Phosphors SrAl2O4 doped by Eu2+ and Dy3+ ions were synthesized by a solid-state reaction at 1300 ℃ under mild reducing atmosphere of N2 -H2 . The properties of afterglow and thermoluminescence spectra of SrAl2O4:Eu2+and SrAl2O4:Eu2+, Dy3+ were compared and the influence on trap levels of SrAl2O4:Eu2+by codoping Dy3+ was also studied. From the XRD and photoluminescence results, the crystal phase and luminescence band are not changed by codoping Dy3+. The thermoluminescence spectra show that the dopant of Eu2+ions could lead into two trap levels with different depth in SrAl2O4. The result of comparison of thermoluminescence properties of SrAl2O4:Eu2+and SrAl2O4:Eu2+, Dy3+ after different delay time indicates that the density of the original shallow traps is increased by the codopant of Dy3+, and the luminescence performance is improved. The thermoluminescence with different delay time indicates that the luminescence decay difference and electron transfer between trap levels in SrAl2O4:Eu2+, Dy3+ may result in the complicated decay phenomena of the afterglow.

According to Fresnel-Kirchhoff diffraction formula, the light intensity expression about diffraction at rectangular apertures was obtained and numerical calculation was carried out, influence of the size of aperture on light intensity of rectangular diffraction was analyzed. The light intensity distribution was characterized by Fraunhofer diffraction when the projection of light source is located in the symmetry center of rectangular aperture and the size of aperture is small enough. With increasing of the size of aperture, the ratio of adjacent peak and valley value of light intensity decreases in the same region of geometric shadow, and more light intensity peaks appear in the geometric illuminated district. The symmetry no longer exists when the projection of light source is not located in the symmetry center of rectangular aperture. At last the light intensity distribution of Fresnel diffraction at several rectangular apertures is calculated and analyzed.

Cracking in Nd: YAG laser crystals grown along by Czochralski method is often observed. The growth defects in the cracked Nd:YAG crystal were investigated with optical microscopy, scanning electron microscope(SEM), X-ray diffractometry and optical absorption method. There are a lot of inclusions in cracked crystal, whose composition deviates from the normal composition of crystal. The dislocation density is so high that the phenomenon of pile-up occurs. Some micro-cracks was observed in dislocations etch pit. Cracking results from stress concentration caused by inclusions, which is caused by components overcooling, fluctuating of growth rate and asymmetry of temperature gradient in later period of crystal growth.

In high power laser system, small-scale phase distorted wavefront measurement is necessary to compensate and control the wavefront of laser beam with intermediate frequency. As wavefront sensor, array Fresnel zone plates split wavefront, and its focus characteristics were investigated. Also, influence of the structure of array Fresnel zone plates on wavefront reconstruction was discussed. Simulation results show that the error of wavefront reconstruction is less than one-tenth of wavelength with suitable optical parameters. The optical system for the measurement of distorted wavefront was built to investigate the sensing characteristics of array Fresnel zone plates. Experimental results prove the feasibility and effectiveness of the wavefront measurement.

An excimer laser pulse energy detection system was introduced, which is able to pick out either a single pulse energy or the individual energy of a desired series of pulses during the laser runs in a pulse repetition mode up to 200 Hz. By use of a pyroelectric detector as energy sensor the system consists of amplifiers, peak-holding circuits, MCU, display and communication interface. Owing to an excellent interference suppressor circuit design the system runs well even if the thyratron discharging EMI is very strong. Testing on the 193 nm ArF and 248 nm KrF excimer laser, response time of 4 ms, power resolution of 10 μJ, sensitivity of 0.5 V/mJ and power accuracy of ±3% are achieved. This system can be used as an energy-meter alone or as a real time detector in a closed feedback loop for laser pulse energy stabilization. After substituting the pyroelectric detector with a photomultiplier tube, it is expected that the system can be suitable for repetition rate higher than 1 kHz.

The formula of temporal coherence of dynamic subjective speckle was deduced, by which the influence of optical parameters from the imaging system on temporal coherence of speckle was analyzed. It is concluded that the influence of the parameters of screen on speckle temporal coherence can be neglected and the speckle temporal coherence is mainly affected by the diameter of the lens or the size of laser spot on screen. If the size of laser spot is lager than that of resolution spot on object plane, the diameter of lens gives the mainly affection, while on the other side the size of laser spot gives the dominating affection and the temporal coherence can be reduced by reducing the size of laser spot on screen. The result was confirmed by simulation and experiment, and it can give an instruction to speckle reduction in laser display.

