The operation principles of typical fiber lasers are introduced. With the advantages of good mode, small volume and non-cooling comparing with other lasers, they are paid more attention in many application areas such as communication, military technology, industry processing, medicine and optical information technology. The development progresses of foreign fiber lasers such as continuous wave (CW) fiber laser and pulse fiber laser are reviewed. Furthermore, the industrialization trends of fiber lasers are summarized.

With the continuous improvement on the performance of air-to-air missile and the application of various portable guidance and non-guided munitions, the threats faced by military aircraft are further complicated and serious. Active protection system has the unique advantage of actively destroying incoming threats, which can transformative improve the self-defense capability. The concept of the airborne active protection system, the development of the technology and equipments in foreign countries are imposed, which provide references to airborne self-defense development in the future.

The development of virtual-real illumination combing technology in augment reality area in recent years is summarized. The main categories of these technologies are described. Illumination estimation technology, research on virtual-real illumination consistency based on equipment acquisition and scene understanding are introduced. And the domestic and foreign research actualities are illustrated. Furthermore, some technology difficulties for virtual-real illumination consistency research in augment reality are analyzed. The existing solutions are summarized. The development trends of the research are also forecasted.

Aiming at the non-destructive, online and fast portable detection requirements of dried pericarpium citri reticulatae, a handheld non-imaging spectrum analyzer is designed based on the visible-near infrared spectroscopy technology using the AS7341 sensor. The analyzer uses STM32 microcontroller as the main control chip, which has various functions such as network connection, storage and display. The software and algorithm are designed for the microcontroller, which realizes the acquisition, processing, display, storage and transmission of spectral data. The experimental verification is carried out with different years of pericarpium citri reticulatae as the detection object, and the results showed that the accuracy rate of year identification of pericarpium citri reticulatae in the testign set is not less than 97%, which has practical application value.

Airborne IR decoy plays an important role in modern air war. Anti-jamming technologies of air-to-air IR guided missile are introduced. The development and equipment of new foreign airborne IR decoy technology are discussed. The importance of airborne IR decoy in modern air war is indicated. According to the anti-jamming technology of IR guided missile, the design principle of airborne IR decoy is introduced. And the development of IR decoy technology in future is forecasted.

In order to meet the technical requirements of simplifying the laser optical path of multi-band laser equipment, two materials such as ZnS and YbF3 are selected to complete the design of long-wave and short-wave infrared beam combiners under the condition of 45° incident on the ZnSe substrate. The correction coefficient is introduced, and the measurement spectrum is analyzed. The reason for the inconsistency with the design curve, and the error is solved in combination. When the incident angle of the final beam combiner is 45°, the transmittance in the (10.6±0.2) μm band is more than 95%, and the reflectivity in the (780±10) nm, (808±10) nm, (880±10) nm, (915±10) nm bands is more than 97%, the transmittance in the 630~680 nm band is about 41.825%. The prepared beam combiner has good environmental adaptability and meets the technical requirements of the system.

According to the research on Sagnac effect and the interference structure of fiber Sagnac loop, the improved schemes of fiber Sagnac loop are introduced in recent years. The plenty of experiments are implemented and the application range is enlarged greatly. Based on the basic principle of Sagnac effect, the main applications and newest developments of fiber Sagnac loop at present stage such as fiber gyro, fiber hydrophone and Sagnac loop filter are summarized. The advanced and new technology directions of fiber Sagnac loop such as changing the structure of Sagnac loop, adding medium to Sagnac loop, cascading with other structure, making full-light cache and multiple-wavelength fiber lasers are introduced finally.

In order to meet the requirements of optoelectronic devices for the use of windows, a multi-band infrared antireflection coating based on zinc selenide is designed. In order to achieve the purpose of multi-band anti-reflection, zinc sulfide and ytterbium fluoride are selected as high and low refractive index materials respectively, and the same multi-band infrared anti-reflection film is coated on the front and rear surfaces. Finally, the transmittance at 0.808 μm, 0.880 μm, and 0.915 μm is more than 91%, and the transmittance at 3.7~4.8 μm and 10.6 μm is more than 95%, and the film layer has good environmental adaptability.

