Abstract: The binary optical elements used in imaging systems have many advantages besides the features of saving in mass,volume and low cost.According to Schupmann telescope,a hybrid reflective and diffractive telescope with very large aperture about 25 m was designed,using two binary optical elements as its objective and eyepiece,and the diffuse spot size and MTF function of the telescope could meet requirements.Instead of ordinary diffractive lenses,multiorder diffractive lenses were introduced to improve the performance of the system,so that telescope could get broad bandwidth.Result shows that,the telescope can provide near diffraction-limited imaging with either single-band,multiband,or continuous coverage.

Abstract: The rain,snow,and fog in the atmosphere significantly affect the quality and reliability of atmospheric laser communication.The light polarization modulation with PPM is introduced.With this modulation method,we can control the intensity of the horizontally polarized light and vertically polarized light,and detect the polarizing angle of the received laser to encode.As the horizontally polarized light and vertically polarized light pass the same path,the attenuation effects of them can be counteracted while calculating the polarizing angle.Consequently,by using the light polarization modulation with PPM,it can reduce or eliminate the negative effects caused by atmospheric channels on atmospheric laser communication.The simulation results show that this method can not only eliminate the negative effects caused by atmospheric channels on the laser communication quality,but also increase the atmospheric laser communication code rate many times.

Abstract: The thermal property of high power flip-chip light-emitting diode(LED) was simulated and analyzed.The results show that the difference in temperature of the LED die are closely related with the shape and the distribution of solder bumps.The thickness of sapphire also affects the thermal property of light-emitting diode die.The comparison is given between flip-chip and conventional structure.

Abstract: The principle of UV nano imprint lithography(UV-NIL) and system designed by ourselves are introduced.A new device of bellows cylinder for parallelism was designed,and the principle is described in detail.With the design of the optical system based on it,the optical system's construction and adjustment are analyzed.At last,the nano-structures with 100 nm features are gained with this system.

Abstract: Currently the frame rate of most aerial cameras based on full frame CCD FTF4052 is less than 1 f/s.They are not competent for high speed application.To increase the frame rate some improvements were made on the basal driving circuitry of FTF4052.By using 4 outputs of FTF4052,a maximal frame rate of 3.4 f/s was achieved.The design for driving clocks,front end circuitry,DC-bias and camera interface for 4 outputs mode is presented.The improved circuitry is competent for many applications in aero photography.

Abstract: The effect of thermal conductive coating on the thermolysis property of LED lamps with different color and packing number used in a close under-water environment was studiedExperiment result shows that under the same situation the temperature of red LED lamps increases the slowest,then blue lamps,and that of the green lamps increases the fastest;the more the packing number,the quicker of the temperatures of LED lamps increase;the thermal conductive coating used on LED integrated circuit board can increase the thermolysis efficiency of LEDThe coating with higher thermal conductivity shows a better thermolysis propertyThe obtained data can offer a reference for thermal conductive coating thin films applied in LED packing

Abstract: Gauss-Laplace operator was used in the hybrid photoelectric joint transform correlator for image enhancement of joint power spectrumUsing hybrid photoelectric joint transform correlation can realize real-time detection,recognition and automatic localization of objects,but the images capture from practice have lower contrast and mass background noises,which affect the recognition rate of objectsAccording to the characteristic of Gauss-Laplace transform is not sensitive to Gaussian noise,and using adaptive threshold,boundary tracking,thin algorithm,we can filter the image noises,at same time,enhance the imagesIt can reserve the detail information of joint power spectrum,and improve the object recognition rate of optoelectronical hybrid joint transform correlation system

Abstract: In CCD signal acquisition system,reset noise becomes much more important compared with other noise sources at high pixel readout frequencies.According to CCD output noise characteristics,the noise transmission function and analysis model are established,and the reset noises is tested by using the most suitable correlated double sampling(CDS) technology.Experimental result shows that reset noises can be farthest restrained by selecting suitable sampling time.

