ZnO,as a novel material of Ⅱ-Ⅵ semiconductor,has excellent optical and electrical properties. ZnO-based thin films have considerable potential applications in many fields,such as UV light emitter,spin functional devices,gas sensors,transparent electronic and surface acoustic wave devices. Firstly,the relevant knowledge of ZnO and pulsed laser deposition is introduced,then recent advances on ZnO-based films,such as p-ZnO,p-n junction,Zn1-xMgxO thin film,Zn1-xCdxO thin films and magnetic ions doped ZnO thin films are illustrated with the emphasis

The recent development of lattice atom optics is introauced,including atomic optical lattices,atomic magnetic lattices and magneto-optical lattices,and some new results of atomic magnetic lattices and magneto-optical lattices,and some new results on the investigations of magnetic and magneto-optical lattices are reported. Afterwards,some recent progresses of dynamic process of cold atoms and Bose-Einstein-condensed atoms in optical lattices,and coherent propagation and control of quantum states are briefly reviewed. Finally,potential applications of atomic optical lattices,atomic magnetic lattices and magneto-optical lattices in the preparation of photonic crystals and so on are briefly introduced.

The high spectral resolution of hyper-spectral data provides the ability for diagnostic identification of various materials. The purpose of spectral feature extraction is to extract substantial information from the original data input and filter out redundant information,then classification and identification can be processed. The author introduced a method based on wavelet decomposition for spectral feature extraction. Appropriate wavelet is applied to the pre-analyzing signals and make it decomposed,then the high-frequency component contains much important feature information. We can detect every absorption strips and their left and right boundaries according to the original signal by finding the local modulus maxima of high-frequency weight. The method is terser and more effective than other traditional methods. It proved that wavelet analysis is a more perfect,method of spectral feature extraction.

As a kind of uninjurious examination instrument,CT has gained wide use in medical diagnosis. But it is mostly used in stationary organ because of it's reconstruction method,and for its' moving artifacts in image it is seldom used in moving organ. Intermediate function reconstruction algorithm which is based on Fourier space can be used to reconstruct ROI image,so using this algorithm can reduce data acquisition time. This characteristic can improve the quality of moving object scan and image reconstruction

Zero-power correctors are often used to balance the aberrations caused by other components. A two-sphere system with a two-lens zero-power corrector placed before the primary mirror is discussed. According to third-order aberration theory,the conditions of the absence of aberrations are analyzed,and the influences of different system parameters to the remaining high order aberrations of the system are investigated. The results show that the bigger the relative aperture of the primary mirror,the bigger the remaining high order aberrations;the structure of the corrector with positive lens in front of the negative one is better than otherwise;and a suitable single lens' power may make the system the lowest aberrations.

The maladjustment of unstable-stable hybrid resonator is studied theoretically.When the parametersoutput mirror of hybrid resonator areis changedadjusted,we calculate the loss of the lowest-order mode with Fox-Li method. The results show that the resonator is stable in stable direction,and unstable in unstable direction,especially when the output mirror is rotated or moved in unstable direction. The off-axis unstable resonator is more stable than the symmetrical unstable resonator. With the maladjustment characteristic of the hybrid resonator,we can improve the Q-switch scheme and we prove the application of AOM in positive unstable-stable hybrid resonator theoretically.

The properties of a diode-pumped Nd∶YVO4 continuous-wave laser operating at 1.34 μm with different resonator lengths were studied. The effects of thermal lens on the stability of cavity and the output characteristics were studied by calculating the laser mode size on the front surface of laser crystal. A simple planar-concave cavity was used. The maximum output power of 2.39 W was achieved at incident pump power of 7.56 W,with the maximum slope efficiency of 36.5% and optical conversion efficiency of 31.7%.

In order to develop a practical CuBr laser,the expressions of discharge circle parameter for CuBr laser are presented. Combined with the CuBr laser kinetic model,the plasma dynamic resistance characteristics in different circuit are studied. The plasma resistance of the simulations are found to be in agreement with the experimental data.

In a recent paper of Optics Letter(Fan Hongyi and Lu Hailiang,Optics Letters 28(2003)680)the complex fractional Fourier transform(CFFRT)is introduced,which is different from the usual two-dimensional real fractional Fourier transforms. In the present work we illuminate its definition from the point of view of rotation of the complex form of Wigner distributions as well as from the view of optical propagation mechanism in graded-index medium. The newly constructed quantum mechanical entangled state representations are used to link CFFRT to the Wigner distributions.

We consider a single-Cooper-pair box biased by a classical voltage and also irradiated by a single-mode quantized field. We investigate the dynamical behavior of the Pancharatnam phase and the geometric phase of the system,and find that the dynamic behavior of the Pancharatnam phase decreases with time,and the geometric phase increases with time. When the decreasing rate of Pancharatnam phase is large,the increasing rate of geometric phase is small,and vice versa.

We propose a scheme of probabilistic teleportation of an arbitrary three-particle entangled state via three pair nonmaximally entangled particles. Quantum teleportation can be successfully realized with a certain probability if the receiver adopts an appropriate unitary-reduction strategy. The probability of successful teleportation is determined by three smaller coefficients of the three entangled pairs. If the quantum channels are composed of three EPR states,complete teleportation can be realized by this method.