Focusing on the unneglectable error of testing results for the rough surface material by the PG model, the basic model assumption, modeling process, parameters inversion and fitting results are analyzed, and the cause for the error is found out. Taking the physical fact that evanescent wave existing in the fine structured surface as the basis, and ignoring the penetration depth and phase delay, a new assumed surface configuration which is integrated into micro-hemispheroid is created. Then, a new reflectance function is built, the inner scatter function is refined, and a new pBRDF is established. Illuminated by full spectrum light in a laboratory, the spectrum testing data of dual-directional reflectance for surface is acquired, and the performance of the PG model and the new model is compared. The result indicates that the new model error in the radiance and the DOLP is respectively about 35% and 59% of that of the PG model.

Automobile headlamp is an important part of automobile, which can provide road surface lighting in front of the driving direction for drivers and guarantee driving safety. It usually includes three parts such as light sources, reflectors and lenses. Principles of the three parts, domestic and foreign research progress, relative rules, light distribution testing and the classification of headlamps are introduced respectively. The designs of new LED headlamp are analyzed. Common design process of automobile headlamp is summarized. A popular adaptive front-lighting system (AFS) at present is introduced.

At first, the development history of gas waveguide laser, hollow-core optical fiber gas lasers and solid-state waveguide laser is reviewed. And then, the working principles of the two kinds of lasers are introduced respectively. At last, the future research is prospected and analyzed according to the development status of the two kinds of lasers.

The imaging system with long focal length, multi-spectrum and light weight has the advantages of high resolution and small volume, which is an important research direction in imaging system design. According to the large shelter in cooled infrared coaxial three-mirror, an imaging system with the improved coaxial three-mirror is introduced. A piece of mirror is added behind the third mirror, the light from the system is reflected by the mirror. Off-axis aberration is corrected by second surface coefficients of three pieces of reflective mirror. The detailed design ideas and relative problems are given. A design example with 400 mm focal length, 4 F/# and 1.72° full field of view is given. The result shows that the imaging quality of the system approaches to diffraction limit.

GaSb-based diode lasers are the main method to cover mid-infrared waveband. As have been studied many years, GaSb-based diode lasers are developed enough for practical applications. For having the vast majority of gaseous molecules exhibit strong absorption lines and higher transparency atmospheric window, GaSb-based diode lasers have important applications in gas detection, material processing and free space optical communication.

Infrared search and track (IRST) system with the characteristics of long detection range, good camouflage and low error rate becomes the best detection equipments in the air and on the sea. According to the multispectral demand of IRST system, an IRST optical system with dual-band common aperture is designed. The system is better than the single-band system in the area of acquiring information. The obtained MWIR and LWIR images can be fused together so as to take the advantages of MWIR and LWIR synthetically. Effective reconnaissance probability is enhanced and false alarm probability is reduced. Total focal length of the system is 400 mm, F#=2 and field of view is 2°. The clear imaging in 3~5 μm and 8~12 μm with dual-band common aperture is realized by dispersive RC system. Second imaging is performed on a medium wave system for suppressing thermal radiation stray light from medium wave. Design result indicates that excellent quality images can be produced by the system and the operation requirements of IRST system can be met.

Pulsed laser diode (LD) pumped passively Q-switched microchip laser is the most effective technique for miniatured large energy sub-nanosecond laser pulse generation. Here, the first pulse established time, time interval of the multi pulse, as well as the influence of the pump energy and pulse width on the output laser pulse number of the pulsed LD pumped passively Q-switched microchip laser are analyzed based on the rate equation theory. And YAG/Nd:YAG/Cr4+:YAG microchip laser pumped by a pulsed LD is established on this basis, in which the near-diffraction limit sub-nanosecond pulse laser at 1 064 nm is demonstrated with the single pulse energy of 1.2 mJ, the pulse width of 574 ps, the peak power of 2.1 MW, and the beam quality factor of M2=1.21.