The entanglement dependence of Berry’s geometric phase is studied in the case of two spin-1/2 particles with a spin-spin interaction. Berry’s phases for two spin-1/2 entanglement particles in the presence of spin-spin interaction and noninteraction are calculated, respectively. The expression of calculating geometric phase, when entanglement vanishes, is obtained. Moreover, the geometric phase is discussed when only one of the two particles is affected by the external magnetic field. It is shown that its geometric phase is not equal to that of single particle which is acted by the external magnetic field, and the result is related to α that affect the strength of entanglement. A general entanglement-dependence geometric phase is formulated.

The exact solution of Schr?dinger equation for two spin-1/2 particles under the rotating magnetic field is obtained. It is proposed that pulse bandwidth is a crucial factor in population transfer. The figures of energy and population are analysed, and the results show that bandwidth of pulse decides if there is an exchange between states at the places of energy degeneracy. Comparing our result with Unanyan’s, it is found that whether the adiabatic condition is satisfied exactly or not is not important, and the adiabatic condition that they derived may not be a reliable criterion for preparing entangled states.

A scheme for teleportation of four-particle W state via two pairs of non-maximally two-particle entangled state is given. The sender only need to carry out one orthogonal complete measurement base, then the sender inform the measurement results to the receiver by classical channel, and the receiver introduce auxiliary particle F, and carry out a Von Neumann measurement after giving a proper unitary transformation. The receiver introduce another two auxiliary particle B3 B4 , and carry out the proper unitary transformation on his own particles. As a result, the teleportation of four particle entanglement can be realized with a certain probability. In this scheme, the sender only carry out one orthogonal complete measurement base, and if the quantum channel is in maximum entanglement, this scheme can realize complete transmission.

Because the property of a class of W state can be used as entanglement channel for realizing perfect teleportation and dense coding with the successful probability 100%, a simple scheme is presented for generating this W-class entangled state. It relies on the superconducting quantum interference devices (SQUIDs) simultaneously interacting with single-mode cavity field under resonant circumstances. The distinct feature lies in that the whole course of preparation only needs one step. The scheme can be implemented by the present cavity QED techniques.

For TE electromagnetic waves propagating at the interface of a conventional nonlinear material and a negative refraction material, the properties are investigated in detail. The results prove that there exist pass bands, which have the material-dependent properties. Base on the analysis, the interface supports both forward and backward TE surface waves which can change each other under certain conditions. The electric field amplitude in the two materials is also studied. It’s found that the two amplitudes can change from one material to the other with the difference of energy flux. Both of the two amplitudes are near the interface, one is almost at the interface.

A theoretical investigation with the symmetrical split-step Fourier method was presented on the nonlinear propagation and pulse compression of a femtosecond laser pulse at the anomalous region in a photonic crystal fiber. The effect of different pump wavelengths on nonlinear propagation and compression of ultra-short pulse was simulated and analyzed. It was concluded that in the case of the same initial peak power, the compression factor and peak power are the best, while the optimum fiber length is the shortest with the pump wavelength of 1000 nm among these pump wavelengths simulated. It was also found that the compression factor and peak power increase with initial peak power, while the optimum fiber length decrease. By using proper pump wavelengths and initial peak power, efficient pulse compression can be attained in photonic crystal fibers.

The self-deflection characteristics of bright screening-photovoltaic spatial solitons (SPSS) in biased two-photon photovoltaic photorefractive media were studied numerically. The results show that two-photon bright SPSS possesses a self-deflection process in the direction opposite to the crystal’s c axis during propagation and the center of the bright solitary beam moves on a parabolic trajectory. The self-deflection distance of the bright soliton increases, reaches its maximum value at a certain external electric field, and then decreases as the external electric field increases. The relation of self-deflection distance of bright solitons and incidence light intensity is also nonlinear, which is similar to that of external electric field. Moreover, the self-deflection of two-photon and single-photon models is compared at certain parameters.

In order to restrict the instability of (2+1)-dimensional spatial optical soliton by the parameter control along the longitudinal axes, (2+1)-dimensional spatial optical soliton in parameter control was discussed by solving the (2+1)-dimensional nonlinear Schr?dinger equation with variable coefficients numerically. The results show that the parameter control, namely, the combined effects of periodically controlling both the diffraction parameter and self-focusing parameter along the longitudinal axes, can restrict the instability of (2+1)-dimensional spatial optical soliton to some extent. On the other hand, further simulation indicates that the propagation of (2+1)-dimensional spatial optical soliton in parameter control is less sensitive to both loss and finite perturbations, such as white noise. This reveals that (2+1)-dimensional spatial optical soliton in parameter control is stable.

To study the propagation properties of optical soliton in optical fiber, the third-order nonlinearity effect is regarded as the small disturbance. The attempted bright soliton-like solution is obtained from modified nonlinear Schr?dinger equation (MNLS). The Lagrangian density function expression is obtained by using calulus of variational method, from which the evolution equation for the parameter of the optical soliton-like pulse evolving on the propagation distance are derived. Then the direct and indirect effects of small disturbance via a,b,ω,ξ are analyzed and discussesd. The profiles of the evolution are made by the Matlab software, which show the relation of |b| with a,ξ with β and Z,ω with β and Z,a with b and Z.

