In this paper, the diamond film's advantages and disadvantages as a particle detector are analyzed. The techniques of fabrication, the mechanism of the detector, the configurations of its electrodes, as well as the level of development, are introduced. Meanwhile, a diamond film particle detector has been successfully fabricated in our laboratory. The detector performance was tested by measuring the energy spectra of α-particles emitted from an 241Am source and the response to X-ray. The obstacles of realizing detectors with high performance are also pointed out.

In this paper we have aimed our discussions at a survey of the development of L-band EDFA in recent years. Its principles are discussed by analysing EDF and pump source which are the two key technologies. Many novel designs are presented here, as well as some C+L band EDFAs. Several research issues are also proposed in this paper.

Using the superoperator methods, we solve the master equation for a two-level atom in a squeezed thermal reservoir. The density operator of the systems is easily obtained from any given initial state by using this methods.

The aberration characteristics of the optical system of a single conic reflector and a two-lens null corrector are discussed. The conditions of the absence of aberrations are analyzed based on the third-order aberration theory and the influence of obscuration ratio and the corrector's single lens' power to the system performance is investigated. Best choice of the ratio and the single lens' power is also given.

It is pointed out that the methods of the approximate treatment of the Fraunhofer diffraction under spherical wave illumination in literatures [1-7] are not very proper. The Fraunhofer diffraction formulae, which describe the diffraction pattern received by an observing screen that is located at the convergence or divergence center of an illuminating spherical wave and is parallel with the diffracting screen, are deduced from the Rayleigh-Sommerfeld formula of the scalar diffraction theory. The scope of application of the formulae is discussed in detail. On the condition that the diffracting distance satisfies the far-field condition, it is pointed out that the formulae are tenable even if either the center of the lighting spherical wave or the observing point, or both, are located in the non-paraxial region. When the diffracting distance is nearer, the formulae are only tenable in the nearby region of the center of the illuminating spherical wave, but the center may be in the non-paraxial region. However, the further the diffracting distance is ,the bigger the tenable region is.The formulae may be reduced to the results presented in literatures[1],[6]and [7] in the particular case that the illuminating source and the observing point are all close to the axes.

In this paper, we introduce an all-solid Nd:YVO4 laser sysytem, the output laser at 10G4 urn is studied, a Cr:YAG crystal is used as the passive Q-switching element and a KTP crystal as iutracavity frequency doubling in the cavity to obtain Q-switched laser output at 532 nm. the pulse width is about 40 ns, the output power is about 107 mW and the frequency is about 12 KHz.

A design of LD-pumped, high efficient and single-mode Nd:YVO4/LBO red laser at 671 nm was presented in this paper. Using a Brewster plate, with the birefringent effect of a type-II critical phase matching LBO crystal, mode selection was performed. With 800 mW incident pump laser, single-mode red laser up to 37 mW was obtained at last.

By using Czochralski method high quality GGG single crystals up to 35 mm in diameter and 70 mm in length have been grown. We described the crystal growth technology in detail and discussed the influence on the crystal growth of the atmosphere in the furnace and the shape of the crucible.

The theoretical conversion efficiency of the second harmonic generation of the flattened Gaussian beam's and Gaussian beams was obtained by using the numerical simulation on the crystal CsLiB6O10 in the phase matching type I and type II for the first time. The conversion efficiency versus the crystal lengths, polarization ratio and intensity of the pumping light are given out in this paper, it is pointed out that the SHG conversion efficiency 78.5% of the flattened Gaussian beam is higher than that of the Gaussian beam 69.1% in the type II and the other condition.

In this paper, synchronization for unified chaotic systems with different parameters has been achieved by designing an appropriate parametric adaptive control and feedback control. When the two systems are synchronized, the parameters and the variables of the response system are in good agreement with those of the drive system, and the parametric adaptive control law will automatically disappear.

The equal-order Y-squeezing effects of photon field for the excited two-mode squeezed vacuum state a+mb+m|ξ) are numerically studied. It is shown that the photon field can exhibit the equal-order K-th power Y-squeezing effects (K = 1. 2,3,4, 5,…), and as m increases, the equal-order K-th power Y-squeezing effects increase.

The relative models of laser echo identities and terrain object identities are researched in this paper. The laser echo identities of a variety of terrain objects are discussed. A method of getting characteristics of the objects by searching table is put foreward and an emulational result is gained.

The excimer laser has shown a rapid development from the laboratory to its current clinical use for refractive surgery. Operating at 193 nanometers, the excimer laser is able to sculpt the corneal surface meticulously, altering the surface optical architecture to correct refractive errors. Such surgery is achieved with minimal mechanical and thermal effects upon the remaining corneal tissue. We studied laser and tissue interactions, investigated the effect of laser spot size and beam profile on the outcome of corneal surface smoothness and determined the relationship between the fluence of ArF excimer laser and the cornea ablation rate. The block diagram of ophthalmic excimer laser system and it's principle have been described. Finally, we tested ablations on polymethylmethacrylate (PMMA) and applied them to clinical operations with the satisfied results.

