The paper depicts the twenty years' development of the theory on quantum system control from being proposed to present. The research progress on the controllability of the quantum system is introduced in detail at first, then the studies about the quantum open-loop control methods that are often used for controlling the simple quantum system are analyzed briefly. The learning control method and feedback control method are discussed since they are two important methods in quantum system control and the advantages and disadvantages of those two close-loop control methods are pointed out. According to the trends of quantum system control development the paper predicts the future trends of its development and application. A set of process that is necessary for a whole system of quantum control is built. Based on the above contents, several core problems that baffle the advance of quantum control are pointed out finally.

With further development of the high brightness blue GaN-based LEDs, it would bring about a revolution in the illumination field. GaN-based materials are the focus in the semiconductor research and investment at present. In this paper. An overview of the basic properties of the nitrides, material film growth and some key techniques, such as ohmic contact, etching of GaN-based LED epilayer recent progress and the future prospect of GaN-based blue HB-LED devices is also presented.

Double wave description of the motion of a charged harmonic oscillator in an external time-dependent electric field is discussed. The time evolution equations of related physical quantities are derived. It is showed that the classical limit of the double wave description could have the same results as those of pure classical mechanics.

Present a new algorithm for the reconstruction from fewer views by a maximum entropy approach based on the Hopfield neural network. The numerical simulation is used to study the effect of reconstruction and the stability against noise. The results show that this algorithm has fairly high accuracy and good stability against noise.

We grew Cr4+:YAG crystal with high optical quality by Czochralski method using divalent Ca ions as charge compensation ions. Furthermore, we also annealed the as-grown crystal in air at 1450℃ for 50 hours. Absorption spectra show that the content of Cr4+ ions and absorption coefficient at 1.06μm in Cr4+:YAG crystal annealed increase remarkably. In addition, we also researched Q-switching experiments of lamp pump Nd:YAG laser using Cr4+:YAG crystal with different thickness as absorbers. The results indicate that grown Cr4+:YAG crystal can Q-switch effectively Nd:YAG laser.

According to the semiconductor laser diode performance characteristic, a kind of high-power diode laser driver was contrived. The output voltage is from 12 to 50 V and the duty ratio is 3 per cent when the maximum output current is 150 A . In the scheme design we used VIGOR device as power module and IGBT as high power change device. The driver circuit is very simple, however, it could restrain current surge efficiently. This ensures that the laser diode doesn't be disturbed. The online protection mechanism could monitor the semiconductor laser in real time. The slowly startup circuit and thermo-control circuit ensure that the semiconductor laser could work safely. Now the driver has been applied in the airborne lidar sample system for over one year. It performs normally and reliably.

The basis of two algorithms-transfer matrix method and block-iterative frequency-domain method are introduced to calculate two-dimensional (2D) photonic crystal. The computational domain is a 2D structure of square lattice that contains 5×5 dielectric rods in air. By changing the size of the radius of the central rod, we get their transmission and dispersion relationship. To the point-defect 2D photonic crystals, the two kinds of curves consist of the same photonic band gaps and defect states and embody the characteristics of photonic crystal from different aspects. Because of the difference of the central rod radius, different band gap range and different defect state frequencies are acquired. In our article, according to the transmission and dispersion curves of the different parameters, we analyze the practicability of using point-defect photonic crystal as laser resonant cavity. It is found the defect structure has the function of canceling the lowest-order mode by changing central dielectric rod size and dielectric constant,independent of the other modes .A mode fraction of radiated power is concentrated in the lowest-order mode ,canceling the lowest-order mode can reduce energy radiation and lead to improve quality factor.

Quantum computation is well known for its particular computational performance. In this paper, we try to combine quantum computation with classical neural computation, through designing several quantum operators we construct the quantum counterpart of Hamming neural network, and put forward a quantum competitive learning algorithm to realize functions of pattern classification and associative memory.

In this paper the controlled quantum counter is constructed. The output bits would remain unchanged as the control bit is in "0", and carry one as the control bit is in "1". This model may offer a useful and extended unit for counting and storage to quantum computer.

