Since the invention of the diode laser, it has been widely used in various fields by virtue of its advantages such as high stability, high photoelectric conversion efficiency and small size. However, due to the large difference in beam quality between the fast axis and the slow axis, it cannot be directly applied. Dense beam wavelength combining technology is used as a method to increase power and ensure the quality of laser beams. The light source based on two packaging forms of single emitter diode laser and diode laser bar is discussed. The development status of dense beam wavelength combining technology of high power, high beam quality diode lasers at home and abroad is introduced. The technical characteristics of beam combining are discussed. And the development trend is forecasted.

Advanced missiles equipped with laser fuze are introduced. The modes, principles and some representative equipments of laser fuze jamming are summarized. At the same time, the laser fuze passive jamming technology and operation modes are discussed, and the future development trend of laser passive jamming technology is pointed out. Laser fuze passive jamming technology can be applied to a variety of platforms, which not only strengthens the level of self-defending, but also greatly improves the survivability of the platforms in battlefield.

A design method for a long focal length and co-aperture optical system with double field of view (FOV) and triple spectrum such as laser, visible light and medium-wave infrared band is described. An optical structure combining with off-axis three-mirror beam shrinkage and FOV switching is adopted in the front end of the system, which can realize the compression and FOV translation of large-aperture incident beam. A beam splitter group is adopted in the rear end of the system to divide the spectrum into three channels, which is excited into laser, visible light and medium-wave infrared imaging group respectively. And the combination imaging of each spectral band is realized. Through reasonable design, each spectral band has excellent imaging quality and can meet the requirements of the system.

An optical system of handheld low-light level night vision sight based on customer specifications is designed, which can meet the needs of day and night. At first, the optical parameters are calculated according to the customer's specifications, the complementary metal oxide semiconductor (CMOS) detector and the display screen are selected. And then, the low-light objective lens and eyepiece are designed. At last, the final image quality evaluation results show that the optical system has good imaging quality and can meet the actual engineering needs.

Free-space laser communication has a wide range of application prospects in the field of wireless communication due to its high transmission rate, good security performance, small volume and mass. It can effectively solve the problems of low communication rate and large volume in microwave communication, especially in the satellite field. In order to realize a long-distance, high-speed inter-satellite laser communication system, it is necessary to introduce a digital laser communication receiver to flexibly suppress interference and noise and improve communication sensitivity. According to the principle of digital communication error probability, a digital receiver based on field programmable gate array (FPGA) is designed. Filtering algorithms such as finite impulse response, dynamic threshold and baseband median are used to optimize the signal-to-noise ratio and improve detection sensitivity. At the same time, the sensitivity testing experimental structure of the 1 550 nm laser communication receiver is designed, and the sensitivity testing experiment is carried out. Experimental results show that the avalanche photo diode (APD) receiver achieves a detection sensitivity of -52.57 dBm close to the theoretical design value at a communication rate of the order of Mbps. The signal-to-noise ratio is increased by about 10 dB through the digital filtering algorithm, which provides theoretical guidance for the receiver design of satellite laser communication.

At first, the development of compound eye bionics in China is briefly reviewed. The field of view, angular resolution and optical aperture of the compound eye optical system are defined. And then, the effective sight distance of the dragonfly compound eye is calculated by formula and experiment. The optical apertures of the dragonfly compound eye for point target, wide background outside the effective sight distance and cylindrical or strip target inside the effective sight distance are given. It is shown that the apposition multi aperture optical system of insect compound eye has the performance of orientation and tracking. At last, the applications in national economy and military are prospected.

Based on theory analysis and numerical simulation method, a heating model on the irradiated structure component of optical system and an illuminance distribution model on infrared radiation from the structure and optical components on focal plane are built. On the basis, simulation software is compiled. Through the calculation results from the software, the distribution of temperature improved due to the laser irradiating the infrared optical system and the effect of second radiation of the optical and structure components are analyzed. The effect of temperature improved on an optical system with typical structure is performed simulation calculation, and the effect of second radiation to the detector is discussed. It is found that even the wavelength of incident laser is not matched to the operation wavelength of the infrared detection system, the detection efficiency can be reduced obviously by second radiation.

Based on the theoretical analysis of least mean square (LMS) algorithm, by using the adaptive equalizer with post feedback, the waveform distortion of hundred-nanosecond laser pulse is restrained, and the gain of Er3+/Yb3+ co-doped double clad fiber amplifier is flattened. A distorted waveform and pulse width narrowing are observed after two-stage cascade amplification. Based on LMS algorithm, the distorted waveform can be fitted by an adaptive equalizer. The waveform of the trigger signal is adjusted through calculation to make the top of pulse laser tend toward flat. And experimental verification is performed.

