The anisotropic diffusion (AD) algorithm was used to preprocess the optical coherence tomography (OCT) images for noise reduction and edge enhancement, then the phase congruency (PC) algorithm was added to improve the edge characteristics extraction, and finally Butterworth high-boost filter was appended for further edge details enhancing and noises clearing up. The novel combinations of the three algorithms were applied to process the OCT images from a pearl and retinal nerve fiber layer respectively. The experimental results showed that effective noise suppression, clear outline extraction, and characteristics enhancement can be realized.

To detect the carrier signal in the background of strong interference, a Duffing chaotic oscillator was applied to the triple-state pulse position modulation signal detection. The driving force f was adjusted in the detection process, which determined threshold fd of the system driving force. When the triple-state pulse signal was added in the system, which turned into a state of large-scale cycles from chaotic state, a periodic signal was detected in the input signals. If the system continued to be in the chaotic state, it indicated the input signal was the pure noise. Simulation results show that the method proposed can effectively detect a weak carrier signal when the signal to noise ratio is greater than -23 dB.

The radiation trapping is an important dispersion effect which can greatly affect the performance of laser gyro. Focusing on the defects of previous methods, new correction methods are presented. Based on the strict analysis of the radiation trapping physical process, the correction formula of two frequency laser gyro is presented, which can solve the defects in the Aronowitz’s method. Based on the strict analysis of mode coupling effects in four mode lasers, the correction formula of four frequency laser gyro is presented, which is in accordance with the physics essence well. It is helpful to the theoretical research on laser gyro.

The reflected spectra of GaN-based distributed Bragg reflector (DBR) for blue light-emitting diodes (LED) are studied by transfer matrix method. The results show that reflective spectra of s-polarized and p-polarized plane waves are the same at normal incidence, but both of them move to high frequency and the difference between them increase rapidly with increasing angle of incidence. Change rate of DBR reflected spectra is related to incident medium, and low refractive index of incident medium has a broader incident response. By modifying the structural parameters, it’s found that correcting the thickness of films by the angle of incidence for increasing wide-angle reflection is a good method. Coupled DBR increases wide-angle reflection at the cost of reducing reflectivity or doubled the thickness of films. Reflected spectra of coupled DBR design is better than that of the conventional DBR design, which is important to enhance light extraction efficiency from LED.

The temperature is important for the properties of laser diode (LD). For increasing lifetime of LD and obtaining steady laser output, the automatic temperature control system to control the current of the thermo electric cooler (TEC) is applied. The temperature control system consists of C8051F350 which integrated with ADC and DAC and MAX1968 with two-way current output. It uses the enhanced digital PID algorithm combining integral separating and shift integration incremental algorithm to achieve the two-way control of the temperature of LD. The result shows that the temperature of laser can reach the value preset rapidly and stably with stability of ±0.03 ℃ while LD working in range from 00-40 ℃.

The nondiffracting higher-order Bessel beams carry the orbital angular momentum (OAM). During free propagation, their transverse intensity profile remains nearly invariant in a range. The beam comprises the topological charge l helical phasefronts and carries an orbital angular momentum of lh per photon. The angular momentum number carried by the photon in each eigenmode is represented by l, and the eigenstates |l> can generate multidimensional quantum entangled states. A method of optical communication is presented that encodes information in two orthogonal orbital angular momentum states based on higher-order Bessel beams. Each photon carries OAM states of information, which can increase the key generation rate of the protocol, and offer a quantum solution for increase of the optical communication distance.

A novel scheme for realizing dense coding with Greenberger-Home-Zeilinger (GHZ) state in linear optical system is proposed. In this protocol, Alice codes on photon 1 and 2 by linear optical element and sents these photons to Bob. Then Bob performs a joint measurement on photons 1, 2, and 3 with the GHZ basis by employing two quantum nondemolition detectors (QND) and polarizing beam splitter (PBS). Eight GHZ states can be completely discriminated. According to the outcomes of his measurement, Bob can determine what operation Alice applied. Alice only transmits two photons in this process of the quantum dense coding, but Bob can obtain three bits of classical information. The QND devices are generally based on cross-Kerr nonlinearities, and the cross-Kerr nonlinearities are available with electromagnetically induced transparency (EIT).

Two schemes for teleporting an unknown two-particle entangled state via a four-qubit non-maximally entangled cluster state as quantum channel are proposed. In the first scheme, a special bipartite entangled state was teleported, the receiver Bob can reconstruct the original state with a certain probability according to the sender Alice’s measurement results, and the successful probability is determined by the smallest two coefficients’ absolute values of the cluster state. In the latter scheme an arbitrary two-particle entangled state was teleported. Contrast to the first scheme, Bob should perform a quantum controlled phase gate operation besides the unitary transformation. The considerable advantage is that it employs a non-maximally entangled cluster state as quantum channel in these two schemes. Thus, the schemes can greatly reduce the amount of entanglement resources and need less classical bits.

