A new kind of nonlinear superposition coherent states are constructed. Using the numerical method, we have studied squeezing effect and antibunching effect of the states. It is shown that the quantum statistical propecties are related with superposition parameters.

The microstructure fiber (MF) based laser devices have outstanding performance comparing with the normal fiber based laser devices because of the flexible and various airhole microstructure. Based on the recent international progress on MF based laser devices, we summarize the unique characteristics of the MF as laser gain medium firstly. Then the theoretical analysis method and process of MF based laser devices was discussed. Finally, the characteristics of Er3+-doped, Yb3+-doped and Raman MF laser or amplifier are analyzed and discussed, respectively.

Tunable diode laser absorption spectroscopic(TDLAS)technology applies the wavelength tunable characteristics of diode lasers to gain the absorption spectroscopy of the selected absorption line of the target gas for the qualitative and／or quantitative analysis of the pollution gases in air．In order to get the required sensitivity in trace gas monitoring and gas leak detection，based on the idiographic requirements it generally needs to adopt diferent laser modulation techniques like wavelength m odulation amplitude m odulation ． frequency or phase modulation and so on，with combination of long path absorption cell and assistance of various noise suppression techniques．TDLAS has significant advantages not only in sensitivity and high selectivity but also in rapidity of response．It has been extensively utilized in monitoring of various pollution gases in troposphere and atm osphere． and also in location the source of toxic or hazardous gas leak．W e report a TDLAS—based instrument recently developed bv our group for the measurement of CH4 in atmosphere． This instrument possesses advantages of fast response(faster than few millisecond)and low detection limitation f<100 ppbv1，and it could be easily assembled to a portable gas monitor． Furthermore，if the laser wavelength could be tuned in covering the range of 1．3一1．8“m or installing few narrow DFB tunable lasers to cover the range of 1．3一1．8 m，simultaneous monitoring of the major atmospheric pollution gases inchlding CO2、CH4、CO、CH2O、H2S、NH3、HCI、C2H2 and s0 on could be realized．

ptical code division multiple access (OCDMA) system is one of the most competitive multiplexing technologies and will be widely applied in the field of optical communication. The scheme fiber-optical OCDMA system was analyzed in details. The strategies in the designing of encoder/decoder were compared and evaluated. Especially, the encoder/decoders based on fiber Bragg-grating and arrayed guide grating are discussed. The future application of OCDMA in the field of optical communication is predicted.

By the truncated expansion and Jacobi elliptic function expansion methods, we have found some exact solitary wave, rational formal, triangle function and elliptic periodic solutions of the general variable coefficient KdV equation with external force term.

From Maxwell's electromagnetic theory, dipole approximation method is used to deduce the coupling constant between the optical field and dielectric nanometric spherical particles. It is found that the best resolution still exists in the near-field optical microscope for these dielectric particles and happens at the position where the far field counteracts the near field.

The simple gas cell was made, and the SERS spectrum of acetylene and ethylene adsorbed on silver and copper substrate prepared by the nitric acid etching method were studied. The good enhancement was observed. A new method will be promoted for microanalysis of harmful gas.

Physical background of deformable model is described. Then, an approach of finding the contour of an object based on quantum mechanics is obtained by introducing the point of view of the quantum mechanical law of motion of a particle into extraction of object contour and estimating the probability (relative probability) that a particle goes from a point to another point. Next, Smoothing of the extracted contour is considered. Finally, this method is applied to both simulated images and real medical images.

Image fusion method based on a new class of wavelet non-separable wavelet with compactly supported, symmetric, orthogonal and dilation matrix is presented. We first present a new constructing method of two dimensional 4x4 symmetric filter bank. Using this method, we construct a non-separable wavelet 4-channels filter bank. The images involved the fusion were decomposed by the filter bank. We use the fusion algorithm as follow: for low-frequency part, the average value was selected, and selecting the center pixel value of the local area window whose the energy is bigger for the three high-frequency parts of each level, then the new image was reconstructed. The method's performance was evaluated by using the entropy, cross-entropy, mutual information, error of mean square root and points signal to noise ratio. The experiment results show that it has good effect for the fusion of visible image and infrared image, far infrared image and near infrared image, aero image and satellite image, multi-focus images and many others class of images.We can obtain the fused image whose edges is no distortion.The performance of the non-separable wavelet fusion method is better than the performance of the haar separable wavelet fusion method.

Generation and reconstruction of computer-generated hologram(CGH) of images display on spherical surface by use of conformal maps is presented. Usually the reconstructed image is located on a planar plane when the hologram is illuminated by a plane wave. Conformal maps are corresponding relationship between planar and curved surface and widely used in computer graphic. Comparing with simply coordinates transversing, Conformal Maps have many advantages, such as they make the invariability of geometric form between origin images and reconstructed one. We combined conformal maps with the generation of CGH, realized the generation of computer-generated hologram of a two dimensional (2-D) image which displays on spherical surface and reconstructed the original image from generated CGH, therefore, realized the computer simulation of holographic record and reconstruct process. As reconstruction of a 2-D image on a spherical surface actually creates a three dimensional (3-D) displays, this technique may plays an important role in attempts at reconstruction of 3-D images from CGHs.

