The wavelength tuning and stabilizing techniques of semiconductor lasers are impor- tant for a variety of applications such as optical communications. In this paper, different kinds of wavelength tuning and stabilizing techniques are reviewed.

In recent years, Yb:YAG has been regarded as a way of developing high power and high efficient diode pumped solid state laser(DPSSL). We briefly present the very promising properties of Yb:YAG as laser active material, most of them clearly superior to Nd:YAG in diode pumped applications. The thin disk laser concept was summarized. The experimental data and the diode pumped Yb:YAG thin disk laser setting which achieved 16 W CW ouput laser were demonstrated.

Optical-absorption spectrum of Ho3+ ions in oxyfluoride glass ceramic was measured, from which the measured oscillator strengths were obtained. The Judd-Ofelt intensity param- etersΩ( = 2,4,6) were determined by a best fit of the calculated and measured oscillator strengths, the rms deviation was 3.5 ×10-7. Some predicted spectroscopic parameters of the ex- cited states, like the spontaneous radiative transition rate, radiative lifetime, branching ratio and integrated emission cross section were given using the intensity parameters. The spectroscopic parameters were comparable with some laser materials, and some of them were better.

In this Article, Surface photovoltage method has been used to measure the photovoltaic effect of strained InGaAs/GaAs quantum well with different composition of In and width of well at different temperature.The transition peaks of PV spectra were identified compared with the theoretical calculation by the kroig-Penny model . The theoretical calculation results agree with the experiment ones.

After introducing the characterastics of FC(n) and LiNbO3 superlattice systems con- structed following FC(n), we analytically obtained the formulae of the output power of the second-harmonic-generation light and the efficiency of the output power versus input power by means of the small-signal approximation. The relationship between the output power per unit area of the second-harmonic-generation light of ordinary-light s(2ω)0 and the wavelenght of the fundamental beam was given. It was found that there exist four harmonic spectral lines with high transforming efficiency in visible light zone. The similar result was also got but the number of the lines is six. In this paper two kinds of interesting vacancy effect were discussed.

The wave-function of the system of two-mode squeezed vacuum field interacting with N-type four-level atom is solved exactly, and tile quantum properties of the light in the system are studied by means of numerical method. The results of the studies indicate that the fluctuations of two quadrature components of light can be squeezed periodically, and this squeezability is related to the initial state of the system. The statistic properties of the photon depend on the initial state of the system, and the correlation of the two mode of light is non-classical.

In the paper, double-wave function quantum theory is applied to description of mesoseopic LC circuit and the quantum fluctuations of charge and current are investigated.

Using the trial function method, the exact wave functions of the time-dependent driven harmonic oscillator with time-dependent mass and frequency are obtained.It turns out that the wave functions are squeezed displaced Fock states.

By using the Pegg-Barnett theory it was studied the phase properties of a three level atom interacting with the coherent field when the cavity is supposed to be filled with an added kerr-like medium. The property of the evolution of the phase probability distribution was given and the field-medium coupling was discussed.

In this paper we have simply analysed the mechanism of polarization remote sensing detection and the advantages contrast to intensity remote sensing detection. We also pointed out the wide application of polarization remote sensing detection in the future. On the base of 863 Projects, we have designed an optical system of the airborne multi-band polarization remote sensing. At the end of paper, we presented the system's application results.

Heat release rate is the most essential parameter for combustion process,and often employed to study the dunamic supression process of a pool fire under water mist application.Based on oxygen consumption theory,cone calorimeter is widely used to measure the heat release rate of a fire. However, one of the main simplifying assumptions of this technique is that the incoming gases into the susten only come from ambient atmosphere.When water mists are applied to the pool fire.some of them would be heated and evaporate into water vapor,so the incoming gas concentration would be affected ,resultig in signifecant bias of the heat release tate measurement.In this paper a simple method to reduce this effect due to water vapor was develped and the heat release rate of the pool fire interacted with water mists was studied using the cone calorimeter.The factors such as pool scale,fuel type and water mist volume flux were considered in the experiments.The heat release rate was reduced signifcantly when water mists of adequate flux were applied to the pool fire,and however was enhangced with water mists of small quantity .As regards to some incomplete combustible fuel sample,the enhangcement effect was obvious.

Photovoltaic transient responses have been studied in theoretic model and experiments. A new effect has been discovered that will promote the application of new photo-electron cells. We have provided a new measurement in detecting photovoltaic response in the paper.

The paper introduces embedded real-time, multi-processing operating system pSOS, and studies the application of the pSOS in the micro satellite software based optimization in pSOS.

A precise temperature control system using DS18B20 for high power laser diode is introduced in this paper. In our system, we use the digital thermometer DS18B20 as the sensor, microprocessor as the kernel component, to control the thermal electrical cooler. The characteristics of this system are its little size, simple peripheral circuit and high accuracy of the temperature control. The error of the temperature control is ±0.1℃.

Erbium-doped waveguide amplifiers(EDWA's) pumped at 980nm wavelength are stud- ied using overlapping factors methods in this paper. An analytical implicit gain solution is de- rived, and based on it an analytical threshold expression of pump power is obtained also. Finally, effects of erbium-doped concentration and pump power on the gain of ED WA's are discussed in detail

We propose an improved method to compress optical pulse in fibers when the group- velocity of two optical pulses is mismatch. It is found that the enhanced compression of optical pulse can be obtained by combined effects of the walk-off and the initial time delay between the two pulses.

In this paper, we used the variational principle for the optical soliton-like pulses in the optical fiber and introduced the small perturbation of the third-order dispersion to the NLS equation to investigate the evolution of the parameters of the optical soliton-like pulses, and we got the conclusion and the evolution equations for the parameters of the soliton-like pulses in the optical fiber.

Properties of soliton propagation in twin-core fibers are studied numerically, including the effect of third-order dispersion. The results show that: time delay of soliton and separation of two same phase soliton versus propagation distance will linearly arise, and the two characteristics independently exist. The delay is linearly increased and separation is linearly decreased at the same time versus propagation distance if the coupling coefficient is increased.

This paper applies method of theoritically analysis to prove the equivalent model of fused fibre compose wave guide. The weakly guiding and weakly coupling approximation must be utilized when the approximate parallel waveguide model takes the place of the original model of the fused tapered wave guide. According to this analysis and the technology of the weakly fused tapered by ourself we obtain that the high grade wide band couplers with a shape of dumbbell satisfy the weakly guiding and weakly coupling conditions.

A novel method for measuring the relation between the UV-induced effective index change and the exposure time of the fiber core is presented. This method can bring a more precise measurement results compared with the Bragg wavelength drift method.