Synthesis of quantum reversible logic circuits means to automatically construct desired quantum reversible logic circuits with minimal quantum cost. The truth table synthesis of quantum logic, one of the most useful methods in reversible logic synthesis of quantum circuits, contains obverse direction, reverse direction and double direction synthesis. Hamming distance is defined and popularized to lateral Hamming distance, vertical Hamming distance and cross Hamming distance. The quantum reversible logic circuits compound synthesis in the popularized Hamming distance is discussed. It is shown that the compound synthesis produces better results and greater efficiency than the previous approaches.

A quantum information splitting scheme of two-qubit state is proposed by using two asymmetric W states as quantum channel. It’s showed that if the two-qubit state is known to the sender (Alice), then she can split quantum information and distribute it to the receivers (Bob and Charlie) by performing a two-qubit projective measurement. Bob and Charlie first perform a collective unitary operation on their qubits, and then Charlie can recover the initial quantum state by implementing two single-qubit unitary operations. So the scheme reduces greatly the measurement complexity. The success probability and classical communication cost are calculated within the scheme.

Wigner functions for the eigenstates of k-th power annihilation operators are constructed in phase spaces by using their expressions in Fock presentations. Based on the negativities of their relevant Wigner functions, the non-classical properties of these eigenstates are discussed. The numerical results show that, depending on the complex parameters α, the coherent states are quasi-classical (their Wigner functions are always non-negative), but the eigenstates of k-th (k≥2) power annihilation operators are really non-classical (their relevant Wigner functions can be negative in phase spaces).

The superposition state from the excited coherent state was constructed. Dependences of Wigner function on θ and m and its marginal distributions for the superposition state were numerically investigated. It is shown that the superposition state is always able to exhibit the non-classical properties for any θ, Wigner function and its marginal distributions evidently depend on θ and m.

The supercontinuum generation in high nonlinear fiber with the normal dispersion is investigated using the split-step Fourier method. The effect of the peak power of pump pulse, pulse width and the frequency chirp on characteristics of supercontinuum spectrum is analyzed. The results show that the pulse width, peak power and initial chirp of the pump pulse are very important to flat wideband supercontinuum generation. With the increase of the peak power, the spectral width becomes wider (170 nm to more than 400 nm at [EQUATION]20 dB) and the flatness of supercontinuum becomes better. By contrast, the spectral width becomes narrower and the flatness of supercontinuum becomes worser when the pulse width increases gradually. The negative initial chirp is profitable for spectrum broadening, but the positive chirp has certain impact on spectrum broadening. It is further investigated that a broadband and flat supercontinuum without residual pump is generated from such a high nonlinear fiber pumped at the normal dispersion region.

From the nonlinear Schr?dinger equation that governs propagation of picosecond optical pulses in fibers, by using simulation method, quasi-continuous-wave supercontinuum generation by using the modulation instability of single mode fibers and the high nonlinearity of the photonic crystal fiber are investigated. The forming mechanism of supercontinuum generation by using quasi-continuous-wave as the incident source was also studied. It is shown that the higher pump power and wider pulse width generate wider supercontinuum. In addition, the widening at the longer wavelengths of the supercontinuum is limited by the length of the supercontinuum, that is to say, in order to obtain a smoother and broader supercontinuum, one must use an optimal fiber length.

In order to obtain temperature and intensity effect on self-deflection of Gaussian beam in an unbiased serial photorefractive crystal circuit, assuming a Gaussian beam and a dark soliton beam are incident on the photorefractive crystal, respectively, effects of changing the temperature and intensity of dark solitons on the self-deflection of the match of Gaussian beam with one bright solitons are discussed by numerical calculation. The result shows that the bending distance of the Gauss beam centre increases with temperature rise, decreases as temperature continuously rises. All the results are useful in the engineering realization of the optical-control and thermo-control optical devices.

In order to obtain results of interaction of two-photon photorefractive sreening-photovoltaic bright spatial solitons, the interactions of two-photon screning-photovoltaic bright spatial soliton in biased two-photon photovoltaic phptorefractive crystals were numerically investigated. The result shows that two in-phase solitons attract each other and soliton fusions do occur at certain interaction length, which increases monotonously with the initial separation of the two interacting solitons. While in the case of out-of-phase, both the two-solitons repel each other with a force decreasing monotonously with the initial separation. When the relative phase between the solitons falls within the ranges of (0, [EQUATION]) and ([EQUATION]), energy transfer accompanies the interactions. The in-phase interaction results in the separation of the two solitons beams from each other, accompanied by the energy coupling between the beams, which is different from the case without diffusion field. And for the case of out-of-phase interaction, the two solitons are no longer separated simply, they are exclusive to each other but deflect simultaneously to the same side.

