Greater than two orders of magnitude improvements in the absolute frequency and isotope shift measurements of the In+ 5S2 1S0(F=9/2)－5s5p 3p1(F=11/2)transition near 230.6 nn are reperted. The fourth-harmonic of a semiconductor laser is used as the light source. The absolute frequency is measured with the help of a frequency comb referenced to a Cs atomic clock. The resulting transition frequencies for isotopes 115In+ and 113In+ are measured to be 1299648954.54(10)MHz and 1 299 649 585.36(16)MHz,respectively. The deduced cooling transition frequency difference is 630.82(19)MHz. The isotope shift is calculated to be 695.76(1.68)MHz.

A new method of measuring molecular line parameters based on the transmitted fringes of the F-P cavity was reported. A transmitted function of F-P cavity filled absorbent gas was derived from multi-beam interference theory. The transmission of the F-P cavity is the function of molecule absorption profile. With the increase of molecule absorption intensity,the width of the transmitted fringes increases. The measured line intensity and line width are consistent with HITRAN2004 database and theoretical calculation respectively.

A new design approach to function parameters of pupil filter based on optimization algorithm is proposed. Out of regard for practical request for optical energy and sidelobe intensity and superresolution,the appropriate parameters are selected to achieve the best three-dimensional superresolution by means of the computer simulation. Some superresolution optimization design models and examples are presented with figures testification. To suppress the sidelobe intensity which is concomitant with the increase of the resolutions,these filters are used in confocal scanning microscopic system,and as a result,higher signal-tonoise and good image contrasts are obtained. With applying optimization algorithms,the design of pupil filters becomes simpler,and possesses better comprehensive effects. The pupil filters,which are designed with the aid of optimization algorithm,possess larger GA,GT,S. Theoretical and practical examples prove the method is efficient and adaptable.

Owing to its high time bandwidth product and low probability of intercept,linear frequency modulated signal is widely used in modern radar. Based on wavelet ridge extracting of linear frequency modulated(LFM)signal,a new method used to detect and estimate the LFM signal is presented. It computes the wavelet transform of the signal firstly to obtain the 2D time-scale image,and then extracts the wavelet ridge of the signal with ridge extracting algorithm,finally performs the Hough transform in the time-frequency plane. The detection of lines in the time-frequency plane then reduces to a 2D searching for the peaks in the Hough transform parameter domain. Computer simulation results indicate that the method can detect the LFM waveforms in presence of strong noise effectively.

Hyperbolic tangent method is an important tool in the field of nonlinear differential equation. By using hyperbolic tangent method,the complex traveling wave solutions to the nonlinear Gross-Pitaevskii equation are obtained.

Based on Lie group theory and using the direct symmetry method,(3+1)dimensional Jimbo-Miwa equation symmetry is obtained. And by the optimization of corresponding Lie algebra theory,seven kinds of approximate reduction of the equation can be obtained. Through the variable separation as well as with the aid of the auxiliary function method,some new invariable solutions of reduced equations are presented.

A diode-pumped tunable Yb∶YAG thin disk laser was studied. Tuning wavelength range from 1020.5 nm to 1034.7 nn was obtained by using a quartz-birefringent filter set in the laser cavity. And the generation of 515 nm green laser was demonstrated by intracavity frequency doubling of type-I phasematched LBO in a fold cavity. A CW output power of 2.5 W at 515 nm was achieved. The fluctuation of green laser was less than 1% at the maximum output power in 1 hour.

The vacuum and oxygenous annealing effects on transmissivity,excitation,emission spectra and luminescence decay life time of the single crystal cadmium tungstate grown by Czochralski method are studied respectively,which indicate that oxygenous annealing is advantageous for increasing transmissivity,light yield,blue light emission proportion to a certain extent,and energy resolution of cadmium tungstate crystal. This may be caused by the oxygen vacuum reduced by oxygenous annealing and their absorption decrease in the range of 340～440 nm. Meanwhile,oxygenous annealing is advantageous for shortening luminescence decay life time and improving time resolution of cadmium tungstate.

The excited circular states are introduced by repeated application of photon creation operator on the circular states. The sub-Poissonian distribution and squeezing effect are discussed. The results indicate that photon creation operator can enhance sub-Poissonian distribution but supress squeezing effects. The Wigner function is studied,which obviously displays its nonclassical feature. The results obtained using the numerical method indicate that the interference effects change alterantly when the exited number m takes odd and even number respectively.

