A discrete Cayley number neural network model is presented for the first time,whereby a neuron is a 256-state (±1±i±j±k±e±ie±je±ke). Signal-to-noisetheory is used to analyse the stability and the storage capacity. The storage capacity of theCayley model is the same as that of the Hopfield model. This 256-state neural networkcan be applied to recognize the 256-level color or 256-level grey patterns.

A technique of using optical wavefront-division multiplexer to realize highefficiency joint transform correlation is proposed in this paper. The input plane of thesystem is divided into many equal perts by computer, and in every part the reference andthe input images displayed side by side. An optical wavefront-division multiplexerused in this system makes the optical information read out from different ports to form apower spectral array at the focal plane of the first Fourier transform lens. As a result, enhanced optical correlation signal is obtained at the output plane. The proposed real-time high-efficiency joint transform correlator (JTC) can use the physical area of the liquid crystal light valves (LCLVs) as well as the readout lightmore efficiently. The principle of the system has been analyzed. The design of the optical wavefront-division multiplexer and the experimental results of the system are given.

A mathematic model, numerical simulation result of symbolic substitutionusing optical reflexive associative memory technology are presented in this paper. And amethod implemented symbolic substitution using optoelectronic hybrid system composed ofprogrammable liquid crystal television (LCTV) spatial light modulator is presented also.The symbolic substitution possesses excellent capability of making correction for error.

Using Ar+ 514 nm writing beams, we realized real-time and long-time imagestorage in MO-PVA and EO-PVA organic films for the first time. The images includedChinese character, English words and Pictures. It is estimated that the information cankeep for more than one year. The associative memory was achieved furthermore.

A new method is presented to acquire 3D profile of an object by measuring theobject twice. This technique can produce a correct unwrapping in the presence ofdiscontinuites in the process of Phase restoring. We introduce it into the measurement of a3D object shape and obtain satistactory experimental results.

Based on the polarization-optical interconnection unit, ready-assemble compactmorphological processor with high packaging density is developed. It is compact instructure,insensitive to encironmental disturbance and effective in performance.Experimental results are given.

We realized firstly the 633 urn erasable optical storage in two samples, MOPVA and EO-PVA, by using pre-excitation of a 514 urn Ar+ laser, and studied therelationship between pre-exciting beam and writing bans. The various experimentalphenomena were explained with the model of four-energy level and Biphoton resonance.

This paper describes a novel scanning tunnling microscope (STM) system usinga two-dimensional monolithic Paranel spring (MPS) and piczo-electric actuators (PZT)for precision two-dimensional positioning. This leads the interference between the x-axisdisplacement and the y-axis to be very small. The PZT used for controlling the z-axisdisplacement and the sample-to-tip distance is mounted on the monolithic parallel spring.Therefore, the mutual interference to z-axis displacements is negligible.

In this paper, the crystal spectrograph used to investigate long wavelength softX-ray spectroscopy of laser-produced plasmas was described. The laser plasmam soft X-ray spectra with wavelength up to 5.8 nm have been taken by using OHM crystal (2d=6.35 nm), combining with very thin carbon filter (310 nm in thickness) and soft X-raysensitive film (SIOFM-5FW). The measured spectral resolution of the spectrograph wasalso given.

A table sized Raman free electron laser (FEL) is proposed. The new FEL device is composed of a Marx generator, a pseudospark discharge and a small Periodwiggler. The outline dimension of the new FEL will be reduced to 1/4～1/5 of a traditional FEL.

A Nd:YAG laser was side pumped with laSer-diode-array of 45 W Q-cw(400 μs) output. This laser provides 3.5 mJ output at 1064 nm for free runing oscillation, and 0.85 mJ at 532 urn for Q-switched operation with pulse. width of 15 ns. Removing the Q-switch away, and shortening the cavity optical length to less than 5 cm, a single longitudinal mode of 532 nm laser was observed near threshold. Increasing the pumpPower somewhat, we have observed the antiphase laser output.

The lasing operation in Nd3+doped fluoride glass fiber has been obtained for the first time at 1.05 μm, The emission characteriatics of the laser with different outcoupling. are studied, and the aharge of laser emissions with variations in pump power is domostrated.

The photostimulated luminescence (PSL) of Eu2+:BaFxCl2-x (x=0.90,0.95, 1.00, 1.05, 1.10, 1.15) phosphors under UV-irradiation is reported. Throughchanging the stimulated mode and scan direction of the stimulating light, the measurementmethod of the density ratios and photostimulated cross-section of the two kinds of F colorcenters during the PSL of Eu2+:BaFxCl2-x phosphors are given. Utilizing this method, westudied further the dependence of the density ratios and phtotstimulated cross-section ratios of the two kinds of F color centers on the F/Cl ratios.