Zinc oxide films were deposited on fused quartz wafers using sol-gel technique and by adopting the spin-coating method. The structure of c-axis oriented ZnO films measured by X-ray diffraction is mainly decided by the post-annealing temperature. ZnO films annealed at different temperatures have a high transmittance and strong UV emission peaks which were measured by UV-VIS double-beam spectrophotometer and PL spectra. It is obvious that the annealing temperature at 650℃ is the best condition for high-quality ZnO film. The thermogravimetric analysis(TGA) of the sol was carried out, and it is found that the temperature from amorphous to more ordered state is 375℃, and crystal ZnO film is helpful to the deposition of ZnO film with high quality via the sol-gel method.

A real-time detection system of billet surface temperature measurement in furnace was designed, employing DSP as the image processing center. Two near-infrared radiation images were collected in the furnace, and the billet surface temperature was calculated using the colorimetric thermometry algorithm. The principle of colorimetric thermometry, the system hardware, software and testing effect are analyzed. The testing in the H-beam furnace show that the system can check the whole surface temperature of billet real-time, display the temperature field using pseudo-color image, and analysis the operating conditions of furnace. The relative error of temperature detection accuracy is less than 0.5%, satisfying the demand of the furnace control system.

Multi-filter rotating shadow-band radiometer (MFRSR) is a ground-based instrument and it is used to measure irradiance and aerosol. It uses automated rotating shadow-band technique to alternatively measure total horizontal and diffuse horizontal irradiances at seven wavelengths simultaneously, and then deduce direct normal irradiance. In addition to broadband silicon detector for measurement of total solar irradiance, center wavelengths of the other six wave bands are 414.3 nm, 495.3 nm, 613.7 nm, 671.5 nm, 867.6 nm and 939.3 nm. The instrumentation, the method of calibration and data processing are introduced, and then statistical properties of aerosol are analyzed using observation of MFRSR during 2004[EQUATION]2005 in Xianghe, Hebei. In order to illuminate the reliability of observed aerosol optical depth with MFRSR, the results of MFRSR and AERONET data are compared. It shows the mean differences of the two results respectively are [EQUATION] at the wavelengths of 500 nm, 670 nm, 870 nm, and the standard deviations are 0.067, 0.051, 0.050. The reasons of deviation of the two method are also disscussed.

The relationship between the ground state energy and self-trapping energy (E^{tr}~~{e-ph}) with the polar slab thickness of the bound magnetopolaron in a polar slab was studied by using the Huybrecht’s linear combination operator and unitary transformations method. [EQUATION] consists of two parts, one is [EQUATION], the other is [EQUATION], and [EQUATION] also consists of two parts, one is [EQUATION], the other is [EQUATION]. Taking KCl as an example, [EQUATION] and [EQUATION] all reduced with the increase of the slab thickness, and the self-trapping energy was stablized to a low level when the slab thickness was above 5 nm, while when there was a stable magnetic fild, it increased. The reason is probably the change of electron-phonon interaction in presence of stable magnetic field.

The propagation properties of the soliton in the photorefractive crystal under Compton scattering were studied by using the model of multi-photon nonlinear Compton scattering and nonlinear Schr?dinger’s equation. The result shows that the essence of the heat-lens effect in the photorefractive crystal is a result of the propagation and coupling of the crystal soliton and space charge field soliton. The coupling properties have the relation with not only the relative phase of the solitons in the two wave guides, but also Compton scattering. When the relative phase of the soliton is same or opposite, the energy change and its cycle change between the two solitons taken place by Compton scattering. Therefore, the overall of the soliton formed by Compton scattering is fuzzy. If the soliton propagation is along with the optic axis direction, then, the birefraction induced by Compton scattering is possible.

The guided-mode properties of hollow-core photonic crystal fibers (HC-PCFs) were studied with the plane-wave expansion method (PWE). The simulation results show that, for a given wavelength in the photonic band-gap of the cladding structure, stable fundamental core mode may be obtained only with specific vertical phase propagating constants. Moreover, the mode field distributions of fundamental core modes depend on the wavelength. When the wavelength is right at the center of the fundamental core mode transmitting curve, the mode field may be confined in the air-core perfectly. When the wavelength is near the edges of the fundamental core mode transmitting curve, the energy of guided-wave core modes may leak into the cladding of HC-PCF.