Starting from the well-known rate equations, population accumulation and loss process during a period of time for a pulse train laser are analysed and a population equation describing pulse train laser is formulatel As a consequence, analytical expressions of its performance parameters such as output energy, peak power, pulse width and delay time can be derived from the period of time tT and effective pumping rate B as variables.

In this paper, some plasma properties of Ar-Kr-F2 gas mixtures are calculated and discussed under the condition of steady discharge.

A proposal is presented for cooling gas atoms through optical frequency shifts produced under the illumination of laser light.

By acousto-optie AM modulation, actively mode-locking experiment on argon ion laser have been performed. Ultra-short pulse trains have been observed with a measured pulse width of 800 ps and a repetition frequency of 103 MHz. The influences of modulation depth and tuning out have been measured. The experimental results and the thoretical calculations are in good agreement.

UV-preionzed ArF and KrF excimer lasers are reported. Maximum pulse energies of 105 mJ in ArF and 185 mJ in KrF were extracted. In this paper we discuss the effect of various parameters on laser performances.

Temperature distribution and thermal flow direction of the laser crystal rod of anisotropic thermal conductivity was studied. Elliptical isothermal contours and thermal energy of non-radial flow were obtained. It is pointed out that the transverse thermal conductivity is isotropic on a certain direction of laser rod. A simple model was used to analyse the phenomenon of thermally induced birefringence of YAlO3 laser crystal rod. Interference pattern of cross polarization for c-axis YAlO3are two sets of hyperbolas, and for b-axis YA1O3 ellipse. The observed results can be explained satisfactorily by theory.

The moire transformation was analysed using communication theory. Based on it, we proposed two new types of phase measurement. The first is a carrier interferometer. It has various applications and advantages, for example, automatic compensation, multiplex recording, shearing of a wavefront, relative compensation of the phase variation in dynamic texts, harmonic interference, etc. The second is a coded mask photographic interferometer using white light. It can be used for measuring strongly varied phase objects.

A simple method for determining absolute sensitivity of phototube is described.

An experiment on laser speckle diffraction and measurement of speckle intensity has been conducted. The results show that the Fraunhofer diffraction pattern or quasi-Fraunhofer diffraction pattern of the measurement aperture may be observed, when the raito of the average speckle diameter to the aperture diameter is equal to or larger than one, dr/d0>1. When dr/d0>>1, the negative exponential probability density function of speckle may be obtained, and the speckle contrast may be used to characterize the scattering surface roughness.

The development of F-like center lasers and their potential applications are reviewed in this paper.

Single spectral lines at 1.064, 1.073, 1.061 and 1.052m wore obtained respectively by inserting into the cavity the uncoated(or coated)solid etalons of 0.1 mm or both 0.1 mm and 0.14 mm thickness and appropriately controlling the gain of Nd:YAG laser and tilted angles of the etalons.

A TEA CO2 laser with air as gas source is reported. Its parameters are comparable to those obtained with industrial CO2 and N2 as gas source. A description is given of the structure and the features of the gas generator and the experimental results.

Characteristics observed both in selective corrosion and selective growth of GaAs crystals are reported.

A glass directly sealed with tungsten at high temperatures is introduced. A brief description of the glass composition, performances and mechanism for sealing with tungsten is given.

This paper presents the principle, method and experimental results in developing differential filter and image differential processing by means of optical transformation technique and coherent optical correlation method, and offers our considerations of stroke-classification of Chinese characters and picking up Chinese characters to be realized by optical partial differential and optical image correlation technique.

A mechanical instrument of high reposition accuracy is reported. It has simple structure and can be made easily. The accuracy of reposition is up to the order of a few microns. It is an efficient tool for optical information processing in the reposition of complex spatial filters.

A feedback-controlled current stabilized power supply for CO2 wave-guide lasers is reported. Current is stabilized in the range of 2~4 mW, the unstability of the current is lass than 1 % with respect to 20% fluctuation of network voltage.