The auto location control to spectral scanning of sample detection is one of the key technologies of fast biochemical detectors with multi-parameter. According to fast micro-biochemical detectors with multi-parameter researched by Chongqing University based on micro-spectrometer, the design of auto-location control systems for multi-parameter sample detection spectral scanning is referred and finished. And an online debugging experiment research on multi-parameter fast micro-biochemical detectors based on the control system is developed. Experimental results show that the variation coefficient of sample detection absorbance CV is equal and less than 1%, the linear coefficient of absorbance R2 is equal and more than 0.995. And the relative technology requirements of semiautomatic biochemical detector are met.

Focusing on the interference problem of subsequent detection from highlight on metal surface in the process of 3D laser detection, a peak continuity detection method is proposed. Firstly, gray peak in each column is extracted according to the gray information in gray images. Then, the peak validity is estimated based on laser stripe continuity to remove false peak and maintain the valid, and the effect of highlight can be removed. Finally, experimental results are verified by detecting standard step block. The results show that the reconstruction accuracy after highlight processing is enhanced nearly 50% corresponding to the reconstruction results of common refinement treatment, and the validity of the method is verified.

The existence of space debris seriously threatens the safety of spacecraft in orbit and causes a serious waste of limited orbital resources. Picosecond laser detection is the development trend of high-precision space debris laser ranging. However, the high peak power of a picosecond laser in single-pulse operation can easily damage optical devices, and it is difficult to further improve its energy and power. When operating in pulse burst mode, the high energy is dispersed to each pulse, which not only reduces the energy of every single pulse and avoids device damage, but also makes it possible to further improve the output power. Therefore, the pulse burst picosecond laser has played an important role in the detection of space debris, and has attracted extensive attention in recent years. Pulse bursts generation method and laser are summarized, which provides technical references for researchers engaged in ultrafast picosecond laser and the application of ultrafast picosecond laser.

Phase generated carrier (PGC) demodulation technology is a kind of homodyne demodulation algorithm widely used in interference fiber sensor systems. The definition and modulation principle of PGC are introduced briefly. Different kinds of demodulation algorithms are analyzed and the results show that the demodulation signal is affected by the amplitude of interference signals and modulation depth. The distortion of demodulation signals is greatly decreased by eliminating these impacts. Moreover, the sampling frequency can be reduced by using the mixing carrier with lower orders. The results have significant theoretical reference value on the demodulation technology of interference fiber sensors.

In the field of sensor, especially distributed fiber sensor, the primary signal has the characteristics of weakness and periodicity. After passing through the receiving circuit, the signal is distorted unavoidable and the following signal processing will be influenced greatly. On the basis of theory analysis of the receiving circuits of weak and periodic signals, a self-adaptive processing algorithm based on weak periodic signal is proposed. The algorithm is used to process receiving signals so that the distortion of output signals is reduced greatly. A common processing method for optimizing and compensating output signals is realized.

Laser radar has played an important role in various fields since it came into being. At first, the development course of laser radar technology is reviewed. And then, the basic working principle is expounded, and the applications in the atmospheric sounding are listed. At last, the technology problems of laser radar are pointed out, and the development is prospected.

Larger frequency estimation error will appear when a peak spectrum line phase is closed to using frequency interpolation algorithm based on the real part of fast Fourier transform (FFT) coefficient. So an improved sine signal frequency estimation algorithm is proposed. The postion of peak spectrum line is firstly indexed by using the real part and imaginary part sequence of FFT coefficient. And then according to the phase of peak spectrum line, the sequences with larger amplitude in real and imaginary part sequences are selected to participate in frequency interpolation. Simulation results show that at the condition of SNR=3 dB and sampling number N=128, the root mean square of normalized frequency estimation error at the whole frequency band is less than 0.02 and closed to Cramer-Rao lower bound (CRB). The total performance of the improved algorithm is better than the frequency interpolation and Rife algorithm based on the real part of FFT coefficient. The improved algorithm has the characteristics of high frequency estimation precision and few computation amounts and it is easy to implement in hardware.

