The principal ideas and advantages of laser diode end-pumped slab laser with hybrid resonator (Innoslab laser) are illustrated. The progress of Innoslab laser is outlined. The development perspective of Innoslab laser is also analyzed.

The diffraction characteristics of vortex beam through the circular aperture are studied. The purpose is to determine the number of topological charge of vortex beam based on the obtained diffraction patterns. The diffraction of vortex beam through a circular aperture is investigated theoretically and experimentally and the outcome can be achieved through experiments. The influence of the topological charge (including integer and fraction) of vortex beams on the diffractive pattern are analyzed in detail. It is shown that the topological charge corresponds with the light intensity distribution. The results may have potential application in determinating the topological charge of vortex beams, and the number of topological charge can be measured according to diffraction patterns.

There are always errors during the fabrication of hyperboloid cylinder-plane lens(HCPL). So the structure of lens does not accord with elements in theory and the collimation preference of lens is not the best. Using ray-tracing method, performance of lens used to collimate laser diode beams was investigated. The influence of lens parameter variation, structural parameters (e), reflective index and distance between light source and lens(l) on the performance of the HCPL was analytically discussed. Results show that the collimation preference of lens can get best with the suitable choice of parameters e,l. This method can be used to design a collimating system of micro-hyperboloid cylinder-plane lens with better performance of collimation and higher beam quality consequently.

To seek new infinite sequence exact solutions for nonlinear evolution equations, the formula of nonlinear superposition of some new solutions and Backlund transformation of Riccati equation are given, and combining Riccati equation with function transformation, new infinite sequence exact solutions to a set of (2+1)-dimensional dispersive wave equations are constructed with the aid of symbolic computation system Mathematica, which includes infinite sequence soliton-like solutions and infinite sequence complex solutions. The method is of significance to seek infinite sequence exact solutions to other nonlinear evolution equations.

Phase-shift grating is a key component which forms the resonance cavity of DFB fiber laser. Due to additional loss, coupling coefficient and phase-shift grating length distinctly affect the optimum output power of DFB fiber laser. These factors were investigated by transfer matrix method. Through numerical simulation, the variation of the optimum output power with the optimum coupling coefficient and grating length under conditions of different cavity loss was analyzed. It shows that the optimal output power can be obtained by adjusting the optimum grating length and coupling coefficient according to the level of cavity loss. These conclusions can provide guidance for the optimized structure in designing the fiber laser.

The dipole difference squeezing of a pair atoms is defined. The time evolution properties of difference squeezing of atomic dipole and amplitude-squared squeezing of light in the system of a single-mode squeezing vacuum field Raman interacting with two coupled-atoms are studied by means of quantum theory. Using the numerical method, influences of the initial squeezing parameter of light, the atomic initial state and the intensity of dipole-dipole interaction between atoms on the squeezing properties of atom and light are discussed.

A top-cut hexagonal prism (TCHP) was designed with a height h=3.73 cm and a cross angle α=66° between side face and the base. By using the TCHP and holographic lithography, various photonic crystals (PhCs) were fabricated including symmetrical hexagonal structure, honeycomb structure and asymmetrical structures with elliptical rods in photo-resist film. Large area of electrically switchable PhCs were also obtained in polymer dispersed liquid crystal (PDLC) film. A good agreement is obtained for PhC structures between theoretical modeling and experimental results. Furthermore, far-field diffraction patterns and electrical switching characteristics were also investigated. The smallest droplets of liquid crystals is 10 nm. The switching voltage can be decreased to 13.3 V/μm.

The cross Kerr nonlinearity effect in RY-type four-level atomic system is theoretically studied. Using density-matrix equations and perturbative iterative method, dependence of real part of third-order susceptibility on variations of additional coherent coupling field intensity and nonradiative decay rate between two ground states of atoms are derived. It is found that, by decreasing the nonradiative decay rate between the two ground states and increasing the coupling field intensity, the enhanced cross Kerr nonlinearity with vanishing absorption can be obtained at two-photon Raman resonance. The result is useful in application of all-optical switch.

The effects of electron-phonon interaction on the optical rectification (OR) is theoretically studied for electrons confined in Morse quantum wells. The wave functions and energy levels are described by perturbation theory when considering the electron-phonon interaction, and analytic expression for the optical rectification is obtained by the compact density method and iterative procedure. The numerical results for typical GaAs/AlGaAs material show that the optical rectification with considering electron-phonon interaction is over 15%～30% greater than the one without considering electron-phonon interaction. Furthermore, the correction of electron-phonon interaction effect on energies of the electron makes the peak shift to the aspect of the high energy.

