The GGG and GSGG crystal species are excellent crystals used in LD-pumped lasers. In this article, the performance, growth and application of GGG and GSGG family were reviewed, and it was indicated that they can be used widely in the high-power LD-pumped lasers in the future.

Organic white light-emitting diode is one of the important prototype devices of full-color display. As a type of super-thin lighting, it can be applied in back-lighting of LCD and various flat-panel displays. This paper presents the progress of organic white light-emitting diodes studying in terms of light-emitting zone, device structure, and material selection.

The principle of frequency spectrum approach reconstruction technique (FSAR.T) is presented. Its formula has been also derived from simultaneous algebraic reconstruction technique (SART). This indicates the equivalence of two algorithms. Numerical simulations are made. The results show that the new algorithm is reliable. Their characteristics are discussed, and their application fields are pointed out.

In this paper, environmental scanning electron microscopy (ESEM) and synchrotron radiation white beam X-ray topography (SRWBT) are applied to study the topography and growth defects in Nd:YVO4 laser crystal. The ESEM topographic images of crack surface and the SRWBT topographic images of crystal defects are obtained, through which defects such as dislocations and inclusions are observed, which are useful for growing high-quality laser crystal Nd:YVO4 by the pulling method.

The principle of differential optical absorption spectroscopy (DOAS) for measuring concentration of air pollutants was presented. The measuring spectra pretreatment and the convolution method for measuring concentration of air pollutants also were described. Comparing with other methods, this method can highly improve the precision of measuring results.

From the optical Bloch equations, the force on the atom interacting with a standing-wave laser field is calculated. Then, the solution of second harmonics for the longitudinal light force and gradient light force is obtained. It is shown that the second harmonics for the longitudinal light force and gradient light force play important role for strong laser intensity.

The time evolution of light squeezing in the system of two-mode squeezed vacuum field interacting with a two-level atom in generalized Kerr-medium are studied by means of quantum theory. The influences of coupling constant and the nonlinear order m are discussed emphatically.

In this paper,the bunching and antibunching effects of the photon in the interaction of a cascade three-level atom with strong coherent field of initial state are studied by numerical calculation . The results show that, the antibnnching effect of the radiative photons is displayed mainly;with the increasing of the value of n, the nonlinear coupling between the field and atom is getting stronger and stronger, and the phenomenon of the revival shrink appear repeatedly.

In this paper, the general nonlinear propagation equations of four-lightwaves in bire-fringent fibers are deduced. The characteristic of polarization mode dispersion (PMD) in 4×10 Gb/s DWDM system in dispersion-flattened fibers is studied. Our results show that PMD exerts a detrimental influence on 4 × 10 Gb/s DWDM system in limiting transmission rate and the channel numbers.

The propagation properties of optical Gaussian shaped pulses is investigated in the fibers with slowly decreasing dispersion by means of variational method, and the evolution equations for the parameters of the optical Gaussian shaped pulses is derived. By these equations, we discussed the properties of the parameters.

The Higdon absorbing boundary condition and it's complementary operators (HCOM) is used with beam propagation method (BPM). It is found that HCOM is a good method and can effectly annihilate reflections arising from the computational boundary when HCOM is used for the Gauss pulse propagates in freedom space and waveguide.

The optical signals in the fiber optic gas sensor based on the opening cell are analyzed with the view of system. The criterion for designing the cell is put forward, i. e. the output property of the cell is equivalent to the White type cell under the case of no overlapping between the two nearest complex light beams on the mirror from which the cell cavity is made. A spike filter and a phase sensitive detector are utilized in the signal processing, in order that the logarithm value on the absolute voltage from the sensor system of the gas is measured. Thus, the gas sensor can be calibrated on the basis of the Lambert law. The cell can be used to measure atmospheric extinction coefficient at single wavelength.

In this paper, the nonlinear absorption of lightwave transmitting an multi-quantum-well electroabsorption modulator is demonstrated. Impact of MQW EA driving condition on the characteristics of modulated optical pulse is analyzed both in time and frequency domain. Numerical computation proves that by optimizing the driving condition of MQW EAM, nearly transform limited optical pulse with shape close to Gaussian profile can be obtained.

The correlation function theory for ferroelectrics is employed to discuss the switching current and the ratio of domain inverted area to film area during domain inversion of a ferroelectric thin film. The theory is fitted to the KNOs experimental data. Fitting results indicate that theory taking into account the thickness of the ferroelectric thin film is better than the KA model.

In lidar measurements of ozone in lower stratosphere, the phenomena of photon overlap are found when PMT receives the stronger signals from lower altitude. Data processing and analyses show that photon overlap effect greatly on lower stratospheric ozone measurements. To avoid the phenomena of photon overlap, many measures such as neutral optical attenuator, gate witch and reducing the gain of PMT, are taken to enhance accuracy of ozone measurements