The analytical express of thermal concurrence is obtained by studying one dimension two-qubit XXZ model with magnetic field. It shows that concurrence has different behaviors as anisotropy parameters vary at certain temperature,and entanglement of the system is sensitive to the variety of anisotropy parameter of external magnetic field. When anisotropy parameter(Δ)is fixed,the concurrence is symmetrically distributed in the magnetic field. When the anisotropy parameter(Δ)is increasing,the concurrence tends to zero quickly. Meanwhile the variety of temperature has some effects on entanglement. As the temperature increases,the peak value of system entanglement reduces unceasingly,and the entanglement will completely vanish.

A quantum key distribution scheme based on single-photon polarization encoding was presented. In the protocol,Alice first sends string photons to Bob at random states of four single-photon states. Bob then does a unitary operation on it,sends it back to Alice and then a single photon is measured by Alice at last. The quantum key distribution is accomplished. The protocol needs a noiseless subspaces or subsystems. And the advantage is that it only needs single-photon states,local operations and polarization measurement. The security is garanteed theoretically.

Four partially entangled two-particle states are used as the quantum channel. Two schemes for probabilistic teleportation of an arbitrary four-particle entangled state are presented. The entangled state can be perfectly teleported probabilistically from the sender to the receiver if the sender performs four Bell-state measurements while the receiver introduces auxiliary particles and performing appropriate unitary transformations. Based on transformation operator,the theoretical explanation of two schemes is given by utilizing the relation of the transformation operators.

The fidelity of quantum states in the driving Tavis-Cummings model where the atomic initial state is any pure state is studied by means of quantum theory. Effect of the entanglement of the atomic initial state on the fidelity is investigated by numerical calculation. The results show that the fidelity is clearly affected by the degree of entanglement and the relative phase of the atomic initial state.

By the characteristic matrix methods,the rule about reflectivity changing with the incident angle of the TE wave and the TE wave in the photonic crystal whose refractive index is discontinuous to change with the sinusoidal function is studied. The main forbidden bands of the TE wave and the TM wave contain same characteristics,the scope of the incident angle of the main forbidden band is all small,in 0～0.11 rad. The bigger the amplitude of refractive index and the period number are,the better the quality of the main forbidden band is. There is no “general Brewster's angle”phenomenon in the reflected wave.

The phenomenon of spectral splitting in multiple quantum well(MQW)structures composed of one-dimensional photonic crystals is investigated by finite-difference time-domain method. The regularity of splitting is analyzed. It is found that the spectral splitting is induced by the coupling effect of the wells,whose features are determined not only by the well numbers but also by the parameters of barriers and wells. The results indicate that,in the symmetrical photonic MQW structures,each transmission spectrum will split into p different frequencies,where p is the number of the wells in MQW structures. These split spectra are un-folded mutually. In this way,photon confined states can be increased multiplicatively within forbidden band gap region with the maximization of channel density and optimization of effective bandwidth. It may be applied widely in the fields of super dense wavelength division multiplexing for optical communication and the precise optical measurement.

The exact solution of time evolution operator was obtained by applying the gauge transform of algebra dynamics. Such an operator describes the quantum state of time dependence of mesoscopic RLC circuit containing voltage source. The charge and current zero-state response of the import voltage signal in mesoscopic RLC circuit were acquired. The result shows that the system of mesoscopic RLC circuit has linear time invariant feature,and the response in mesoscopic RLC circuit is the same as that in the macroscopic RLC circuit.

Chaotic dynamics is sensitively dependent on the parameters,which is used for parameters identification and chaos synchronization. The drive response structure is employed,and the parameters of response system are adaptively adjusted to minimize synchronization error according to the predefined quadric index function and the corresponding optimizing methods. The unknown parameters of the drive system are identified and chaos synchronization between drive system and response system is achieved by the proposed method. The control experiments with quasi Gauss-Newton method,Hook-Jeeves method and conjugate gradient method are carried out. Discrete Hénon system and continuous Lorenz system with two unknown parameters are used as simulation examples,and the simulation results show that the conjugate gradient method possesses better performance,which can be further used to decode chaotic shift key secure communication.

Since most media of stimulated Brillouin scattering(SBS)are gases or liquids,the thermal collection or release within them will influence badly and destroy ulteriorly generation of SBS and its conjugation quality when the repetition rate was augmented or the duration of pumping pulse was prolonged adequately. It was experimentally investigated that effect of divergence of pumping beam on repetition operation characteristic of Brillouin cell in MOPA(Master-oscillator-power-amplifier)system with phase-conjugation mirror for improving the performance of SBS with high repetition frequency. The results show that repetition operation rate of Brillouin cell can be increased and the temporal and spatial characteristics of SBS can be improved,but the SBS threshold was increased and the pumped energy range of Brillouin cell was decreased with the divergence of pumping beam was decreased. Meanwhile,the fidelity decrease somewhat.