Computational imaging, as a new imaging technology, has attracted more and more attention from researchers. The technical characteristics of computational imaging are summarized and analyzed, its technical advantages are expounded by comparing with traditional imaging methods, and some outstanding applications of computation imaging technology in photoelectric field are listed. With the rapid development of information processing technology, the photoelectric field has put forward higher requirements for imaging detection. In the end, according to the future application requirements, some prospects of computational imaging in the photoelectric field are proposed, which is expected to open up ideas for researchers in related fields.

According to the characteristics of cable arrangement environment and application requirements, a new design method for an early alert system of all-fiber power cable fault location is introduced. The fiber combined with power cable is used as sensors in the system. Electric leakage fault from power cable is monitored and located in real time by collecting and analyzing the vibration waveforms around power cable. Experimental results show that the vibration around power cable along fiber line can be monitored effectively by the system. And measuring distance is more than 20 km and locating accuracy is ±3 m.

The effect of smoke screen, whichrelative humidity; smoke screen; infrared; ultrafine graphite powders; electro-optical countermeasure is an important passive jamming means to improve the protection ability, is closely related to relative humidity (RH). The attenuation rates to 3~5 μm and 8~14 μm, settling velocities, and mass extinction coefficients of ultrafine-graphite-powder-based smoke screen under different RH are respectively measured on a humidity-controllable smoke-box experimental system, which revealed the impact of RH on the infrared interference characteristics of smoke screen. At lower RH, ultrafine-graphite-powder-based smoke screen exhibits a higher infrared attenuation rate, and a slower decrease of attenuation rate over time. With the increasing of RH, the settling velocities of smoke particles initially increase and then decrease, with a maximum settling velocity of 1.04×10-3 m·s-1 at 50% RH. The experimental results ma nifested that a decrease trend in mass extinction coefficients of ultrafine-graphite-powder-based smoke screen is associated with increased RH. The mass extinction coefficients of such smoke screen to 3~5 μm and 8~14 μm infrared at 28% RH are 2.12 m2·g-1 and 1.41 m2·g-1, which are higher than those of at 70% RH by 11.12% and 10.05%, respectively.

A state detection system with multiple independent channels in electronic equipments based on PAT128 and a current monitoring system in real time are introduced. The operation states of multiple independent channels are monitored by modularity circuit design in the system. And operation current is monitored in real time. Whether the preliminary functions can be finished or not by the multiple independent channels in electronic equipments is confirmed. And good testability design of the electronic equipment is well shown.

In this experiment, graphene suspensions are prepared by high speed shearing method, and the prepared graphene is characterized by scanning electron microscopy (SEM), Raman spectroscopy and UV absorption characterization. The results show that graphene solution with good water dispersion can be prepared by this method. Further, nano-silver and graphene solution is prepared by photothermal conversion of nanomaterials. The photothermal conversion characteristics of the nano-silver and graphene solution prepared under the action of different laser powers are investigated. The temperature of low concentration sample solution can reach 28.2 ℃ under the action of laser with wavelength of 808 nm and power of 300 mW for 15 minutes. In theory, the enhancement effect of surface plasmon resonance of nano-silver with different particle sizes on the photothermal conversion performance of graphene is simulated by using finite difference time-domain method. The simulation results are in good agreement with experimental results. In addition, photothermal conversion stability and thermal equilibrium time constant of solutions are compared and analyzed, which proves that the nano-silver and graphene solution has good stability of photothermal conversion.

Semiconductor laser is widely researched and applied with the characteristics of small size, light weight, low drive power and current, high efficiency, long operation life, being directly modulated, easy to be integrated with optoelectronic devices, being compatible with semiconductor fabrication technologies and mass-produced. Researching and improving laser driving circuits have great significance. Small power tunable semiconductor laser has particularly high requirements on driving current, small changes in the driving current will directly lead to the fluctuations of output light intensity. In order to achieve a stable output power for semiconductor laser, a constant current driving circuit containing slow start and current limit protection circuits is designed based on current negative feedback principle. In the circuit design, simple devices and design are used as possible to improve the normal operation of lasers. In modulation process, low-frequency distortion and high-frequency switching modulation circuits are designed based on the different characteristics of amplifiers and triode respectively. The feedback current is modulated based on the principle of two amplification negative feedback. The bandwidth of closed-loop is lowed and the stability of closed-loop negative feedback is enhanced.