Randomly varying birefringence in optical fiber can lead to pulse broadening, corresponding to polarization-mode dispersion (PMD) effect. Here the interaction between random birefringence and Kerr effect is investigated numerically about dispersion-managed (DM) soli-ton. In zero-averaged-path dispersion managed optical fiber links, because linear dispersion is full compensated, the Kerr effect becomes a detrimental factor in the transmitting system of DM soltion and makes optical pulse narrower. However, when random birefringence is considered, Kerr effect appropriately resists pulse broadening induced by PMD. Systems performance can be improved greatly, as long as PMD is compensated by the nonlinear effect through suitable birefringence parameter and systems power. In addition, considering polarization-dependent losses (PDL), the results show that the fluctuation and broadening of pulse width arc very large even with little loss difference in two polarization directions. So, PDL must be considered in high-bit-rate optical fiber communication systems.

Judgement for mode-exciting of photonic crystal fiber is denned by introducing cladding-effective-index. Using a finite element method, cladding-effective-index and effective mode-index are accurately calculated, and mode distributions in different photonic crystal fiber of various wavelength light are given, the results are consistent with the experiments.

Self-phase modulation (SPM), intrachannel cross-phase modulation (IXPM) and intrachannel four-wave mixing (IFWM) in dispersion compensated high speed optical communication systems are researched, and the role of the symmetrical perturbation induced by SPM, timing jitter induced by IXPM and amplitude jitter and ghost pulse induced by IFWM are analyzed. The stable transmission of 1600 km is verified in dispersion managed quasi-linear systems by simulations.

Rayleigh scattering is one of the important factors affecting the performance of Raman fiber amplifiers (RFA). Effects of Rayleigh scattering on RFA, such as noise, crosstalk and power penalty, are investigated systematically. To reduce influence of Rayleigh scattering, optimum pump power, bidirectional pumping and isolators inserted are introduced, from which RFAs can be designed optimally.

In the case of no determination of Al composition on blocking layer, this paper has proved that there is an optimum Al composition so that carriers in undoped layer would recombine on the largest scale by analyzing their transportion in double heterojunction. The definition of optimum Al composition would have a guidance to device structure's design and MOCVD epitaxy.

The accuracy of optic current sensor with dual-layer circuit has been analyzed in this paper. The results indicate that the sensor head adopting small index of material and large incident angle will reduce requirement of machining accuracy. The influences of the manufacturing error of sensor heads with dual-layer circuit method and critical angle method have been compared as well, the manufacturing accuracy required by the former method is lower than that of the latter method.

The analysis of an optical system that is designed for obtaining the relative rotary movement azimuth information between the transmitter and the receiving settings is reported. By using the LiNbO3 crystal's linear electro-optic effect we have deduced the relationship between the intensity difference of the outgoing o ray and e ray and the relative rotary angles of the transmitter and the receiving settings. Some possible errors have also been analyzed.

To measure temperature field of power plant boilers with acoustic method, reconstruction algorithm with regularization method is presented in this paper and compares with the reconstruction algorithm of temperature field commonly used in the least square method. The main difference between this algorithm and the reconstruction algorithm used in the least square method is that this algorithm increases the reconstruction accuracy by applying a priori information of flame during the reconstruction of temperature field when there are few data. Computing simulation examines the effect of reconstruction of temperature field with different temperature distribution functions of this algorithm and the least square method, as a result, this algorithm is more accurate than the least square method. This algorithm can implement 2-D temperature field reconstruction in power plant boilers with the algorithm fast and accurately without measuring a lot of data.

The power efficiency of MOS charge pumping circuit is becoming one of the most important issues as the power supply decreasing continuously and the area of a chip. Owing to the threshold voltage losing of the transfer MOS, power-efficiency of traditional Dickson charge pumping is low. In this paper, a high-efficiency two-phase charge pumping circuit bases on the four-phase are invented, which solves the contradiction between the power-efficiency and the chip area consequently.

The article presents the simulated calculation for atmosphere backscatter signal detected by micro pulse lidar (MPL). The simulation results have been proved by the measurements with a real MPL. Effects of MPL system parameters, such as laser energy, number of laser pulses, filter bandwidth and field of view on signal-to-noise ratio for the signal of MPL have been discussed and analyzed.

Radiative transfer model in the atmosphere-ocean system is completed by connecting three-component model of ocean color with radiative transfer theory. The data simulations of the properties of information relating to ocean colour remote sensing such as water-leaving radiance are also made. The analysis results in this paper are quite reasonable and systematical.

In this paper an algorithm used to derive the aerosol optical thickness over land is developed. The algorithm is based on a Look-Up Table of the up surface reflectance computed from the 6S model and requires that some pixels in the image will correspond to the dense dark vegetation as the surface cover. The aerosol optical depth is computed by interpolation from the Look-Up Table automatically. The algorithm was applied to the middle area of Jiangxi. The average aerosol optical thickness derived from the imagery shows a good agreement with measurement from the observatory.

Ground-based measurements of the aerosol optical thickness at an island are taken from October 17, 2000 to November 2, 2000 to achieve information of ocean aerosol properties with a multibands sunphotometer. In this paper, the calibration of sun photometer, the calculation of atmospheric aerosol optical thickness and the Angstrom parameters a and β obtained from aerosol optical thickness are discussed. The results show that in Yellow Sea the atmospheric aerosol consists of nature aerosol and aerosol optical thickness is approximately 0.1 in the most cases. Generally, Angstrom parameter a is nearly 1.2 and β is nearly 0.05.