The noise of wavefront sensor is a major noise source in adaptive optics system. Based on the infrared adaptive optics system at 2.16 m telescope, the photon counting noise of wavefront sensor which is photon counting shearing interferometer, and error propagation in the course of close loop are analysed in terms with servo control system. The noise power spectra, servo transfer function, the open loop and closed loop RMS noise error are deduced theoretically. The experimental results are presented.

In this paper, a spectral characteristic of two ring-three fiber mutually coupling filter has quantitatively analysed by assuming a total-amplitude coupling coefficient in the weakly and strongly coup0ling sections of the fused biconical structure to be equal to the amplitude coupling coefficient in the filtering network equations. The measured passband profile of the experimehntal filter is basically in agreement with the theoretical one. The measured center wavelength, regraction, half-power bandwidth and insertion loss of the investigated filter are 1.27 μm, >1.3 dB, 72 μm and 3.9 dB, respectively.Dark soliton pairs propagating in the birefringent fiber with the normal dispersion exchange the energy periodically by coupling between them. The energy of one dark soliton may be transformed to another, so the birefringent fiber can be used to make the optical switching. The switching condition for the birefringent fiber with the ellipticity angle 35° is discussed, and switching phenomenon only appears when the pulse is input with a special polarization angle. The formula related to the length of fiber, difference of phase and initial relative energy difference between the soliton paris are presented.

On the basis of the nonlinear schrodinger equation with the perturbation, the formulas are obtained diretly from the approximative 2 soliton solution to describe the soliton interaction in the practical optical fiber soliton communication. These formulas show that the soliton interaction in practical communication not only depends on their relative phase difference but also on the changes of their energy and velocity difference with the transmission distance. The extended soliton interaction theory can be applied to discuss generally how the perturbations impose effects on the interaction. And the extended theory also can give explanations to the experimental phenomenon about the short-range interaction and long-range interaction reported in Optical letters in 1987, 1989, 1990.

A visnal pattern recognition network and its training algorithm are proposed. The network is constructed of a one layer morphology network and a two layer modified Hamming net, which can implement invariant pattern recognition corresponding to image translation and size projection. After supervised learning, the visual network can extract image features and classify patterns. More over an optoelectronic architecture for real time pattern recognition is proposed.

Novel phase shift and carrier techniques for measurement of in-place displacement field are proposed. In shear beam ESPI (Electronic Speckle Interferometry) the illumination beam is split into two wave fronts by a prism. Laterally movements of the prism introduce phase shifts. A small angle wedge is set behind the prism. A rotation of the wedge produces carrier fringes. The movement of the prism or the wedge can be controlled precisely be mechanical or electrical mechanism. digital image processing algorithms, phase iteration and FTM (Fourier Transform Method), are used to extract defoemation information. Theores and thier experimental demonstrations are presented.

This paper describes the theory about the finite element method (FEM) solution for the forward model of optical CT, and gives numerically simulated results of the FEM solution to 2 dimensional circle problem. These results are of importanc to the theoretical and experimental study on the forward and inverse photon transport in tissue in optical CT problems.

A new method combined aperture by in plane scanning laser sheet for reducing speckle in laser sheet 3 D sensing is suggested. Scanning the laser sheet within the sheet plane, a dynamic speckle field is shifted on the image lens of CCD camera. Image speckel is occurred on the image plane of CCD, the time integration of the CCD equals to averaging of the image speckle. So the speckle noise is reduced. This method is similar to the moving aperture within a "combined lens" on the image lens, which is larger than the actual aperture. An analytical description is presented and verified experimentally.

The exposure characteristics of prehardened dichromate gelatin (DCG) used as photoresist to resist enzyme etching are presented herein. The experimental results and the effect of three primary factors on the exposure characteristics are discussed.

The basic principle of stereo imaging for surveying of earth terrain from space is described in this paper. Three stereo imaging methods are discussed. A set of stereo imaging system consisting of three CCD linear array scanning cameras is designed and manufactured. The stereo imaging experiment in lab are completed. Necessary softwares for stereo imaging are compiled. Expectant 3D images of terrain are obtained in the experiments.

An ArF oscillator amplifier excimer laser was developted. Using a thyratron as a switch, discharge jitter of the laser system was effectivelly overcome through matching main charge and discharge circuits. It was achieved that amplify index 50 of the system, pulse energy 50 mJ, and a beam divergence lower than 0.20 mrad.