Halide perovskite (ABX3) materials have strong application potential in memristor materials due to their ion migration and charge trapping effects. Due to the low formation energy and weak binding strength between lead and iodine atoms in Cs0.05(FA0.85MA0.15)0.95PbI2.55Br0.4, iodine ions are easily lost from the perovskite lattice, resulting in defects and unsaturated lead atoms. Research on the field of solar cells has shown that by introducing triiodide ions, the defects in perovskite films can be significantly reduced and the film quality can be significantly improved. Therefore, different amounts of iodine are added to the perovskite precursor solution to introduce triiodide ions to explore its effect on the perovskite memristor being composed of Cs0.05(FA0.85MA0.15)0.95PbI2.55Br0.4. Experimental results show that by adding different amounts of iodine, the memristor curve has three obvious changes, such as the current in the I-V curve shows a gradually decreasing trend, the mutation performances of the memristor SET and RESET change significantly, the switch ratio varies greatly. The influence of the introduction of triiodide ion on the perovskite memristor is studied to adjust the current and switch ratio of the perovskite memristor, so as to be suitable for different application fields, and provide a direction for improving the performances of the perovskite memristor in the future.

Star target detection is influenced by many environmental factors during daytime. Star target detection at the condition of different parameters is analyzed in an ideal environment and the presence of clouds. Infrared radiation is also influenced by uncertain factors such as rain and fog except the main influence factor such as clouds during the transmission in atmosphere. These two uncertain factors are researched. The presence time of rain and fog, place and height are all uncertain factors. Incorporating with the existing experience formulas, radiation attenuation states at the condition of different parameters are analyzed. The influence from rain and fog on radiation transmission is quantified.

Pulse laser emitted by a high power semiconductor laser is used as an exciting source to make the temperature rise on the surface of the calibrated thermocouple. The temperature change signals are detected by a fast-response infrared detector and the calibrated thermocouple simultaneously. The frequency response of the infrared detector is better than that of the calibrated thermocouple, the previous measured value is used as a true value to calibrate the latter dynamic calibration system. An ordinary K-type sheathed thermocouple is calibrated dynamically by the system, a temperature-time curve of the infrared detector and calibrated thermocouple is obtained. The thermocouple’s dynamic compensation is modeled with a dynamic compensation filter, the order and parameters of the filter are determined based on the measured digital curves and the model structure is defined. The correctness of the model is examined by cross-validation method. Experimental results show that the dynamic error of the thermocouple is reduced by means of the dynamic compensation model, which brings it closer to the actual value, and the ordinary K-type sheathed thermocouple compensation curve is given.

Roof prism has the functions of turning light path, image rotation, directional reflection, shortening system light path and so on, which is widely used in aiming systems. In the optical system of visual optical instruments, ridge prism is often used to transform the image in order to obtain complete consistent images. Compared with other prism or lens groups, roof prism has the advantage of small volume. High precision roof prism has high requirements in its angle error, surface error and surface roughness. How to obtain high precision and reduce production cost is a difficult problem in the optical manufacturing industry in recent years. A polishing process to control the accuracy of ridge angle is mainly introduced, in which the way of light glue plate, the influence of ridge surface shape on ridge angle and the rework method of ridge surface are analyzed, and the control of ridge angle accuracy of high-precision ridge prism is expounded.

IR imaging guided missile has been developed widely, special material decoy against it is produced. Based on the jamming theory of special material decoy, combining with operation principles and anti-jamming methods of IR imaging guided missile, on the basis of MJU-50/B special material decoy of America, the motions and infrared radiation models of airplane, IR imaging guided missile and airborne special material decoy are built. Simulation of special material decoy in spatial countermeasure is realized. And the characteristics of airborne special material decoy are summarized and analyzed.

