is more than 7.99, which indicates that the encryption scheme effectively hides the plaintext information of the original image. When the encrypted image is attacked by different degrees of noise, this method can still reconstruct the image through the effective decryption process. The experimental results show that this method realizes the secure compression and encryption of gated-laser imaging image data, and effectively ensures the security of data while reducing the amount of channel transmission data.

基于分步傅里叶法研究了饱和非线性介质中艾里光束与孤子的交互作用。仿真结果表明,单艾里光束与孤子作用时,可通过调节艾里光束与孤子的初始强度比、光束初始间隔及相位差控制交互作用后光波的传播模式。弱能量艾里光束与孤子碰撞后会形成峰值强度呈阻尼振荡的呼吸孤子,而同相位时,强能量艾里光束与孤子碰撞后会使呼吸孤子的峰值强度位置左移;反相位时,则会产生峰值强度不等且存在一定夹角的孤子对。双艾里光束与孤子作用时,可通过调节三光束间的初始间隔和相位差调整呼吸孤子的平均峰值强度,且艾里光束主瓣及旁瓣会随双艾里光束与孤子初始振幅比的增加发生能量脱落,此时呼吸孤子和孤子对共存。

针对微光系统光子数量较少的问题,研制出符合色度学的光学调色膜,构成六基色彩色滤镜,从而提升色彩还原度。通过对光谱特性的分析,利用Essential Macleod膜系设计软件以及Mathcad工程计算软件,建立采点迭代法优化模型,实现光学调色膜的膜系设计。采用电子束热蒸发方法制备薄膜。利用光控与晶控相结合的方法进行膜厚控制,以膜堆为单元进行反演分析,实现光学调色膜的研制。该薄膜通过光谱测试,满足使用要求。

为改善波导栅型薄膜复合探测器件位敏阳极读出光电信号质量，降低栅型薄膜引起的电子束多径展宽对阳极探测信号的影响，研究了微通道板波导栅型复合探测信号在阳极的直接耦合提取方法。根据低能电子束在多元介质中的散射模型，利用蒙特卡洛统计方法对入射到栅型薄膜中的低能电子束轨迹进行模拟，并分析均匀分布和高斯分布下波导栅极引入噪声和透射电子束径向偏移对阳极信号提取精度的影响。对透射过栅型薄膜到达阳极的微弱光电脉冲信号的前置放大和串联压控多级级联放大模式，给出适用于加性高斯分布噪声叠加下基于Sallen-Key拓扑结构的四阶切比雪夫低通滤波和峰值保持电路的专用提取方案，减小波导栅型薄膜对信号信噪比和频响特性的影响。搭建专用波导栅型复合探测位敏信号读出平台，结合系统并行单点接地的连接模式和楔条形阳极位敏电荷直接耦合提取方式，验证器件阳极信号提取方法，获得2 μs脉宽，200 kHz频率的准高斯脉冲提取信号。