As a new concept weapon, laser weapons have been attached importance to by many countries in the world. The United States has been leading the world in the development of laser weapons, especially Lockheed Martin has set world records in the power of fiber laser weapons. The technical scheme, features, achievements and projects under development of Lockheed Martin in the development of laser weapons are introduced. And the development course of fiber laser weapons is showed.

A compact Nd:YAG nanosecond laser passively Q-switched by Cr4+:YAG crystal with the operation repetition tunable from 1 Hz to 10 Hz is reported. Type II phase match crystal of KTP is adopted for the frequency doubling to obtain the stable output of 532 nm laser pulse. The single laser pulse energy of 1 064 nm is approximately 800 mJ and the laser pulse width is around 7 ns. The output energy of 532 nm exceeds 500 mJ, and the average pulse energy at different operation repetition are given as 551 mJ@1 Hz, 553 mJ@3 Hz, 546 mJ@5 Hz and 518 mJ@10 Hz, respectively. The RMS of 532 nm laser pulse energy is less than 6.2%. When the laser beam is injected onto a ground glass of 20 cm, the spot image is measured by a scientific-level CCD. The result shows that the second-order quantum correlation function g(2) value of the pseudo-thermal light is 1.963, close to the theoretical value of 2. The laser system promises the improvement of Ghost imaging quality.

In order to solve the issue of low utilization of light and low-precision reconstruction in the existing coded aperture snapshot spectral imager (CASSI), the computational spectrometry characteristic of high utilization of light and precision is developed through the research on CASSI. Compared with CASSI, sample of the full-color branch is added, which is complementary to the CASSI branch in data. Imaging experiment results show the underdetermined degree of reconstruction decreases sharply. By the data alignment and fusion between the full-color branch and CASSI branch, the high-precision data reconstruction is finished. As compared with CASSI, utilization of the optical throughput in the developed system is doubled.

High refractive index cemented beam splitting prism is widely used in aberration correction of complex optical systems, which can reduce the number of lenses and improve the image quality. However, in the process of high refractive index cemented beam splitting prism, the flatness of spectral curve is very poor, and even the spectral curve is difficult to achieve. By introducing the structure of cemented beam splitting prism, the characteristics of optical adhesive and the principle of optical wave time coherence, the prism with flat spectral curve of 420~720 nm, T:R=1:1±0.03, T+R≥95% on ZF88 high refractive index optical glass substrates is designed and fabricated. This technology breaks through the deviation effect of spectral curve for glued parts, and provides a new theoretical basis and preparation scheme for the design and fabrication of optical thin films.

At the time of detecting targets, an infrared seeker mainly depends on infrared radiation differences between targets and backgrounds during atmospheric transmission. The key tactical and technology parameters such as the maximum capturing distance detected by the infrared seeker are influenced by different factors during the process, for instance, the maximum capturing distance may be decreased for different visibility and temperature under special environments, the captured targets are imaged unclear, and it is difficult to detect small targets at normal distance. According to the variation trend of different factors on infrared transmission, the impact on key tactical and technology parameters from atmosphere transmission is analyzed. Under the condition of deciding the impact and the obtained tactical and technology parameters through experiments, the variation of main factors on the parameters is analyzed and built, which provides technique support for the following experiments.

The temperature error characteristics of the fiber optic current sensor (FOCS) based on polarization modulation principle is theoretically analyzed to meet the requirement of engineering application. The temperature compensation of FOCS is realized by least squares method and BP neural network respectively. The nonlinear temperature error correction is realized. And the experimental results of the two temperature compensation algorithms are compared and analyzed. The result shows that the temperature compensation result based on neural network algorithm is better than that of least squares method. The full temperature experiment of FOCS is used to verify the reproducibility. The experimental results show that after corrected by the neural network algorithm, the temperature error of FOCS in the range of from -5 ℃ to +50 ℃ is less than 0.5%.

The target tracking technology has been widely and deeply applied in many areas such as unmanned device positioning and navigation, surveillance equipments and medical diagnosis, which has considerable development prospects and very important applied and commercial values for the field of target tracking at real time. The Kamade-Lucas-Tomasi (KLT) target tracking algorithm is based on the optical flow method. The KLT target tracking algorithm is implemented on the OpenCV platform. The tracking effect testing is performed to the simulation experiment material video, and the tracking effect of the KLT target algorithm is tested again under the fixed and moving backgrounds. The error analysis is performed. Experimental results show that KLT target tracking algorithm has a good tracking effect, faster calculation speed, and it is robust, so it has a good development prospect.