Based on the ideal opening model for the laser resonator and its coherency modal theory in the space-frequency domain, evolution rules of complex spatial coherency of optical fields in the resonator with spatial-phase modulation are investigated by numerical simulations. The physical mechanism of these phenomena is presented and discussed. Results from numerical analyses show that, with increases in the number of reciprocating times of optical fields in the resonator, the complex spatial coherency trends to be completely coherent, while their evolution rules are greatly different for different spatial-phase modulations.

The first Stokes radiation (S1, 395.6 nm) of SRS of CH4, pumped by a pulsed Nd:YAG laser at 355nm, is used as λon of NO2-DIAL. A numerical study is done, aiming to explain qualitatively the practically important physical behavior of the configurations. And a series of experiments are reported here on the generation of Stokes orders generated in CH4. By adjusting pumping laser energy, beam quality and the pressure of gas, the relationship between them and the energy conversion efficiency of scattering radiations is obtained. Finally, the appropriate condition to optimize S1 is found.

A temperature-control system for high-power semiconductor laser-diode with high precision was presents. In the system, a thermoelectric cooler was used to control the temperature of the laser-diode which realized the totally solid cooling system and a digital PWM power amplifier with high-precision was designed based on the characteristics of thermoelectric coolers. In the implementing process, single-chip micro-computer was used, and fuzzy PID method of which the parameters were self-turned on-line and nonlinear ompensation of the thermistor were accomplished through software. The results show that high control precision and small scillation can be gained and the temperature-controlling error of the system is ±0.06 ℃.

The rates of quantum key distribution systems are too low, the interleaving technique and interpolation technique are used to extend the capacity of quantum key warehouse in order to advance the quantum key rates of quantum security communication systems. The simulation shows the interleaving technique and interpolation technique can extend random sequences and their randomicity are invariable. The correlative theory and technique of digital signal processing is an effective method of extending quantum key warehouse.

The nonlocal quantum gate is discussed. We also propose a scheme for probabilistic implementation of nonlocal controlled-not operation via a nonmaximally entangled quantum channel.

The squeezing properties of a light-atom interacting system are studied by means of quantum theory. In the system, two two-level atoms are initially in an entangled state, and the coherent optical field in a Kerr medium is in a coherent state. Influence of the coupling constant ga of dipole-dipole interaction between atoms and the coupling strength x of the Kerr medium with the optical field on the double atoms dipole squeezing and optical field squeezing are discussed by numerical calculations. It is found that under weak optical field condition, large ga and x weaken the atomic dipole squeezing;and under strong optical field condition, large ga increases the optical field squeezing events while large x reduces the frequency.

The squeezing properties of light field interacting with the A-type three level atom via intensity-dependent coupling are studied and the influences of detuning between the atomic transition frequency and the light frequency in single-photon process and the initial squeezing of light on the light squeezing are discussed emphatically. The results show that both the detuning and the initial squeezing of light strongly influence the squeezing of field. The light squeezing remains continuous if the detuning is big enough, but if the detuning is little the light field will be squeezed periodically. The bigger the initial squeezing factor of light is, the deeper the light squeezing is.

Interaction of thermal radiation field with atom are studied. We find that the field may exhibition photon antibunching and photon sub-Poissonian distribution. We also study the photon statistic properties of thermal radiation field in the process. It can be find that average photon number of thermal radiation field and multi-photon transition process have intense influence on the non-classical properties.

The photonic band structures of two-dimensional square compound lattices made of two kinds of dielectric cylinders are calculated by the plane-wave method. Absolute photonic band gaps common to E and H polarized waves are created when given proper structure parameters.

By constructing a response system, which has the same structure as the parameters-unknown drive system, a parametric adaptive control algorithm is adopted to obtain the synchronization. When the synchronization is achieved, the parameters of the response system are in good agreement with those of the drive system, and the parametric adaptive control low will automatically disappear at the same time. As a consequence, the parameters of the drive system are readily to be determined. Rossler system is used as an example for detailed description. Numerical simulations show the feasibility of the proposed control strategy.

Organic compounds containing a variety of functional groups have been analyzed using aerosol time-of-flight laser mass spectrometry designed in our lab. Positive laser des-orption/ionization time-of-flight mass spectra (LDI-TOFMS) and it's formation mechanism have been acquired for phenol, aniline, 1, 3-dichlorobenzene, nitrobenzene. The results show that the single aerosol particles of aromatic compounds can easily lose a electron to form a molecular ion spectrum , and its functional group is liable to disintegrate, too. This can offer some basic information of some aromatic group aerosol particles and the interpretation and analysis method of atmospheric aerosol.

