Cr4+:YAG is new Q-switching and tunable laser crystal. As a new saturation absorption crystal, it has more good characteristics than conventional materials. In this paper, the characteristics of saturation absorption of this crystal were described. Also, the principal problems on it's growth were introduced.

In this article,we have analyzed the effect of multi-wavelength selection in white-light interferometer on the visibility of the adjacent side fringes to central fringe. Selection rules of two and three wavelengths with short coherent length light sources,as well as some numerical simulation examples,are given. The results of this article are helpful in design of white-light interferometer.

The theory on how to obtain the information of the OPO cavity with phase-modulation side-band system is expressed. The effects of the losses for both intracavity and mirrors,as well as modulation frequency on the system for locking cavity is discussed,which provides references for the further improvement in precision and stability of frequency locking technology.

In this paper,the stratiform structure is formed from combusting gas flows of the premixed air-acetylene on burner,its interface is thought as axisymmetric spun conicoid,according to the best fitting spherical cap based on reasonable approximation,its equation of simulation curved surface is derived;the transmissivity of light and sensitivity factor with thickness on combusting flows are measured,the film thickness with different layer is revised based on measured result;while parallel input light pass through flame,the optical path difference is calculated during light propagation between the image plane and front-plane of film layer of flame,the phase change effects on phase hologram of laser is taken into consideration,the relevant parameter of phase hologram of laser is calculated;the relevant distance can be flexibly adjusted in experiments;the high quality kinoforms can be obtained.

The superluminescent diode (SLD) and ultrashort laser are the ideal light source for OCT. In this paper,a simple method was used to eliminate the edge effect of SLD,and obtain clear image of Tomography Structure. The reason of the edge effect of SLD is multimode distribution when it work in the high output power. The theoretical simulating results are agreed with that of experimental measurement.

A calibrated piston source of light,which simulates a cylindrical-volume luminosity source,has been introduced to measure the absolute concentration of illuminant particles. It is proved that this Piston Source Method is one of the simplest and most convenient ways to measure the absolute concentration of illuminant particles,especially in real time measurements of O2(a1△) in a singlet oxygen generator. The relative error of O2:(a1△) concentration is less than 20%.

Infrared solar spectra on clear days were measured automatically by an infrared solar spectrometer (ISS) capable of 0.4 cm-(-1) resolution developed by us. Precipitable water was retrieved from the recorded infrared solar spectra near 3.434 μm wavelength band,which is absorbed by atmospheric water vapor. Comparison shows that the retrieval result coincides quite well with radiosonde. The characteristics of diurnal and seasonal variation of precipitable water were obtained over Hefei from the measuremental data of nearly 18 months since April of 1997. It is found that the precipitable water is related to surface dew point temperature. The results are also discussed in the paper.

The energy transfer reaction of metastable atom He(23S) with molecule N2H4 was studied using discharge-flowing afterglow technique. The emission spectrum of excited radical NH(A3∏→X3∑+). NH(c1∏→a1△). NH2(A2A1 → X2B1) were observed. The ratios of formation products exit were obtained by relative spectra intensity. The emission rotational spectra of product NH(A3∏,v′= 0) were analysed,the results showed that rotational populations were " two models". The formation mechanism of excited products was: He (23S)+N2H4→N2H4→NH(A)+ NH2(A)+H.

By the aid of the linear quantum transformation (LQT) theory,we give a concise diagonalization for n-mode boson and fermion of quadratic Hamiltonian. It is also pointed out that an n-mode boson coupled quadratic Hamiltonian can be diagonalized by a "negative unitary" matrix which is an element of complex symplectic group SP(2n,c),and an n-mode fermion coupled quadratic Hamiltonian can be diagonalized by a unitary matrix which is an element of complex fermion group F(2n,c).

Generalized q-deformation coherent states of a non-harmonic oscillator in a finitedimensional Hilbert space are constructed and their quantum statistical properties are discussed. It is shown that there are squeezing and antibunching properties in these quantum states.

