Quantum control theory is a new interdiscipline, which mainly studies the control of quantum state for systems in the microworld. This theory is obviously different from the classical control theory, and currently, the method through experiments is the most direct and effective method for research of quantum control. In this paper, the current research state of quantum control in experiment is systemically introduced, and the future of the research is also prospected.

n this paper, the equivalence of the angular-spectrum representation and the first Rayleigh-Sommerfeld diffraction formula is demonstrated simply by coordinate transformation and the approximate formulas-Fresnel-Kirchoff diffraction, Fresnel diffraction, Fraunhofer diffraction are derived directly from the angular-spectrum representation.

Using two steps excitation of the cesium 8D atomic level in a cesium-potassium vapor mixture, we observed the reverse heteronuclear energy-pooling collision Cs(8D)+K(4S) →Cs(5D)+K(4P) at thermal energy. A double-modulation technique has been used to select the fluorescence contributions at the K(4PJ) exit channels due only to the above reactions. The ground state potassium atom density was measured by the absorption of line from a K hollow-cathode lamp. The measured density and fluorescence intensities have been used to obtain reverse energy-pooling rate coefficients. The contribution to the rate coefficients from other processes is discussed.

The characteristic of a continuous-wave (CW) laser diode (LD) end-pumped Nd:YVO crstal electro-optic Q-swtiching with pulse repetition rate from 20 to 5000 Hz laser is presented in this paper. With 25 A (about 10 W) of the incident pump laser, 1 kHz of pulse repetition rates, Q-switching 1064 nm laser with average power of 160 mW, pulse width of 20 ns is obtained. The experimental results are analyzed and discussed.

The absorption spectra, luminescence spectra and fluorescence lifetime of Yb:YAG crystal grown by TGT were measured and the effect of annealing at oxidation and reduction atmosphere was studied. The absorption cross sections of main spectra 938 nm and 967 nm are 0.74×10-20cm2 and 0.36×10-20cm2. Yb2+ ions were not found in the Yb:YAG crystal by analysis of spectra. Different UV absorption spectra near the fringe of as-grown crystal were found.

This paper introduces a current-stabilized xenon-lamp simmer circuit. The circuit is very suitable to long pulse(ten to one hundred milliseconds) laser. We make a feedback to the PWM in order to stabilize the simmer current. The circuit is used to simmer different parameter xenon lamps.

In this paper the construction of low-qubit quantum full-summator by using Toffoli gate, CNOT gate, etc. is studied and it's transformation operation is analyzed. By comparison the rule about construction of multi-qubit quantum full-summator is obtained.

A fluorescence detection scheme is applied to find the zero point of the magnetic field in the experimental system. This method is useful in the experiment of cold atoms and atomic optics.

The squeezing properties in a new kind of nonlinear coherent states are discussed via the measured phase operators introduced by Barnett and Pegg. The conditions of squeezing are found and the relations between the squeezing and the coherent parameters are shown by numerical calculation.

An approach, which forces a unified chaotic system to the expected point by analytically designing the controller to collocate the Lyapunov exponents, has been proposed. Because Lyapunov exponents of the controlled system are prophetic, the convergence rate can be controlled by changing the Lyapunov exponents. Result shows that the convergence of a controlled unified system is independent of the parameter.

The quantum fluctuations of charges and currents of mesoscopic capacitance coupled circuit with mutual inductance are studied by using canonical transformation and unitary transformation. The results show that when the components of the circuit are given, especially when the value of L1 = L2 is very small, with the increasing of coupling extent, the quantum fluctuations of charges in one loop of circuit decrease obviously, while those charge of the other loop increase obviously.

Optical thin films of MgF2 were successfully fabricated by pulsed laser deposition technique. The morphology and optical properties were investigated. The transmittance was 60%-80% in the visible light range, and more than 90% in the infrared range. The XPS showed the atom ratio of F: Mg in the obtained film was 1.9-2.1, very close to the bulk material. The refractive index of MgF2 thin film was -1.39 resulted from K-K calculation, also close to the value of 1.38 of the bulk MgF2.

A new approach for design of thin film multi-layer coatings based on adaptive real-coded genetic algorithm is proposed. The adaptive real-coded genetic algorithm to design coating is compared with the other optical coating design methods and conventional genetic algorithm. The result shows this method can evolve the design of better performance under the same design requirements. Theoretical and practical examples have prove that the method is efficient and reliable.

The influence of perturbation on the propagation properties of optical Gaussian-shaped pulses is investigated in optical fibers by means of variational method, and the evolution equations for the parameters of the optical Gaussian-shaped pulse are derived.