Based on the former research, the equation of a trapped ion considering double frequency of trap field in Paul trap can be solved exactly by using a function series expansion when the trapping potential is not an ideal instance. With the variety of parameter of double frequency, the laws of the character frequency of z direction (secular motion frequency, micro-motion frequency) are shown.

We have effectively implemented the study of the tracking control of space-time action for the controlled chaotic system, which concerns the orderly change of dynamic feature, using the gradual change method of driving parameter. Numerical simulation results show that the evolutional alignment of the chaotic system relys on the harmonious of signal strength when change scope of the parameter is a large region. Some simulation results of space-time chaos have been obtained.

In this paper, the evolution of field entropy of the interaction between A-type three-level atom and single-mode coherent field in a Kerr medium is studied. The influences of the Kerr medium and of the initial mean photon number n (the initial field intensity) on the entropy is discussed. It has been shown that the periodicity of the evolution curves of the field-entropy is influenced by the initial mean photon number n. With the increase of the initial field intensity n, the mean values of the evolution curves of the field entropy increase constantly when the initial field intensity n is not big (about n 40), with the increase of the initial field intensity n, the related degree of the field-atom decreases constantly and disappears. The Kerr medium intensity parameter μ also has influences on the periodicity of the evolution curves of the field- entropy. With the increase of μ, the Rabi oscillation frequency of the evolution cruves of the field entropy becomes rapid obviously.But tis maximal value decreases constantly.This shows that the field entropy is susceptible to the non-linearity action of Kerr medium.And the non-linearity action of Kerr mediumcam weaken the interaction of the field-atom.

The properties of the atomic inversion and the atomic state evolution are investigated by using the distance between density operaters in the intensity dependent coupling Janyes-Cummings model with an additional Kerr medium. The effect of nonlinearity interaction of Kerr medium and the average photon number of initial coherent field on the quantum properties of the atom are discussed. The result shows: the period of the atomic inversionis decreasing with the increase of the Kerr effect When the initialcoherent field is not great (n=10), the periodicity of the atomic state evolution is destroyed by Kerr effect, otherwise, when the initial coherent field is great (n=50), the atomic state evolution has periodicity approximately, also, the period is the same as atomic inversion Whether the average photon number of the initial coherent field is greator small, the probability that the atom locates initial state is increasing with the increase ofthe Kerr effect, when x/g=5, the atom always locates initial excited state nearly.

The influences of detuning, Kerr medium and initial atomic coherence on the atomic population and Cauchy-Schwartz inequality in the system of SU(1,1) coherent states interacting non-resonantly with a A-type three-level atom with Kerr medium are investigated. The results show that the detuning lengthens the cycle of collapse-and-reclairn of the atomic Rabi oscillation and induces steady nonclassical correlation. Kerr effects make the nonclassical correlation properties steady and shorten the cycle of collapse-and-revival of the atomic Rabi oscillation. The initial atomic coherence affects obviously on the nonclassical coherence degree between the two mode cavities, while the influence on the atomic population is not evident.

Target discrimiantion in a turbid medium is a practicable research topic. In this paper, we describe a method for increasing target contrast within a turbid medium by means of the polarization state of the scattered light. We present results of studies of the polarimetric backscattered light variations at 632.8 nm with and without a well-characterized painted target in a well characterized turbid medium consisting of 0.1μm monodispersed polystyrene spherical latex scatterers. The measured Miiller matrix, both with and without the target present, showed that only the major diagonal terms were significant and that they varied with particle concentration. We find that the diagonal terms of the Muller matrix measured with target and without target are different. In a turbid medium,we can determine whether the target is present or abscent from the difference. Simple discrimination based on detecting the major diagonal terms of Miiller matrix of backscattered light is shown to be more effective than the use of total intensity information.

A way of digital phase detector applied to the laser phase distance measurement system is introduced in this paper, which is based on DSPs and FFT algorithm.The theory and realization process are described in detail. The measurement result shows this method has high potential of application.