Single crystals of Cr3Sr3Ga2Ge4O14 garnets are grown by using the Czochralskimethod in Platimum-rhodium crucible. The polarised optical absorption spectra of Cr aremeasured. The schematic description on the absorped bands in visible and near-IRwavelensth is presented. We suggest that Cr enters the octahedral and tetrahedralpositions as Cr3+ and Cr4+ respectively. The near-IR absorption of Cr4+ will affect theluminescence of Cr3+.

Three kinds of defects are observed in Cr3+: LiCaAlF6 crystals, which areliquid inclusions, solid inclusions and homogeneous micro-crystullites. The relationbetween common defect morphologies and growth direction has been obtained. Finally,the formation mechanism and elimination of these defects are discussed.

The amplitude regions for the first, second and third order solitons innonlinearity-sauration optical fibers and soliton propagating properties are numericallyinvestigated in this peper. Unlike that of the Solitons of NLS equation, the amplituderegions for the first, second and third order solitons of the Kumar-NLS equation are 1.4≤N≤4.0, 4.0≤N≤7.0 aam 7.0≤N≤15.0, respectively. The interactionProperties of the first order Solitons are analysized and five aspects of these properties areunderstood.

Based on the well known optical them distribution in free space a generalizedstimulated Raman scattering (SRS) coupled wave equation is deduced and a simplemethod to calculate the temporal and spatial distribution of pump beam and Stokes beamin SRS is proposed in the paper. The results obtained by this method show that, for SRSStokes beam, not only the intensity is enhanced but also the pulse duration can becompressed. The principle and conditions being satisfied for beam clean-up are discussed. The merits of SRS in optical communications for compensating both the intensity loss and pulse expanding due to fiber dispersion are emphasized.

A direct electro-optic sampling system is set up. A gain-switched InGaAsPinjection laser is used as the source of sampling and a sampler utilizing the longitudinalelectro-optic effect in GaAs substrate of microstrip line was built. The impluse responseof a InGaAs/InP photo-detector of 0. 35 mV/Hz1/2 sensitivity and 9 ps time reolution aredemonstrated.

The design of a super-Gaussian serrated aperture (SGSA) is proposed in thispaper. The diffraction features are characterized for the special serrated aperture by usingnumerical compunction. Light born through the SGSA can be iran formed into almostideal super-Gaussian them after pessins the spatial filter.

In this paper, we report a quasi-velocity-matched electrooptic (EO) modulatorconstructed by periodic domain inversion technology and the newest experimental resultswith it for generation of ultra-wide optical sideband. The quasi-velocity-matchingbetween phase velocity of microwave and the group velocity of light, not dependins onthe modulation frequency, was etublished by using periodic domain inversion of an EOcrystal LiTaO3. Consequently, long effective interaction length was ontuined at 16.25 GHz to increase the modulation effeciency. As a result, we have obtained modulation index 57 rad and extended the sidebands as wide as 1.85 THz.

The conversion efficiency of X-ray-induced electrons for X-ray diodes (Alcathods) was discussed. Sesitivity of Al cathod was calibrated on the monoenergy subkeV X-ray source facility. The application of using X-ray diodes to measure sub-keV Xrop from laser-plasma interaction was introduced.

Lithium niobate single crystal fiber with parabolic refractive index profilecladding is achieved by using Mg-ion indiffusion process. Mg-ion concentration profilesof the magnesium diffused layer by theoretical simulation are close to the experimentalresults.

We discuss the steady-state and quantum noise behaviors of coherently or incoherently pumped conventional three-level lasers. It shows that the sub-poissonian statistics can be predicted in the regime where pumping rates can be comparable with the spontaneous rate of lower lasing level and lasing is not optimal. But only for coherently pumped case, lasing without inversion can occur and noise squeezing is increased because of quantum-interference effect.

The frequence up-conversion effect, the absorption spectra of Er:LiNbO3 crystal and the lifetime of the 4S state as well as its temperature dependence arereported for the first time in this paper. The up-conversion mechanism and the possibilityof laser action of the crystal are discussed.

A new method of automatitally reconstructing the 3-D surface of an objectfrom the deformed grating pettern is proposed. The method can automatically andaccurately obtain phase value at every pixel point without assigning fringe orders by usinga discrete cosine transform algorithm. It is flee from the errors caused by the higherharmonic components and the variation of light level. Theoretical analysis andexperimental verification are presented.

A new model of the injected current spreading in the active layer for LD arrayis presented in this paper. Regarding the electric field distribution in the lating region as asynthetical result of each unit, we also showed and explained the experimental result byusing Continuous Wave Electro-optic Probing (CWEOP) method to detect the electricfield distribution in the active layer of LD array.

The ablation rate and etch threshold of the C60 film are measured by using 308urn excimer laser.The effect of O2gas on the ablation characteristics are discussed.

The technology control, structure and properties of PECVD SiON films and thepotential applications of thih film waveguides in optical interconnections for VLSI arediscussed in this peper.