Abstract: A kind of novel BiCMOS optically coupled isolation amplifier was designed and 2 operational amplifier circuits were given.2 bipolar junction transistors(BJT) were just set on the push-pull output circuit,but CMOS devices were set up for the rest parts.To improve the gain linearity and stability of the amplifier,negative feedback was introduced in the optical coupler part and each operational amplifier,and some measures such as components parameters optimization and speed-up were taken.The experimental results show that the ±3 dB bandwidth of the designed BiCMOS amplifier is increased by about 20 kHz than BJT optical isolation amplifier ISO100,and when the supply voltage of the inner operational amplifier is 8.6 V,the delay-consumption-product is 17.7 pJ and the gain linearity is increased by 5.5×10-5 compared with ISO100.So the designed BiCMOS amplifier is very suitable for high-speed communication system.

Abstract: Two types of InAs quantum dots grown in InGaAs/GaAs quantum well(DWELL) were fully investigated by time-resolved(TR) and temperature dependent photoluminescence(TDPL)Scanning electron microscopy(SEM) measurements show that the shape of quantum dots is prismatic,but not the common pyramid shapeWe consider that it is attributed to stress transition of multi-layer structure and anisotropy of InGaAs strained layerDWELL structures could combine both the effects of InGaAs buffer layer and cap layer and even effectively release the stress between the buffer layer and the QDs, which may greatly improve the QDs qualityStrong PL signal emitting at 1 318 nm can be detected at room temperature and the full width at half maximum of PL spectrum is only 25 meV at some temperature

Abstract: The stretched membrane with electrostatic curvature(SMEC) mirror is a new-style optical technology progressed currently.Its fundament is to use attractive force of electrostatic field to deform membrane film whose figuration is according to imaging requirements.Presently,the method of controlling the shape of SMEC mirror has not been leavened as a quantitative conclusion from theoretical analysis because of the difficulties of solving relation of attractive force of electrostatic field and deformation of membrane film.The functional relation of electrostatic voltage and other parameters which would influence the shape of SMEC mirror is given and this method is approximately deduced from the two supposes of parallel plate capacity and hemisphere mode of the deformation of membrane film could be available for the research of the SMEC mirror.

Abstract: Thermal management is the key issue for LED module design because luminous efficiency and lifetime of high-power GaN-based white LEDs are limited by heat dissipation.Temperature distribution of LED module under natural convection was simulated using computational fluid dynamics,and structure of fin for 5 W LED module was brought forward and optimized.Then,other key issues impacting heat dissipation were analyzed.The results show that junction temperature can be dramatically decreased by increasing thermal conductivity of attaching materials,and temperature characteristics of multi-chip package are superior to that of single-chip package both in junction temperature and chip temperature uniformity.The junction temperature of chip of the optimized module is about 60 ℃ under 5 W injection power.

Abstract: Silicon nitride(SiN_x) thin films were deposited successfully on SiO_2(SiO_2/Si(100)) substrates by plasma-enhanced chemical vapor deposition(PECVD).The SiN_x thin films were used for the supporting membranes of microbridge structure in uncooled focal plane array(UFPA).The microstructure and surface morphology of the thin films were investigated using X-ray diffraction,Fourier transform infrared spectrum and atomic force microscope.The thickness uniformity,stress and thermal stability of the thin films were tested by profilometry,stress analyzer and rapid thermal processor,respectively.The results show that the SiN_x thin films are amorphous,and Si-N is the main bonding structure of the films,in which there is a small amount of hydrogen.The thin films are smooth and compact,with good thermal stability and a lower compressive stress of 107 Pa.