Due to the development of liquid crystal display (LCD) technology, large-size and high-resolution thin film transistor-liquid crystal display (TFT-LCD) have emerged, and the dedicated timing controller (T-CON) is unable to meet the applications in special environments. In order to improve the performances of large-size LCD in special environments, a driving circuit for high-resolution and large-size LCD is designed. Field-programmable gate array (FPGA) is used as the core controller, supplemented by the necessary peripheral circuits to drive the large-screen LCD. At the same time, the circuit state monitoring, gamma online adjustment and parameter configurable functions are realized, which greatly improves the reliability and flexibility of the circuit. And the driving circuit is verified by experiments, and the effectiveness of the circuit is verified by experimental results.

A design method of XX2E analog projectile based on STC15W4K56S4 single-chip computer is presented. The structure design is consistent with the shape, weight and loading mode of the real projectile. The circuit control is not only the simulation of electrical characteristics, but also the design of human-computer interaction such as lighting, voice and sound effects. According to the fusing characteristics of bridge wire of electric igniter after XX2E live ammunition excitation, magnetic retaining relay is used as a path control switch, and the working state of contact spring of magnetic retaining relay is monitored in real time. Considering the training requirements, a series of practical functions, such as automatic timing filling and manual filling, fault elimination report number function, excitation current and excitation time reading function are added, which are close to the actual use of the equipment and the detection of the ignition path of the equipment. XX2E is not suitable for the installation of display screen. The actual training is mostly in the outdoor environment and the installation position is not easy to read through the display screen. Therefore, voice broadcasting is used to read all kinds of information. The practical application shows that the design scheme is easy to use, friendly to operate, stable and reliable.

The coupling synchronization problem between delay networks composed of neurons with external electrical stimulation is researched. Firstly, a class of neurons with external electrical stimulation is used to form a coupled delay network. Furthermore, by constructing appropriate Lyapunov-Krasovskii functional, the stability theorem and Lipschitz condition are used to design the adaptive law of coupling coefficient, and the synchronization condition of coupled delay network is obtained. Finally, the validity of the synchronization scheme is verified by simulation.

An optical fiber connection loss measurement scheme based on fiber Raman effect is proposed, and the calculation formula of the scheme is introduced. The accuracy of connection loss measurement for ordinary single mode optical fibers is simulated. Through this technology scheme, the loss of optical fiber connectors can be tested in work site of optical fiber fusion, so the efficiency of optical cable project construction can be significantly improved.

Laser coherent detection has higher sensitivity than that of direct detection, which makes it has outstanding applications in the short-range civil field and remote defense security. The applications of laser coherence measurement in defense and security are focused on, such as the classification and identification of camouflage or partially hidden targets, and the acousto-optical detection of buried mines. Combined with the current development of laser coherent detection in the field of in-vehicle automatic driving, the future development of laser coherent detection in the military and defense fields is forecasted.

Compared with the composite shaft double detection system, a single composite shaft detection system has the advantages of simple structure, low cost and high reliability, but its decoupling control complexity is a great technical challenge. In the laser countermeasure field for high precision tracking-pointing system, the complexity of the decoupling control is mainly manifested at two aspects of the coarse fine matching bandwidth of decoupling and coarse fine pointing alignment. Master of shaft alignment relationship transform problem is one of the core technology breakthrough difficulties, it’s accuracy determines whether the real-time tracking-pointing system error correction is optimal or not, which directly affect the tracking-pointing accuracy. Two common single detection methods are used as examples to illustrate the composition principle of the single detection compound shaft system and the importance of the pointing alignment. And the method of combining the least square fitting calculation with the verification of the special instrument is put forward to determine the high precision alignment parameters. High precision tracking-pointing can be achieved by integrating the decoupling matrix with the controller and implementing coarse fine decoupling control in real time. Field experimental testing and verification results show that the accuracy of this method can meet the system requirements. The fine tracking of the single detection composite shaft system is superior to 2 arc seconds. And the single composite shaft detection system achieving good tracking-pointing effect is verified.

The optical transmission platform based on new plug-in structure is researched. The embedded controller management mode is used to solve the problems of platform universality and extensibility. Using metal structure to shield electromagnetic radiation and the communication and electronic control failure caused by external electromagnetic interference source radiation and radiation interference between modules inside the platform are solved. At the same time, reasonable heat dissipation design is utilized to achieve the thermal balance in a short time, so as to solve the problem that the performance of optical components changes due to temperature changes. The performance testing shows that the optical transmission platform is convenient to use and maintain, has excellent electromagnetic shielding performance, and the internal thermal balance time of the platform is less than 15 minutes, which meets the requirements of practical industrial applications.