Based on the reference [4],a dipole amplitude-squared operator of a three-level atom is defined,and a dipole amplitude-squared squeezing of a three-level atom is also given with the uncertainty relationship of Hessenbery. The dipole amplitude-squared squeezing effects of a threelevel cascade atom interacting with a correlated two-mode squeezed vacuum field are investigated. Based on the numerical calculations,the influences of the squeezing parameters of the initial squeezed state field,the frequency detuning value of the mono-photon and the intensity of atomfield coupling on the atomic dipole amplitude-squared squeezing are discussed.

This paper presents the pulse laser characteristics of neodymium doped potassium gadolinium tungstate (KGW) crystals grown in our institute. The maximum laser output of a KGW rod with dimensions of φ3.4 mm×24 mm was 358.4 mJ/pulse at wavelength l.067 μm,when it was pumped with a single xenon flashlamp. The overall and slope efficiencies are 1.7% and 3.3% respectively. It can be seen from this work that Nd:KGW crystal is a promising material for miniature lasers.

A stable single-frequency fiber ring laser with linewidth less than 0.5 kHz is presented,in which the self-written fiber grating induced by saturable absorption inner an unpumped Er3+ doped fiber at the standing-wave section is applied. Its power is more than 1 dBm and the lasting time of no mode-hopping is more than 3 hours. The RF spectra were measured by the homodyne method,when the mode-hopping occured.

In this paper,a high repetition-rate Ti:sapphire laser pumped by flashlamp is reported. With two-step simmering short-pulse laser power supply which was made domestically,and a φ8 mm×160 mm Ti:sapphire laser crystal rod,Q-switched laser output energy of 195 mJ with 20-ns-pulse-width was achieved with repetition-rate 10 Hz.

A simple model is presented to describe the interaction of short-pulse,ultraintense,oblique incident,p-polarized laser with solid target and attribute the generation of harmonics to the nonlinear mixing of the transverse and longitudinal electronic currents in a very thin layer under the surface of the solid target. Based on this model,the angular distribution of the high harmonics was obtained and the dependence of the conversion efficiency on harmonic number and laser strength parameter was investigated.

Any theory has its limits of applicability including the phase-matching condition. Then we may ask whether a criterion exists which tells us when the effective frequency doubling may be discussed "phase-matchingly" and when it must be discussed " non-phase-matchingly". In this manuscript based on the actual discrete atomic structure of crystal,the limits of applicability of phase-matching condition described by Franken and Ward on the effective frequency doubling behavior are discussed. Roughly speaking a phase-matching treatment is adequate,i.e.,sufficiently accurate,whenever all relevant optical wavelengths are large compared to the lattice constant of the crystal.

This article discusses strong correlative system's free-energy with holon causing ferromagnetic polaron in the two-dimensional Cu-O plane. According to the characteristic that the system is steady when free-energy is the minimum,we calculate ferromagnetic Polaron's radius rf = a when kBT << Jeff,and put forward the probability that pair-ferromagnetic polarons leads to superconductivity.

We present the dynamical characteristic of single electron in three-coupled-quantum-dot system and a method for electron to transport in the system of coupled quantum dots. We find that the probability of electron in the third quantum dot is less than 1 unless strong symmetrical coupling condition.

In the optical soliton transmission systems using common single module optical fibers,the amplified spontaneous emission (ASE) noise and the overflow of dispersion waves are the two main factors that can cause energy and timing jitter of soliton,thus leading to some errors in bit rate of system. In this paper,we study the restraint of the ASE noise with band-limited light filter and the restraint of the dispersion wave with nonlinear gain and their stabilization to the optical soliton transmission systems. Based this the optical soliton transmission system using common single module fibers is designed.

It is shown by the results measured in the atmosphere that the eddies with temperature sharp Changing section via temperature discontinuous surface may frequently occur in an unstable stratified turbulent medium. Because the structure of temperature discontinuous surface is very asymmetrical,the properties of light propagation of turbulent medium would departure the theory of isotropic turbulence. The occurring of discontinuous surface is probably related with the removing of eddies in the vertical direction in the stratified turbulent medium. The production and removing of these eddies can be named " burst".

We developed a program to retrieve aerosol optical thickness from GMS visible channel data. It consists of radiative transfer algorithm to retrieve aerosol optical thickness from satellite visible channel radiance and the graphics user interface to show aerosol optical thickness on the Windows platform real time. With this software we analyzed the aerosol spatial distribution and variation of Bohai gulf region and obtained satisfactory results.