Abstract: The polarization dispersion compensation performance of different modulation formats is studiedFirstly, the relationship between the signal's degree of polarization(DOP) and polarization mode dispersion(PMD) of different modulation formats is analyzed theoretically and numericallyThe results show that DOP sensitivity is different among the different modulation formats,because the change in data modulation format will often result in a change of optical spectrumSecondly,the PMD compensation performance with DOP as feedback signal of the mentioned modulation formats is studied via simulationIt is shown that the modulation formats with smaller bandwidth have better PMD compensation performanceIt is also shown that PMD compensation performance of DPSK is better than that of OOK,and that CSRZ,because of its specific spectrum characteristics,obtains better PMD compensation performance than that of RZCSRZ-DPSK combines the carrier-suppressed characteristic of CSRZ formats and specific spectrum characteristic of DPSK formats,thereby it has the best PMD compensation performance

Abstract: Noise in video signals will degrades the image quality.An adaptive temporal filter based on motion compensation is proposed for noise reduction.The noise in video sequence is tracked by motion compensation in temporal domain.The filtering strength can be adaptive changed on object motion situation.The experiment results show that the proposed filter is better than the filter in spatial domain.The noise in video signals can be effectively reduced and the image will not be blurry as the result of spatial filter.

Abstract: Using a simple experiment system,a measurement of recovery time(ΔTR) of erbium-doped fiber amplifiers(EDFA) is presented.The experiments demonstrate that ΔTR increases with the accretion of input signal power,while decreases with the accretion of pump power and it is independent of transmission speed.

Abstract: In order to obtain the experiment information of light intensity distribution with divergence,a new measurement is introduced.The system is composed of three parts,rotary device,angle detector,and optical intensity detector.In the experiment,this method was used to draw the curve of the intensity distribution of transmitted beam of multimode optical fiber.The experimental result show that the Gaussian beam can be used to well describe the light intensity distribution,moreover,numerical aperture(NA) of fiber can be obtained directly from the figure,which prove that this method is reliable and credible.

Abstract: The importance of using laser range on the electro-optical theodolite is described,which could measure the position of target with only one theodoliteThe theory and equation of laser range were analyzed,and at last,according to the structure of electro-optical theodolite,the optical system of laser range was designed

Abstract: Experimental investigation on a closed-loop micro jet cooling system for high power LED thermal management was conducted.Therocouples were packaged into the LED substrate to obtain the temperature distribution,which was used to evaluate the cooling performance of the micro jet cooling system.The experimental results show that with 2.45 W input power for LEDs,the LED substrate temperature increases to 72 ℃ from the environment temperature of 25.6 ℃ in one minute when there is not any special cooling means.However,when the present micro jet cooling system begins to work,its temperature decreases to 34.81 ℃ quidely even with 9.3 W input power and corresponding 14.53 W/cm2 heat flux density,the micro jet cooling system can still keep the LED substrate temperature at 54.34 ℃.

Abstract: ZnO thin films were prepared by electrodepositing method on transparent conducting glass substrates.The influence of deposition current on the structure and optical properties of the films was studied.XRD analysis demonstrated that the nanocrystalline ZnO thin films had wurtzite structure,the grain size of the samples decreased with the increase of the deposition current,and the preferential orientation of the film changed with the increase of the deposition current value.Optical characterizations showed that the maximum value of optical transmittance of the films was up to 84%,and the optical bandgap energy value was about3.3 eV,irrespective of the cathodic current value.

Abstract: Characters of image sensor's photo response non-uniformity(PRNU) are analyzed.According to the ideal photo response of image sensor,a new method to correct image sensor's PRNU is proposed,which corrects image sensor's PRNU in three steps.Firstly,correct non-uniformity of all pixels under a fixed irradiance with least square method;secondly,acquire the real photo response curve of every pixels and ideal response curve under varying irradiances with least square method;at last,correct every pixels under varying irradiance through linear correction.Experiment results show that the proposed algorithm is effective to the correction of image sensor's PRNU,and that it has advantage in engineering implementation for the simpleness of the algorithm.

Abstract: Based on machine vision techniques,the automated reading techniques of mercury thermometer were studied. According to the basic principle and working process,the selection of lens,imaging sensor,lighting source and algorithms were presented.An experiment system was developed and the on-site experiments at 0 ℃ and 100 ℃ were finished. The experiment results show that this reading technique can achieve total automated measurement and it offers high precision and efficiency,which shows the potential applications in industry.