The 2.6～2.8 μm tunable laser setup based on single-resonant optical parametric oscillator(SRO)is designed and operated in order to get 2.7 μm tunable laser. The angle tuning curve and the effective nonlinear coefficient of Ⅱ(B)KTP optical parametric oscillator(OPO)are given. The cut angles of the crystal θ and φ are 62°and 0°respectively and the effective nonlinear coefficient is－2.97 pm/V. The 578 μJ output energy is obtained with the KTP SRO pumped at 1.064 μm TEM00 mode laser,and the energy conversion efficiency is 1.7%. The output wavelength can be tuned from 2.6 to 2.8 μm.

Detection of the concentration of CO2 is much significant to research on climate and environment. Coherent detection has the advantage of bigger SNR(signal-to-noise ratio)than incoherent detection. Now 1.5 μm laser has better performance in eye safety and low cost system design etc.,so 1.5 μm is the popular wavelength for the future molecule and aerosol lidar. The principle of detecting CO2 with coherent lidar is described and the coherent lidar system with 1.5 μm is designed,whose SNR is also estimated. Some conclusions can be drawn that coherent detection of concentration of CO2 with 1.5 μm is feasible and the SNR at 6 km distance is bigger than 10 after 3 minutes pulse accumulation. This coherent lidar system can also be applied to measure wind fields of atmosphere.

The self-mixing laser Doppler velocitimeter(LDV)system using single mode vertical cavity emitting laser(VCSEL)has better temperature characteristics and wider external cavity length(the optical path length from the laser front mirror to target plate)range compared with the system using multi-mode laser diode. Difference frequency analog phase locked loop(PLL)for small signal processing was used and it obviously improved the velocity measurement accuracy. Triangular wave modulation according to which frequency is divided by the Doppler frequency fd for direction discrimination was used and it improved its accuracy and dynamic range. The experimental results are as follows: when external length is 30±13 mm,temperature range is 0℃～55℃(no temperature controller for VCSEL),sampling time is 0.1 s,the velocity measurement resolution is better than 0.2% and when velocity measurement range is 30～480 mm/s,the accuracy is better than 0.1% and when the measurement range is 5～480 mm/s,the accuracy is better than 2%. When the supply voltage is 5 V,the forward direction indicating level is higher than 4.9 V and the backward level is lower than 0.1 V.

ZnO films were successfully deposited on the(110),(100)-textured diamond films by pulsed laser deposition(PLD)method. Annealing treatments for as-deposited samples were also performed in nitrogen ambient. The effect of different substrates and annealing atmosphere on the structural and optical properties of the deposited films was investigated by means of X-ray diffraction(XRD)and photoluminescence(PL)measurements. The best crystal quality of ZnO film was obtained on the(100)orientation diamond film. After annealing in nitrogen ambient,the intensity of ultraviolet(UV)emission decreases greatly and the deep-level emission is enhanced. It is contributed to the introduction of a great deal of oxygen vacancies into ZnO films during the annealing process,which can be further confirmed by X-ray photoelectronic spectroscopy(XPS).

Pump-signal four wave mixing(FWM)in co-pumped distributed Raman amplifier(DRA)is studied. Also,the calculation formula for the FWM power in DRA with nonuniform zero dispersion wavelengths is derived based on the method of sum of subsections. FWM induced channel crosstalk distribution along the transmission fiber and the interrelationship between FWM and the location of the fiber zero dispersion wavelength are simulated numerically. The suppression effect on FWM by introducing proper dispersion compensation fiber(DCF)is analyzed theoretically. Computational results show that,strong pump-signal FWM effect occurs in DRA with nonzero dispersion shifted fiber(NZDSF)as gain medium,which seriously degrades transmission performance of the dense wavelength division multiplexing(DWDM)system. Introductionm of appropriate DCF can not only reduce FWM channel crosstalk but also eliminate the waveform distortion induced by dispersion effectively.

A side-chain liquid crystalline polymer,poly{n-[(4'-hexylcarbonyl-biphenyl-4-oxy)]-1-propyne},is synthesized. It is a member of mono-substituted polyacetylenes. Its room temperature photoluminescence is investigated. At room temperature,its solution gives off intense deep-blue photoluminescence with its dominant emission band located at 380 nm. The 380 nm emission bands can be assigned to the emission from the isolated chain of the polymer. In order to confirm the origin of its photoluminescence,the electronic structures of the liquid crystalline polymer are calculated,and the absorption and photoluminescence are recorded from a small molecular liquid crystal that bears a biphenyl core.