In the wireless ultraviolet (UV) light communication network, the effective networking method suitable for it can further improve the network performance such as information transmission quality and network coverage. A novel networking method for wireless UV-optic cooperative communication is proposed. Based on the wireless UV-light cooperative network model, a network node cooperative communication strategy is designed. The amplification-forwarding and decoding-forwarding methods in the multi-relay environment are studied. The error rate, communication range, transmit power and network performance gain of the UV-optical cooperative network under different relay and forwarding methods are verified by the simulation results. The research results show that the multi-relay cooperative communication can effectively improve the performance of the wireless UV optical communication network. Under the condition of the same bit error rate, the communication range of the UV light cooperative network using amplification and forwarding and decoding and forwarding is obviously better than that of the non-cooperative network, and the required transmission power is lower. The decoding and forwarding method is better than the amplification and forwarding method, and the more the number of cooperative communication nodes, the greater the communication range of the wireless ultraviolet light cooperative communication network.

According to the problem of temperature drift during pressure test in oil and gas well, the high temperature test in oil well is simulated and the conclusion of temperature drift generating in the process of oil well pressure test is obtained. After perforating, much of heat is released, at the same time, the high-pressure gas pulse is generated in the well and the sensitivity of the sensor has a big uncertainty. Incorporating with downhole environment and temperature drift phenomena from piezoresistive sensors, temperature compensation shall be performed during downhole pressure test so that downhole pressure signals can be measured accurately. Software compensation technologies are used to compensate temperature drift during test process according to experimental data.

In order to study the launching tactics for the protection system of vehicle-mounted rocket smoke bomb to realize continuously shielding and protecting its own side target with minimum bomb consumption, when the protection system defends its team from the assault of reconnaissance and striking integrated unmanned aerial vehicle (UAV), the model of smoke bomb defending UAV with its team for numerical simulation is established. The simulation model has considered the influences of horizontal wind and UAV movement on launching parameters such as azimuth, pitching angle and explode time delay, and the wind induced ballistic deviation is corrected, the wind drift area of smokescreen is compensated. The bomb consumption of different launching parameters considering UAV movement is worked out. According to the analysis of simulation results, when defending reconnaissance and striking integrated UAV, the protection system of vehicle-mounted rocket smoke bomb, acting as part of terminal defense force, can usually realize continuously protecting its nearby targets with minimum bomb consumption, through selecting the smallest pitching angle, in the premise of ensuring that smoke bombs are able to be launched to the area that should be covered by smoke.

MATLAB/Simulink is a good system modeling and algorithm simulation tool and Modelsim is the most commonly used HDL simulation tool in China. Modelsim can cooperate with Simulink using Link for modelsim. And the algorithm design and validation are finished in the same software so that compatibility issues under different development environment are avoided, design complexity is simplified greatly and development process is advanced. The design method based on models is introduced. The algorithm with hardware can bring great convenience to algorithm development and subsequent hardware implementation. The interface technology and model building of Modelsim and MATLAB/Simulink united simulation are introduced. And the validity of the system is verified by the application example of 16 QAM modulation and demodulation.

Firstly, aiming at the chattering and slow convergence caused by the common sliding mode approach rate in the sliding mode control of the photoelectric stabilized platform and the suppression of the perturbation of the system moment of inertia, a state error approach rate based on the exponential approach rate is proposed, which introduces the system state and tracking error. The system state point reduces the error in the sliding process, so the control gain gradually decreases, when the error is within the allowable error range, it is stable near the origin, which reduces the jitter and accelerates the convergence speed. Secondly, aiming at the inevitable torque disturbance caused by the low speed of the frame system when tracking the photoelectric stabilized platform, an adaptive sliding mode control method based on LurGre friction model is proposed, and an electromechanical servo control model including the friction model is established. Finally, the stability of the controller is verified by Lyapunov function, and Matlab simulation shows that the controller has stronger robustness, better tracking accuracy and anti-interference ability than that of the traditional control method.