In this paper, a method is introduced for Ho:YAG laser transmission in thin fiber. Effects and the best match method are studied about interface lens, facula, and divergent angle of Ho:YAG laser. The impact of heating of rod on system parameter is discussed, correction method has been proposed, and correction formula is inferred. The experimental rasults are in accordance with the theory.

The technique of optical fiber sensor has been of great interest, as it has various advantages. In this paper a novel optical fiber sensor has been developed based on Michelson interference principle. Furthermore we describe a non-contact method for precision measurement of the surface tension on fluids by this sensor. The experimental results are more precise than that of conventional method. The system is immune to environment perturbation, the configuration is simple and the resolution is high. The presented method overcomes the disadvantages of conventional method, improves measuring precision, and expands the range for application of optical fiber sensors.

The asymmetrical fused-taper coupler is studied theoretically with weakly guiding and weakly coupling approximation in this paper, the analysis reveals that this kind of couplers have wavelength-flattened characteristics, and the degree of asymmetry can affect the splitting ratio directly. A wavelength-flattened coupler with different splitting ratio can be obtained by controlling the diameter ratio of two coupled arms in the process of fabrication. With 50% splitting ratio, the theoretical results agree with the experimental data.

The information capacities of optical communication system with erbium-doped fiber amplifier (EDFA) are studied. Ignoring fiber nonlinearities and dispersion, the expression of system information capacities with EDFA is derived using information entropy theory. It is shown that EDFA introduces information loss, and 4-11 (bit/s/Hz) of information capacities is obtained.

In this paper, based on the structure characteristic of array waveguide grat-ing(AWG), and the approximately arithmetic Bloch function, the structure mode of a planar array of taped waveguides is made. The radiation characteristics and simulation of AWG are calculated, energy density and dispersion characteristics on a tapered planar AWG are discussed. Numerical results demonstrate that the most radiation power is in the Brillouin center zone Ω, the relation between transmission coefficient Tm and diffraction angle a is obtained, and the calculation is in agreement with the simulation result.

We investigate the oxidation behavior of Si1-xGex alloys (x=0.05, 0.15, and 0.25). The thickness of nanolayers and property of nanoparticles in oxide films after oxidation in O2 (dry) atmosphere at different temperature and for various lengths of time are measured with the high precision ellipsometer, the Rutherford backscattering spectrometry and high-resolution scanning transmission electron microscopy. It was found that rejection of Ge from oxide layer results in piling up Ge at the interface between the growing SiO2 and the remaining SiGe, which forms a nanometer Ge-rich layer. We find a nanometer cap layer over the oxide film after fast oxidation, in which there are many Ge nanoparticles. Some new peaks in PL spectra related to the nanolayer and various kinds of nanostructure are discovered. We provide a quantum confinement model to analyze the PL spectra and the mechanism of nanostructure of the oxide and Ge segregation.

The basic detection principle of the optical properties of aerosol by mobile lidar is given. The structure and parameter of AML-1 mobile lidar system are presented. And some typical results measured in Bejing and Hefei are analysed.

The problem about target discretion is very important in many applications. In this paper, detailed research about the effects under some typical atmospheric and ground conditions on the target-background contrast at 0.43-0.75 μm computed by the software package-MODTRAN has been carried out. And the results are provided as following description: the numerical values of contrast present subtle variety according to the seasons shift, and it is easier to identify targets in winter than in summer;both the numerical values and the distribution with wavelength of contrast present alternation according to the atmospheric models;similarly, the aerosol models affect both the numerical values and the distribution with wavelength of contrast.

Atmospheric aerosol number concentration, atmospheric visibility and particulate mass concentrations, such as PM10, PM2.5 and PM1.0, were detected by an optical particle counter (OPC), a visibility meter and ambient particulate monitors respectively at the same time in Beijing during the winter of 2001. According to the analysis of multivariate linear regression for particulate mass concentration and visibility with atmospheric aerosol concentration, the empiric formulas are given for calculating the visibility, PM10, PM2.5 and PM1.0 from atmospheric aerosol number distribution measured by an OPC.

In this paper, we calculate the extinction efficiency factor Qext of single spherical particle by using Mie scattering theory, and analyse its characteristics with the increasing of radius r. The relationship between extinction coefficient and laser wavelength is calculated for Junge model. For Deimendjian model the ratios table of 5 lidar wavelengths extinction coefficients is calculated, and the size distribution can be fit according to the table.