The GaAlAs/GaAs material with gradient refraction index separate confinement single quantum well structure has been grown by MBE method. PL spectrum, double crystal X ray diffraction and electrochemical CV profile in the sampls have been measured. The experimental results show that sample′s quality has reached requirement of design. Manufacture of laser diodes with the material has obtained preliminary result.

Yb:YAG crystal was grown by czochralski method, and an adequate annealing condition was determined to remove all of the color and most of the strain in the crystal. Spectral properties of Yb:YAG crystal were studied as well as the influence of crystal defects on its spectral properties.

Multi pulses and single pulse laser induced damage to optical glasses was studied. The damage mechanism by multi pulses laser was analysed and it was concluded that for multi pulses thermal and structural defect accumulation induced material damage. The suggest for improving material anti damage induced by multi pulses is given.

The quality of a laser beam passed a disturbed thermal blooming cell is observed using self pumped phase conjugator (SPPC) in the dynamic and stable state. In the experimental study of the dynamic state, the method so called “preplaced grating” is used.

Considering the frequency dependence of waist size on the cavity modes, an analytical form of the ultrashort pulsed Gaussian beam is derived by using a complex temporal varible, which contains all the information about the spatial and temporal properties of the pulsed beam. The real part of the complex time gives the pulse traveling time, which is related to the wavefront. The imaginary part gives the information of spatial distribution and the crossed part gives the coupling between space and time on propagation of the pulse. Then the space-time characteristices of a transform limited Gaussian pulse and a Gaussian pulse with linear chirp are analyszed.

A new technique for fabricating continuous relief micro optics elements (MOEs) has been developed. At first, the binary pattern on the object plane is transformed into continuous grey image on the recording plate by using the exposure system with movable object plane. And then the silve image is in term transformed into harden laten image by using silve halide gelatin processing procedure. Finally, this laten image is developed by enzyme treating. The principle analysis and experimental demonstration are described as well in this paper.

The reflectivity measurement of a soft X ray multilayer mirror is carried out successfully by splitting the spectrum from a flat field grating spectrometer into two parts. The variation of the reflective characteristics vs incidence angle is observed. Some of the key techniques and experimental results are presented and discussed.

The time response characteristics of negative nonlinear intercalation photoswitch are discussed based on the photo induced thermal effect. Under the adiabatic assumption the thermal conductivity equation and two other thermodynamics equations are applied to analyses the factors that influence its total internal reflection response time. With this theoretical model the materials referred by Strobl are calculated.

Principle of the acousto electro optic effect is analysed in this paper, and the theory is verified with a Lithium Niotate anisotropic acousto electro optic device.

The analytical solution for resonant reflection of a two level atom by an evanescent laser wave is presented. Consequently, We numerically calculate and theoretically analyse the atomic reflection coefficient as a function of Rabi frequency and the kinetic energy of the atom moving along the y direction.

The dynamical properties of a three level cascade atom interacting with pair coherent state are studied. Both Rabi oscillation and the time evolution of the cross correlation function show collapse and revival phenomena whether the individual field modes are detuned from the intermediate atomic level or not, but the times of collapses increase quickly with increasing the detuning amount. We also observed that the modes of pair coherent state show both correlation and anticorrelation depending on the time of observation.

Absorption spectra, emission spectra and excitation spectra of Er3+ ions in fluoroindate glasses were measured. The Judd Ofelt parameters Ωt(t=2,4,6) of this glasses were calculated. The calculation results of luminescence properties (Ajj′, σр, β, τ0) of Er3+ ions in fluoroindate glasses were given, and compared with Er3+ doped fluorozirconate glass, the influence of glass hosts on the luminescenceof Er3+ ions was explained.

A time and space resolved diagnostic technology was used to study the emission spectrum from the plume produced by a pulse laser that irradiated on the surface of Al target. The velocity of the plume generated by laser ablation was measured and the ignition mechanism of plasma in air was discussed.

Organic Electroluminescent (OEL) devices using trivalent terbium (Tb)complex as emitter were fabricated. The cell structure was glass substrate/In SnO(ITO).poly(N vinylcarbazole)(PVK)/Tb complex/Al, the hole transport layer and the emitter were fabricated by spin coating on ITO and vacuum deposition, respectively. The EL spectrum consists of sharp emission lines from Tb 3+ ions. Luminance of 210 cd/m 2 was achieved at drive voltage of 15.4 V. This is the highest luminance so far we know, obtained from the OEL cells with Tb complex as emitter. The theory of rare earth's luminance is discussed through measuring and comparing the cell's spectra and electric property.