Properties of dispersion-managed soliton are analyzed. Dispersion-managed soliton propagation and interaction in optical fibers are numerically simulated. If there is little difference between local dispersion and average dispersion, it is better to insert the pulse with shape as hyperbolic secant. If increasing the differences of local dispersion and average dispersion, the shape of the pulse will transform as Gaussian. Dispersion become the main factor of dispersion-managed soliton interaction.

In order to obtain the effect of system parameter change of the intensity profile of two-photon incoherently coupled spatial soliton pairs, the incoherently coupled equations of bright-dark screening-photovoltaic spatial soliton pairs are numerically solved. The effect of gating beam, partial pressure coefficient and temperature on the intensity profile for soliton pairs are analyzed theoretically. The width of soliton-pairs-intensity-profile increases with gating beam intensity greatening and it decreases with partial pressure coefficient greatening. When the temperature of crystals increases, the width of profile increases but the maximum intensity of soliton pairs decreases. It is opposite when the temperature decreases. The results are benefit for the project practice of two-photon incoherently coupled spatial soliton pairs.

In order to obtain the result of the two-photon incoherently coupled bright-dark hybrid photovoltaic spatial soliton families, the propagation of multiple mutually incoherent optical beams in two-photon photovoltaic-photorefractive crystal was numerically investigated under steady-state conditions. It is shown that two-photon incoherently coupled bright-dark hybrid photovoltaic soliton families can be established in the crystals by the mutually incoherent incident beams with the same polarization and wavelength. Such bright-dark hybrid soliton families reduce to bright-dark hybrid photovoltaic soliton pairs when they contain two components. Relevant examples are presented where the two-photon photovoltaic photorefractive crystals are of the LiNbO3 type. The research may provide theoretic basis for development of the spatial soliton theory.

Due to the tiny shift in order of optical wavelength for Goos-Hanchen (GH) shift, it is very difficult to measure it directly. A novel approach to directly observe the small optical beam shift was proposed based on the liquid crystal light valve (LCLV) and the light beam profiler (LBP). Polarization of the beam through the LCLV is investigated. It is shown that polarization of the beam changes when the applied voltage changes. The LCLV is utilized to modulate the polarization state of the beam and LBP is used to register the barrycenter of the beam. The difference between the TM and TE polarized longitudinal Goos-Hanchen shift at the condition of total internal reflection on a prism-air interface was detected. This method doesn’t need complex external processing circuit, and the experimental result shows good agreement with theoretical calculation. The method is advantageous to measure simultaneously the two-dimensional laser beam shift.

Based on sensitivity of liquid crystal index on temperature, the temperature sensor of one dimensional liquid crystal defect photonic crystal was designed. The temperature sensor property was obtained and numerically calculated using the transfer matrix method. Using one dimensional liquid crystal defect photonic crystal, an experimental system was set up for temperature measurement. The results show that the defect peak wavelength moves to long wavelength, width of defect mode transmission peaks decreases with liquid crystal parallel medium surface, and the change is reverse for liquid crystal perpendicular medium surface. The temperature sensitivity of sensor not only is larger than that of common-material defect, but also is different for material and temperature, and increase rapidly with the liquid crystal phase-transformation point. The shift of the defect peak wavelength is nonlinear with temperature.

Bonding technique of III-V group materials is important for fabrication of optoelectronic devices and realization of opto-electronic integrated circuit (OEIC). However, electrical characteristics of the bonded interface, which is very important for the device design, were seldom investigated yet. Based on the thermionic emission theory and assumption that interface states distribute continuously in the band gap, and combined with distribution function, calculation model of interface states for bonded structure is set up. This model is applied to analyze the electrical characteristics of bonded GaAs/InP wafers, which were subjected to different surface treatment and annealing temperatures. Interface state density was firstly calculated after the definition of initialized electronic barrier of GaAs. Results show that sample bonded at 550°C with hydrophobic surface treatment has the lowest initial barrier height and the smallest interface state density. As a result, it performs best in terms of I-V characteristics.