Based on the photoelectric generation and electroluminescence characteristics of photodiodes, the photoelectric to electro-optical conversion characteristics can be realized. Therefore, solar cells and light-emitting diodes being made by various semiconductor photoelectric materials have attracted great interest in recent years. However, the current photoelectric conversion devices require low manufacturing cost, high photovoltaic performance and energy saving and environmental protection characteristics. So a new photovoltaic material is needed to be found to meet the above requirements. Metal halide perovskite, represented by MAPbI3, is an ideal material for new optoelectronic devices because of its advantages such as simple growth process, wide spectral absorption range and high defect tolerance. The working principle of photoelectric to electro-optical conversion in two kinds of photoelectric devices is analyzed.

The thermal decomposition characteristics and compatibility of PTPB and ADN, AP, BDNPF/A, DOS, RDX and Al are studied by DSC method. The results show that PTPB has good compatibility with RDX and Al, has poor compatibility with A and AND, and has no compatibility with AP and DOS.

Electro static discharge (ESD) is a problem often met in liquid crystal display (LCD) production, which may produce in every process. Based on the actual situation met in the process, the reasons for ESD are studied. Through theoretical analysis and experimental verification, if there are many sharp peaks in the crystallization of the Indium Tin Oxide (ITO) film, due to the micro-electricity and the potential difference, it is easy to cause electrostatic discharge, which burns or even breaks down the ITO traces. The target use time, temperature and atmosphere technology are verified, and the results show that the adjustment of the atmosphere technology is an effective method to solve ESD problem. Through atmosphere technology adjustment, ESD testing performance of LCD reaches the requirements, and the proportion of defective ESD decreases from 18.9% to less than 0.002%. Through improvements, product quality is improved, production cost is reduced and good economic benefits are achieved.

Distributed fiber acoustic sensing based on coherent optical time-domain reflectometry (C-OTDR) is an important tool for vibration detection. However, the response of the C-OTDR system is affected by the intensity fluctuation of the interfering light, which makes quantitative measurement difficult. The response characteristics of a commercial C-OTDR system in the typical case of a single-frequency continuous point vibration source are studied. Experimental results show that the system can detect the location and the central frequency of the vibration accurately. And two signal processing methods are examined. The linear relation between the response and the excitation amplitude can be restored through averaging the spectra in time domain. The distribution of vibration amplitudes is maintained by the spatial distribution of the response within a certain range. The two methods can negate the influence from the signal fluctuation satisfactorily, which is helpful to realize more consistent and precise measurement of the system.

An improved infrared and visible image fusion method is proposed to solve problems that comprise low definition, fuzzy contour and poor adaptability for traditional image fusion methods. By mean of NSCT scheme for decomposing infrared and visible images, the sub-band coefficients of bandpass and low-frequency are obtained, respectively. MSF-PCNN is used to obtain high-frequency fusion coefficient, and provide the performance improvement of PCNN, namely NL-PCNN, which is to gain low-frequency fusion coefficient. According to two different data sources of low-frequency domain, the improved filters, such as the sharp-weighted filter and mean-weighted filter, have the ability of separating the frequency gradient to extract the profile. Experimental results show that the proposed fusion algorithm is effective. It offers advantages over the traditional image fusion algorithm for obtaining image contour information and enhancing the fusion image clarity, which has high adaptive ability.

Based on the electromagnetic scattering, coupling effect and the theory of vector transmission, combined with the demands of the coupling group electromagnetic characteristics of air combat and the theory deficiency, the technical route of electromagnetic scattering simulation based on the theory of vector transmission is proposed, and the theoretical model of coupling group in complex air environment is established. In addition, the electromagnetic scattering imaging of typical aerial platform targets and interference groups are studied. Through the simulation calculation of the coupling effect and the numerical simulation of the spatial distribution of the typical air flow field and the dynamic spatial distribution of the coupling group, the simulation analysis of the spatial coupling effect of the jamming material is carried out. It provides the theoretical and simulation model supports for improving the survivability of the weapon platform and the application of interference in the complex electromagnetic environment of the air battle field.

The relationship between the comprehensive deviation and dihedral angle error of the hollow corner cube reflector measured by interferometry is derived. The characteristics and interpretation rules of the interference pattern of the hollow corner cube reflector are summarized. A laser Twyman-Green interferometer is built to measure and analyze the angle error of a hollow corner cube reflector. Experimental results show that the accurate measurement of the angle error less than 1″ of the reflector can be realized by the theoretical method and laser Twyman-Green interferometer.