Abstract: Indium tin oxide(ITO) films were deposited by DC magnetron sputtering system and experimentations were scheduled by orthogonal test table L32(48).Sheet resistance and transmittance of films were tested.Effects of eight parameters on electrical and optical properties of the films were analyzed in detail.Three factors including deposition pressure,flow ratio of argon to oxygen and annealing temperature had greatly influence on conductance of ITO films.Best parameters about sputtering ITO were:deposition pressure 2×133.3224 mPa;Ar∶O2 16∶0.5;annealing temperature 427 ℃;gap 15;annealing time 1 h;power 300 W;annealing in vacuum;deposition temperature 227 ℃.Sheet resistance,transmittance in visible region and resistivity of the films prepared with the above parameters were 17 Ω/□,85.13%,1.87×10-4Ω·cm,respectively.

Abstract: The development of noise attenuation technologies for CCD imaging sensor is fully summarized,which emphasized on the noise attenuation technologies for CCD reset noise and non-uniformity correction technologies for CCD sensor.The digital double slanting integral technology with tap-weights for CCD reset noise attenuation,scene-based non-uniformity correction for CCD imaging sensor and non-uniformity correction for multiple CCD imaging system are introduced and analyzed specially.Finally,the developing trend of noise attenuation technologies for CCD imaging sensor are discussed.

Abstract: An integrated high-power LED using semiconductor refrigeration technology to dissipate heat is introduced.This semiconductor refrigeration encapsulation structure of high-power LED which is based on the principle of Peltier effect can not only cool the high-power integrated device apparatus,but also enable the apparatus to work properly in unfavorable environment such as high temperature and tremor.Thus the semiconductor can broaden the application field of LED and extend the validity of high-power LED at the same time.White-light LED packaged in this technology have stable luminescence,small attenuation and extended lifetime.

Abstract: In order to real-timely and accurately measure thread parameters such as thread angle(tooth-type half-angle),screw-pitch,lead,thread height,major diameter,minor diameter,pitch diameter,helix angle etc,and enhance the measuring accuracy,a non-contact thread parameter measuring system based on an array CCD was designed and achieved.And its optics imagery,preprocessing of images,edge detection,sub-pixel location and camera calibration were emphatically investigated,test and analysis software was excogitated,and corresponding experiments were studied.The results obtained indicate this system has advantages such as quick test,high precision and good repeatability.

Abstract: From the point of view of solving the heat dissipation and the matching between heat expansion coefficients of the materials for high power LEDs,the package structure and the performances of several types of metal core printed circuit board(MCPCB) have been presented in detail as well as a brief analysis on the conception of heat dissipasion.A special MCPCB fabricated by plasma electrolyte oxidation(PEO) is introduced,which is characterized by low cost,good electrical isolation,excellent thermal transfer and its convenience for package processes.And finite element method(FEM) has been used to simulate the temperature distribution in watt-level single-chip LED model.The results show that the thermal impedance of the LED devices reduces from 10 K/W to 6 K/W when the thermal conductivity of the plasma microarc oxidation(MAO) film rises from 2 W·m-1·K-1 to 5 W·m-1·K-1.

Abstract: Based on the characteristics of beam propagation of laser diode array(LDA),high power diode laser was coupled to a wedge-shaped fiber array.Finally,high output power of 32.48W of the fiber optic coupled module of LDA is achieved,and coupling efficiency is 81.2%;the diameter of every fiber is 200μm,amount of fiber optic is 19,and number aperture is 0.12.

Abstract: In the process of optoelectronic theodolite real-time interactive simulation,the high frame virtual image distortion can't be avoided because of the limit of hardware process capability.An interactive superposition algorithm is proposed for virtual image based on comparability theory.In the process of real-time simulation,the target image which was simulated beforehand can be superposed on the background image which was also simulated beforehand,after rotating and translating.This operation can ensure the interactive character of simulation,at the same time,the romance quality of virtual image can be improved highly.Guided by perspective projection model,an algorithm is given to calculate translation amount and rotating amount.Simulation results show that the superposition image has the same character with the actual simulation image.