Observation of CO2 by combined near-infrared tunable diode laser with direction absorption spectroscopy and wavelength modulation spectroscopy around 1.31 μm was presented. A minimum detectable absorption line intensity of 3.769 ×10-27 cm-1/(molecule·cm-2) was achieved at the pressure of 5 Torr, with a corresponding SNR of 16.8.

The characteristic of metal heated by laser is the convergence of energy. The unsteady temperature field founction of concentrated themal source is the foundation of this kind of problems. By the method the response times of metal heated by laser was derived and compared with experiments.

An equivalent circuit model is derived on the base of quantum cascade laser 's rate equation by analyzing the unipolar behavior of electrons in quantum well , and the frequency response characteristic of QCL was obtained by the circuit simulation of PSPICE program. Consequently some factors were analyzed which can affect the modulation characteristics of QCL.

AlGaInP:Si/GaInP:Si and AlGaInP/GaInP multiple quantum well structures were grown by low pressure metalorganic chemical vapor deposition. The effect of Si-doping on the characteristics of AlGalnP/GalnP multiple quantum wells was studied by using double crystal X-ray diffraction and photoluminescence. The results show that the growth rate of MQW increases with Si-doping and the intensity from MQW with Si-doped was approximately one order pf magnitude stronger than that of undoped MQW.

On the basis of the modified random element isodisplacement (MREI) model, a new model is set up. The dependence between the long-wavelength optical phonon frequencies and the composition of mixed crystals XB1-xCx belonged to Ⅲ-Ⅴ semiconductors is calculated. The second neighbor force constants are assumed to be far less than the first ones. Instead of a linear variation, the two first neighbor force constants can be evaluated to be a negative exponent variation with the composition, using the overlapped repulsive potential of the ion crystal combination. At last the calculated result of three mixed crystals, AsAl1-xGax, GaP1-xAsx and SbAl1-xGax, is found to be in good accordance to the experiments.

The technology of optical burst switching and wavelength conversion is introduced. We simulate the optical burst switching based on NSFNet network. We choose self-similar traffic as source, JET signaling protocol and LAUC-VF scheduling mechanism. In order to decrease the burst loss probability, we add wavelength converter to our network. We simulate the OBS network with and without wavelength converter, and contrast the result and analyze it.

Basing on EQC, this paper propose a new coding scheme of wireless optical CDMA. In the new coding scheme, the two dimension " different chip and different polarization aspect " codeword structured easily by using one dimension EQC and polarization technology. The advantage of this coding scheme is the capacity is improved by p(p-1) times in the same condition.

Effect of initial chirp on femtosecond optical soliton time characters and spectrums has been studied by analyzing second-order and fundamental femtosecond soliton transmission numerically by use of the split-step Fourier method. We show that initial chirp, which can greatly effect the main spectral lines' redshift, consequently, can greatly effect the soliton retardation caused by Raman effect. The femtosecond soliton retardation is strengthened by positive initial chirp but decreased by negative initial chirp.

The influence of optical fiber nonlinear damping on bright-like-soliton propagation properties is investigated by using perturbation theory on it's propagation properties in optical fibers, and the dynamics equations for it's parameters is derived. The result shows that optical fiber nonlinear damping effect on the amplitude, pulse width, chirp, frequency and phase, but don't on the position of the bright-soliton-like pulse in convenient monomode optical fibers.

Designed L-band SFS and broad band SFS. The 3 dB bandwidth of L-band SFS is 1565-1610 nm and that of broadband is 1550-1607 nm. The total efficiency of it is 12.3%.

In dispersion decreasing fiber, the effect of initial chirp on the quality of soliton-effect compression is analyzed by simulating the transmission of picosecond pulse numerically. By analyzing the change of compression factor, optimum fiber length, peak power of compressed pulse and compression quality, we have found that good compression effect will be obtained if initial chirp is added on pulse in dispersion decreasing fibers.

The relation between the stability of scanning system and remote sense instrument is theorelically analysed under equal time sampling controlling technology. It is reported that equal angle sampling can be used in scanning and imaging system in the future. Clarity out-room pictures of IRFPA have been obatined in our IRFPA scanning and imaging system by the use of equal angle sampling technology and equal time sampling technology.

The calibration of sun photometer was carried out and information of ocean aerosol properties with multi-bands sun photometer was obtained. The result show that a Junge aerosol size distribution parameter is 3.0017. Aerosol model is resembles to Continent model.

An instrument for the measurement of atmospheric coherence length is described. There is a light beacon on the captive balloon, atmospheric coherence length along bevel propagation path are measured via differential image motion measure angle-of-arrival fluctuation of optical wave. In addition, the profile observation results are used to check the results of the atmospheric coherence length measurement, and they are consisted quantitatively.