The surface morphology of the SiOx film grown on 4H-SiC by thermal oxidation was observed by scanning electron microscope (SEM) and atomic force microscopy (AFM), respectively. The characteristics of the SiOx film and the interface of SiOx/4H-SiC were studied by X-ray photoelectron spectroscopy (XPS). The Gaussian fitting of Si2p, O1s and C1s XPS energy spectra and the corresponding binding energy were analyzed. The composition variances of the SiOx film were also researched with XPS measurement on the different depths. It is expected to find out the chemical composition and state of the SiOx film grown on 4H-SiC by thermal oxidation, and obtain the characteristics of the SiOx/4H-SiC interface.

With linear combination operator and variational method, the properties of strong-coupling magnetopolaron in a semiconductor quantum well are studied. The relations between the vibration frequency, ground state energy and self-trapping energy of the strong-coupling magnetopolaron in an infinite quantum well with the well width or the cyclotron resonance frequency are derived. Numerical results of the RbCl quantum well show that the vibration frequency, ground state energy and self-trapping energy of the strong-coupling magnetopolaron increase with increasing the cyclotron resonance frequency when the well width is given. The vibration frequency and self-trapping energy increase with increasing the well width and finally approach to the three-dimensional (3D) value of the bulk material in a determinate cyclotron resonance frequency, but the ground state energy decreases with increasing the well width, and when the well width is small, the quantum size effect is significant.

Based on a sampled-Bragg-grating, a novel approach to obtain high channel-count comb filter is designed for wavelength-division-multiplexing(WDM) system. There is a non-continuous linear chirped structure like a ladder in grating. And refractive index modulation amplitude agrees with Hamming distribution. A 26-channel comb filter with channel spacing of 50 GHz is fabricated. It is able to obtain multiple equalized passbands with flat-top steep-edge and high transmittance, which can be used as optical add/drop multiplexer in WDM system.

The coexistence problem between M-WiMAX and WCDMA systems is discussed. To reduce the interference from M-WiMAX system to WCDMA system, the transmit beamforming technique is applied. At the same time, an adjacent channel interference model is proposed to analyze the gain induced by the application of transmit beamforming technique. In addtion, a novel sub-channel allocation algorithm is proposed to increase the throughput of M-WiMAX system. To verify the proposed algorithms, a system-level simulation platform is built up and evaluated by the Monte Carlo method.

A square-lattice photonic crystal fiber with gradually increasing air-holes in a silica matrix is analyzed numerically based on a full-vector finite element method with quadratic order triangular elements, and an anisotropic perfectly matched layer is also employed as a boundary condition at computational window edges. The mode distribution, confinement loss and birefringence of the fundamental mode in the fiber are simulated in details. It is confirmed from numerical results that low confinement loss of 1.31×10－6 dB/m can be realized under condition of four arrays of air holes in the photonic crystal fiber, and high birefringence can be obtained through adjusting the diameter of inner-ring air holes in the fiber, which is more obvious in the longer wavelength range. The numerical results are highly instructive for the fabrication of birefringent photonic crystal fibers.

A temperature and pressure measurement method is introduced, which is based on a cantilever with single fiber Bragg grating as the sensing element. The non-linear relationship of measurement result between temperature and wavelength is analyzed. Then the linear and nonlinear application scope of reflection wavelength and temperature is given. The linear application scope of wavelength and temperature of bare grating part and pre-strain part is －11.2℃～89℃ and 22.5℃～62.5℃. Linear responds to pressure and temperature are achieved in the measurable ranges. The measured pressure sensitivity coefficient and temperature sensitivity coefficient is 0 nm/N, 0.4082 nm/N, 0.0128 nm/℃ and 0.1346 nm/℃. The result shows that the method is simple and it makes the actual measurement of temperature and pressure facilitated.参考文献原文>Xiao Shaorong, Ben Fulai, Zhu Ping, et al. Design of two-path fiber atmospheric pressure sensor [J]. Chinese Journal of Quantum Electronics (量子电子学报), 2008, 25(5): 634-638 (in Chinese).

In order to overcome some deficiencies of the traditional optic fiber chemical sensor, the intrinsic optic fiber chemical sensor based on evanescent wave theory was proposed. The relationship between sensitivity and geometrical structure parameters, the refractive index of solution were calculated and analyzed based on ray theory. The sensors of different structure parameters were fabricated with chemical corrosion method, the experimental system was designed and the test was carried out for these sensors using the methylene blue solution. The experimental results are concordant with numerical results, and the thinner, longer the sensing area is, the higher the sensitivity is.