The effects of various factors such as interaction length, losses in Kerr medium and incident-beam intensity on self-diffraction efficiency are studied by using theoretical model on for ward-four-wave-mixing. The effects of phase-modulation, phase-mismatch andtwo-wave-mixing terms are clearly identified. Further theoretical analyses are given.

The wide band characteristic of fused fiber couplers is studied in this paper.Two fibers of stepping refraction index with different thickness at the coupled zone made by itching method are used to from an unsymmetrical arm. Thus a single mode directional fiber coupler is obtained with wide band and smaller size. Experimental results show that the coupled power can be flat distributed near a given wavelength and <100% splitting ratio by controlling the coupling length. A wide band coupler with different splitting ratio can be obtained by controlling the dianeter ratio fo two coupled arms.

One of the limitation of speckle correlation interferometric techniques including shearography is that the rigid Any motion yields decorrelation of speckle patterns before and after deformation which results in the deterioration of fringe visibility. This peper proposes a method which can effectively tolerate rigid they motion. It involves rearranging the recorded speckles before and after deformation in order to enlarge the speckle size, averaging speckles to improve the quality of fringe Patterns, and reconstructing fringe patterns and iteration of smooth to further suppress the speckle noise to obtain decent result.

In consistent with the human visual characteristic, a new transform method of color space is presented on the basis of CIE international color standard system and Munsell color system. This method is suitable for color image enhancoment processing and greatly increases the detail resolution of gastroscope color image without destroying the color balance. It has been proven to be a high practical color space transformation and color image processing method.

A direct twos complement parallel array multiplication algorithm is introduced for digital optical computing without carries. In contrast to the conventional 2' s complement algorithm, the proposed version has no restriction on the bit number of the operands and uses space bandwidth product more efficiently. On this basis, complex operation is available with a two-stage array architecture. Correspondingly, an optical experiment is demonstrated.

Optical interconnection networks have important potential applications in the fields of super-computers and photonic switching network systems etc. Based on the prism gratings and the 65 ×65-array Dammann grating designed and fabricated by us, we implemented the 64 ×64 crossover interconnection functions by using free-space optical interconnection technology. Calculations about output patterns of crossover interconnection functions have been made, which are agreement with our experimental results.

The light field transformation in the P8raboloidal mirror is discussed. The condition for obtaining an exact Fourier transform relationship is indicated. The imaging characteristics and the influence of focussins error are analysed.

The Kukhturev single-donor model of recording and reading of holograms with photorefractivecrystuls Bi12SiO20-type is amended by the two-donor model. The diffraction efficiency of hologram is discussed by using this two- donor model. A generalized formula for describing diffraction efficiency has been obtained.

A new method for measuring the laser beam quality factor M2 is Ptoposed based on the shearing interference in this paper. This method is beneficial to accuracy,simplicity and university. The principle experimental result and error analysis are presented.

A new method based on the symmetrical optical system is described for correcting laser-diode astigmatism. Some of the collimating and re focusing optics are given.

Geometric properties of the forward and reverse modes of unstable resonators with 90°beam rotation (UR90) are analyzed. Requirements for reverse mode nonstopping oscillation are discussed. The ray tracing equations of the ideal UR90 are obtained. Sauce self-average effect for laser gain medium is investigsted.

A ten-element InGaAs strained-layer single quantum well laser phased array coupled with corner reflectors (CRLA) was designed and fabricated by using reactive ion etching (RIE). A far-field pattern with main single lobe was obtained in a larger current range up to 4 ×threshold. The narrowest beam width measured for the main lobe was 0.64°, near the diffraction limit. The mode characteristicsof CRLAs were analyzed and simulated by using the Perturbation theory, taking into consideration the inter-coupling between longitudinal and lateral modes caused by the corner reflectors, and the anti-index guiding caused by carrier injection into InGaAs active layer. The results show that the coupling with corner reflectors is a new kind of coupling mechanisms for phase-locked laser array; and the main lobe corresponds to in-phase locking, while the side lobes correspond to the higher order eigenmodes, as the result of periodical perturbation.