The atomic dipole squeezing is a very important phenomenon in the interaction between an atom and an optical field,but the atomic dipole squeezing of a three-level atom with an intensity-dependent coupling is seldom reported. By using a full quantum theory,We investigate the time-evolution properties of the atomic dipole squeezing of the degenerate quantum-beat three-level atom intensity-dependently interacting with a single-mode coherent field,and explore effects of splitting of the lower energy levels of the atom,the field intensity and the initial atomic coherence on the atomic dipole squeezing. Our results show that,when the two lower levels of the atom is degenerate,dipole squeezing parameters evolve periodically with time,and the splitting of the lower levels destroy this periodicity and reduce the amount of dipole squeezing. The relationship between the amount of dipole squeezing and the initial coherent field intensity is not monotonous. The initial atomic coherence has a great influence on the dipole squeezing.

Atomic dipole squeezing effects in the system of the two-mode entangled coherent states interacting with a V-type three-level atom in Kerr medium has been discussed. The results indicate that the atomic dipole squeezing effects depend on the degree of entanglement of the two-mode entangled coherent states,the coupling strength of the Kerr medium with the field,the detuning and the atomic initial state.

On the basis of the charge discreteness,the inductance-coupling mesoscopic circuit is quantized,the quantum loop equations in coupling form are given,and the energy spectrum is computed in charge representation. The results show that,taking account of the charge discreteness,it will make the quantum loop equations complicated,and the energy spectrum of the circuit is not only related with the circuit parameters,but depended on the quantization character of the charge and the undetermined phases.

Bilinear systems,matrix systems and right-invariant systems are distinguished first.Then controllability theorems of such three different systems are summarized,the key points focus on the necessary and sufficient controllability conditions for right-invariant systems,and the relation with bilinear systems. Controllability theorems of these three different systems are especially emphasized by using Lie groups and Lie algebra. Different controllability theorems of quantum systems using similar method are analyzed in detail. Corresponding relations of controllability between quantum systems with bilinear systems are pointed out by means of comparison,and each type of controllability applied to different situations are also given.Relationships among different notions of controllability of quantum systems are established.

The diffusion equation in multiple-scattering media with photon density wave is a hotspot in the field of biomedical photonics. Considered the cubic boundary conditions,a second-order analytical solution of diffusion equation of photon density wave is presented. The relationship between the absorption coefficient and the flux is derived,for the flux can be easily obtained in practical experiments. Using this relationship and the optical properties of typical forearm tissue,the second-order simulation results are given. Compared with the results of first-order solution,second-order one is more accurate and the precision is greatly improved. This method proposed is applicable in the biomedical imaging of multiple-scattering media,and has many advantages in the imaging quality and spatial resolution.

We report the investigation on the oxidation behavior of Si1－xGex alloys(x=0.05,0.15,and 0.25). In the PL spectra of germanium quantum dots formed by the oxidation of Si1－xGex substrate,it is clear that there are several peaks at 724 nm,769 nm,810 nm and 861 nm wavelength along the emission band,which are correlated the quantum confinement effect with 3.98 nm,4.17 nm,4.35 nm and 4.62 nm diameter of the germanium clusters,respectively. The simulation result with MC method demonstrates that the germanium clusters in above diameters are more stable under above conditions. A quantum confinement model has been set,and some calculations with the UHFR method and the quantum confinement analysis have been proposed to explain the PL spectra.

The influence of the fiber loss on adiabatic compression of fundamental solitons in dispersion decreasing fiber(DDF)is investigated,and the method used to improve the adiabatic compression effect in DDF based on distributed Raman amplifiers(DRAs)has been simulated numerically. The results show that the fiber loss destroys the adiabatic compression effects in DDF;adopting the DRAs can improve the compression effects in DDF and get a higher compression factor and pulse energy;by selecting the appropriate gain parameter of 0.27/LD,a fundamental soliton with l0ps width can be compressed into a 417 fs with 5.9 times initial pulse energy,136.3 times initial peak intensity and only 2.8% pedestal energy ratio.

Based on the rate equations and light propagation equations of four energy level system,the performances of gain and noise figure of broadband erbium-doped tellurite fiber amplifier(EDTFA)with an isolator in the midway are researched. The results show that the signal gain and noise figure are obviously improved due to the effective suppression of backward propagating amplified spontaneous emission(ASE)noise and the resulting consumption reduction of reversed particles by the isolator. Meanwhile the analyzing of gain and NF regard to different fiber length and different isolator position shows that the gain improvement of about 10 dB and NF reduction of 1 dB are expected at the short wavelength when the isolator lies at the optimum position. Amplified bandwidth and PCE of EDTFA also be improved with a midway isolator.

Lidar ratio of cirrus cloud has been attracted much attention as it is one of the most important parameters to study the optical properties of cirrus cloud. A new method has been introduced to deriving the lidar ratio of discontinuous high-altitude thin cirrus cloud by using the data from Mie scattering lidar measurements. The lidar ratio of discontinuous thin cirrus has been obtained after comparing the backscatter signal of the atmosphere observed in the condition of with and without cirrus in the usual days. The reliability and the disadvantage are also discussed by comparing with other methods.