The spectrum function of an active fiber ring resonator was obtained through simple theoretical analysis, which clearly point out the frequency filtering characteristics of active fiber ring resonators. Based on this formula, the effects of the linewidth of input laser and the parameters of an active fiber ring resonator on the output linewidth were discussed. To confirm these theoretical results, some experiments were designed using different input laser and different active fiber ring resonators. All the theoretical and experimental results indicated that the free spectral range (FSR) of an active fiber ring resonator and the linewidth of input laser directly affect the spectral-shape and output linewidth of the ring because of the multi-peaks response of active fiber ring resonators' intensity transmitted function. For a ring with one peak output, the output linewidth is affected together by the input linewidth and the instinct linewidth of the ring, which induced that the output linewidth is narrower than the instinct linewidth.While for the one with multi-peaks output, the output linewidth is close to the instinct linewidth of the ring.Therefore using the optical fiber amplifier to compensate the round trip loss of an active fiber ring resonator,narrower linewidth laser output can be obtained.

Based on the rate equations and light propagation equations of homogeneously broadened four-level system, the numerical simulations for tellurite-based optical fiber amplifiers (EDTFA) are presented in the paper. Effects of energy transfer between Er3+ levels due to cooperative up-conversion, cross-relaxation, excited state absorption and background losses are considered here. The theoretical simulation results show a good agreement with the published experimental results. Further more, the relations between the amplifier gain and the input signal power, bi-directional pump power, and the fiber length are simulated numerically.

In this paper, the normalized nonlinear Schrodinger equation with amplifiers gain in lumped amplifiers picosecond soliton system is solved by means of the travelling-wave method and the approximate analytical solution is derived. At the same time general equations for the evolution of ampititude, center position, phase are derived. Moreover, the soliton stability in lumped amplifiers picosecond soliton system is discussed by the approximate analytical solution and general equations for the evolution of ampititude, center position, phase, and the result is that the soliton can keep stable in lumped amplifiers picosecond soliton system.

The properties of photoinduced birefringence and optical storage in azobenzene side-chain liquid crystal polymer films are investigated by means of CW laser at 532 nm and the Q-switched (8 ns) second-harmonic generation Nd:YAG pulse. According to the experimental results and numerical simulation, long-time optical storage based on photoinduced birefringence related to temperature field, molecular accumulation, molecular chain orientation are explained.

By means of LMTO-ASA method and the supercell approach, we have calculated the electronic structures of the three stable phases in Ti-N system, i.e., α-Ti, ε-Ti2N and δ-TiN. Then, we chose these stable phases as the samples of the Ti-N system and used the statistical supercell method to calculate the electronic structures of TiNx system. Furthermore, the joint density of states for TiNx system have been calculated and the results have been utilized to investigate the optical properties of TiNx system. In comparison with the joint density of states for gold, we found that the TiNx films present golden colour in the range of x from 0.4 to 0.6.

ATP is a key technology in optical communication system. There are three optical-electornic detectors used commonly: PSD (Poistion-Sensetive Debices), QD(Quadrant Detector) and CCD (Charge-Coupled Devices), among these detectors, the simplest, the most excellentest and the commonest is the QD. In this paper, we analysis and investigate explicitly the performance of QD in detection technology.

Based on the introduction and the development of PLD, the paper mainly introduces the construction, characteristic and logic realization method of MAX 7000S devices, and describes the use of EPM7064SLC44-10 chip of MAX 7000S devices in the data acquisition board of TCD142D.

The total outgoing radiance at top-of-atmosphere over the ocean contributes mostly from the atmosphere scattering. We calculated angular distribution of scattering at 0.55μm at TOA over Amoy ocean area from aerosol optical thickness measurements on ground. The outgoing radiances and the irradiances were inferred from 6 S atmospheric radiative transfer code. The calculated values of calculating total irradiance on the sea surface were compared with Pyranometer measurements, the relative errors are less then 10%.

The 610 nm AlGaInP LEDs was prepared by MOCVD on the n+-GaAs(n=1×1018 cm-3), the X-ray double crystal diffraction and spatial PL spectrum map was used to analyze the AlGalnP epitaxial layers. Through the degenerate experiment of diffent thickness AlGalnP LED in the same condition, we found that the degenerate of LED luminance diminishes with the decrease of the GaAs substrate thickness. With the calculated result, we can get that the main reason that the better reliability of LED luminance with the decrease of the GaAs substrate thickness is the decreased heat out form the thin substract, and the decrease of the GaAs substrate thickness can also help to improve the reliability of AlGalnP LED device.