The operating characteristics of the two-medium laser amplifier are simulated numericaaly for the first time. It is shown that the two-medium laser amplifier can satisfy the requirement of both high energy extraction and ultrashort pulse amplification.Some schemes are suggested for solving the problems which may arise in the related experiment.

The papaer describes an automatic optical alignment system for laser-fusion facility. Technical problems concerning the beam centering sensor, laser and the computer etc are discussed. The experimental result on the accuracy of beam centering aligment is<±1% of the beam diameter.

The preliminary design of a new pseudospark (PS) chamber - high power,intense current density, lower emittance and high brightness electron beam source driven by a modified water - filled Blumlein pulse-forming line is presented. Based on the hollow cathode (HC) effect and the pseudospark empirical formulus, various data including the HC and the cathode-anode distance, the working gas pressure region are given. The general experimental scheme of a high-brightness PS-produced electron beam source is shown.

Output with peak power of 75 kW per pulse and fluctuation less than ±1%have been obtained from a Nd: YAG slab laser side-pumped by a quasi-CW 60 W laser diode array. The optical-optical efficiency of 15 % and slope efficiency of 29 % aremeasured.

The experimental result of diode-pumped intracavity-doubled Nd: YVO4 laser was reported. The output powers of different doped Nd: YVO4 crystals were compared.The maximum output power at 532 nm was 22.2 mW with the optical efficiency of 3.5%. We also investigated the output character of the intracavity second harmonic generation.

In this paper we discuss the polarization characteristics of a He-Ne laser with a rotatable quartz plate in its cavity (LRQP). We have found that the output of the LRQP is two mutually Perpendicularly plane polarized light. Most importantly, it is obsevered that the polarization orientations of the front beam and the back beam from laser tube are different. There is a relative rotatory angle between them. When we rotate the quartz,the polarization orientations of both the front beam and the back beam vary with the rotation of the quartz plate. And the relative rotatory angle between the front beam and the back beam changes too.

Three types of Nd-doped phosphate glasses were laser preirradiation processed by CW CO2, Nd:YAG and Cu vapor lasers, respectively. Effect of laser length wave and irradiation condition on phosphate glasses at 1. 06 μm laser damage thresholds are investigated.

A three-temperature-zone gradient transport technqiue has been developed for growing qualified BaTiO3 crystals. The lowest temperature zone (A zone) is the surface region, where seed is continuously lifted. The highest-temperature zone (C zone) lies on the middle of the crucible, where the temperature is the highest so as to dissolve the cyrstal embryos and clusters removed from the nutrient. The bottom of the crucible (B zone) is filled with nutrient, which is hotter than the surface region. Samples of commercial BaTiO3 photorefractive crystals are routinely grown with dimensions of approximately 30 mm×30 mm×15 mm. Lattice constants and DTA of BTO measured.

This paper reports the results of theoretical analysis and experimental research on fiber Fabry-Perot filter. The fiber Fabry-Perot filter with finesse of 300 and finesse of 80, insertion loss less than 4 dB are obtained.

The theoretical analysis on the characteristics of the in-line single mode optical fiber state of polarization (sop) controllor is given in this peper. The resultS show that there exist eight paths in the sop controller to realize the transformation between any two sops. The experimental results are concord with the theoritical analysis properly.

A mathematic model including ultrashort optical pulse generated from semiconductor laser, chirp eliminated by F-P spectral window and nonlinear optical pulse transmission is established. Numerical simulations agree well with experimental data.Furthermore, it is shown that the quasi-soliton pulse with chirp eliminated can propagate stedily over a long distance.

EPR studies on Ti:Al2O3 crystal with different orientations of the optical axis of c with respect to the septic magnetic field were performed at 93 K and room temperature. A strongly anisotropic resonant line at 93 K with g=2. 00, and lines with g = 2. 00 at room temperature were attributed respectively to the electronic spin transtions of the first and upper excitation energy level 1E1/2 and 2A1 of the ground state of Ti3+ ions in Ti:Al2O3 crystal. The assignments were in agreement with both the far infrared spectral measurements and g factor calculations using crystal field theory.

The steady-saute photoluminescence, transient photoluminescence and Fouriertransform infrared spectra on An-porous silicon are reported. The effect of An induced surface electronic states on photoluminescence of porous silicon is discussed.