Using the model of multi-photon nonlinear Compton scattering, influences of the third-order dispersion under Compton scattering on the extra-short optical soliton self-frequency shifting were studied. The results show that the third-order dispersion under Compton scattering has the strong repressive effect on the extra-short optical soliton self-frequency shifting. There is a clearer modulation oscillating system of the soliton pulse in the time domain. The frequency spectrum is divided into two clearer and higher spectrum crests in the frequency domain. Self-frequency shifting ΔδT∝T－70Z5/2β4/53, but the coupling slope αT and slope α before the scattering are not the same.

Sr2 FeMoO6 film was grown on vicinal-cut SrTiO3 (100) substrate by pulsed laser deposition method. The laser-induced thermoelectric voltage (LITV) was observed when the film was irradiated by visible and infrared pulsed laser. It was found that the maximal peak voltages were 0.9 V and 0.8 V when the film was irradiated by the laser of 1064 nm and 532 nm wavelength, respectively. The intensity of the LITV signals changed linearly with the pulse energy, which can be used as laser power/energy meters with high sensitivity. It was also found the signal polarity was reversed when the sample was irradiated through the substrate rather than at the air/film interface. Anisotropy Seebeck effect is proposed to cause the lateral voltages.

Based on one-dimensional quantum waveguide theory for mesoscopic structures, the electron transport properties in T-shape structure with Aharonov-Bohm rings are investigated. In the case of ensuring continuity of wavefunction and closing of the current at an intersection, the analytic expression of transmission coefficient are derived and transmission properties are analysed. It is found that the transmission coefficient of both sides shows typical AB oscillations with the change of magnetic flux. Altering the incident point of electron, the value of left transmission coefficient also changes, the right transmission coefficient appears total reflection phenomenon which has nothing to do with magnetic flux, but for in the vicinity of values φ/φ0=±n(n=0,1,2,…). The location of the incident point cause periodic modulation of the transmission coefficient. Minor deviation from the structure of the system has little effect on transport properties.

Based on a coordinate transformation, the boundary potential of a quantum rods is changed from the ellipsoidal form into a spherical one. The properties of strong-coupling magnetopolaron in a quantum rods in a three-dimensional anisotropic harmonic potential are studied using the linear combination operator and the unitary transformation methods. The relations of the vibrational frequency and mean number of phonons of strong-coupling magnetopolaron in a quantum rods with the cyclotron frequency of a magnetic field, electron-phonon coupling strength, aspect ratio of the ellipsoid and transverse and longitudinal effective confinement length are derived. Numerical calculation results show that the vibrational frequency and mean number of phonons increase with increasing of electron-phonon coupling strength and cyclotron frequency of a magnetic field and increase rapidly with decreasing transverse and the longitudinal effective confinement length. The vibrational frequency and mean number of phonons are increasing functions of the aspect ratio of the ellipsoid when e′>1, whereas they are decreasing functions of one when e′<1. When e′=1, the vibrational frequency and mean number of phonons are the minimum values.

A low frequency vibration-isolating system was designed in order to meet the special requirement of vibration isolation of Raman laser reflector in atom interferometers. The system uses both two-step passive and one-step active isolations. Analysis of the mechanical structure and the feedback loop was carried out in detail. The performance of the system using Matlab Simulink software was assessed, and the result shows that it has an isolation ratio up to more than 99% for 0.1～10 Hz frequency range.

The security of wireless video surveillance system (WVSS) can not be ensured only from encryption. WVSS is analyzed in the viewpoint of the whole system of information security. The mechanism of authentication, key management, air interface encryption, end-to-end encryption applied mainly in WVSS is analyzed and investigated emphatically.

The modified nonlinear Schr?dinger equation and variational method are used to derive the evolution equations for the parameters of super-Gaussian pulse and their analytic solutions. The influence of the third-order dispersion on the propagation properties in different sharpness super-Gaussian pulses in optical fibers is discussed. Three restraint relations between amplitude and pulse width, pulse width and chirp, chirp and frequency and the center are derived. Analytical solution about the evolution of pulse-width versus propagation distance is obtained. By using Runge-Kutta algorithm, influence of the third-order dispersion and the degree of the pulse’s edge sharpness on the pulse-width is described. The results indicate that the amplitude and pulse width satisfy the adiabatic relation, when the dispersion coefficient increases to around 0.3 or the pulse sharpness coefficient m≥3, the pulse signal will obviously be stretched, its cycle will significantly be larger.