The Parameter relationship between an injection Fabry-Perot cavity and its output beam was calculated for several typical cases, the spectral characters and time relaxation effects of the cavity were investigated, and the potential applications of these properties in laser spectroscopy were indicated.

The characteristics of quantum spectrum of the transition radiation produced when high energy relativistic electrons passing through a foil stack,the mechanism for producing transition radiation and the principal unfavourable factors which affect the enhancement of intensity of transition radiation are analysed, and a new method is put forward on the analysis to increase the intensity of transition radiation based .

bome careful researches have been made on the dissolution processes of KTP crystals in phosphate fluxes, and their variations in the solubility and substability regions for crystal growth. Compared with the results of phosphate composition analysis, the varying rules shown in various processes, and the dependence of various factors on each other have been further studied. Different phosphate fluxes and their composition effects on KTP crystal growth habit have also been discussed.

PR-1 laser power ratiometer system is reported which is based on a cavity pyroelectric detector and a silicon photodiode, and the overall structure and the circuitry design of the instrument are described.

JM-80 large aperture laser energy meter has been developed. Automatic thermal balance compensation technique is adopted and the restoring zero time has been reduced from 15 minutes to less than one minute,Digital readout is used for energy display and peak value is kept. With electrical heating calibration, absolute measurement accuracy is better than 5%.

Starting from a speckle model of the scattering object and giving consideration to etatistical nature of speckle phenomena, the recording process of specklegrams with monochromatic incoherent light and white light illuminating is discussed.The relationship between monochromatic light speckle and white light speckle is explored .Quantitative description is given for the effect of he frequency content of the scattering object and the photographic aperture on the spatial frequency of specklegrams.Theoretical analysis and experimental demonstration are also presented.

Uniqueness of equivalent confocal resonator method is discussed. Demonstration of the uniqueness for tne cases it holds has been improved by using the quasigeometric theory of optical resonators and the characters of the equivalent symmetric confocal resonator.

We studied analytically and numerrically the stability of the stationary detuned modes with Gaussian transverse profile in a ring cavity containing homogeneously broadened two-level atoms. Using the mean-field and good cavity approximations, we found out unstable domain.In OBS case, we obtained conditions of optical biatability and a quadratic equation which is satisfied by the eigenvalues.

This paper demonstrates for the first time the feasibility of an electrically initiated pulsed oxygen-iodine laser which can be initiated efficiently by low energy electrons. An O2(1)-CH3I-N2 mixture has been made to lase by electrical initiation with an output energy of 130mJ. The electrical efficiency is 350 times higher than that obtained with photo-initiation.

Bremstrahlung from anode of thick targets was measured to determine the 3-beam movement and distribution in our Raman free-electron laser. The principle of the method and the measurement results of electron distribution in the diode and drift tube of the Raman free electron laser are presented. The experimental results are in accordance with the theoretical predition.

A para-H2 stimulated Raman laser pumped by a TEA CO2 laser was developed. The principal factors affecting Raman conversion efficiency were discussed. When the laser ran at about 100K, the maximum output energy of the Stokes wave at 16m was 536mJ, corresponding to an energy conversion of 13% and a quantum conversion of over 20%.

Lassr pulse chirping has been observed experimentally in our CPM laser. Using intracavity compensation by a prism-pair consisted of two prisms, effect of group velocity dispersion of the prism-pair on duration, stability and spectral characters of laser pulses is studied experimentally.

This paper experimentally shows that (1) the intensity evolution of green (510.6 nm) and yellow (578.2 nm) pulses of a copper vapor laser oscillator from lasing to steady operation, (2) the effect of switching delay time in an oscillator/amplifier system on the amplitudes and the relative delay between both pulses. It is demonstrated that for a B6G-dye laser, the conversion efficiency not only depends on the intensity ratio, but also on the relative delay of the green and yellow pulses.

Starting from general reservoir theory for the atomic-field density operator, the expression for the photon distribution in single-mode laser light is determined by taking account of the influence of both linear and nonlinear gains.

Coherent radiation at 330.22/330.30nm is observed respectively as pulsed laser light at 574.42/574.53nm is focused into a heat pipe oven containing sodium vapor. It is concluded that this process is a four-wave mixing process of atomic sodium. The theoretical wavelength is found to be in agreement -with experimental result.

A new method using high-frequency induction heating has been developed for sealing the glass envelope and mirrors of He-Ne lasers. The lifetime of the lasers manufactured fay this technique are over 30000 hours.

It was found experimentally that the resonant energy transfer and Penning process have relatively larger reaction cros ssections in HgBr + N2 and HgX2(X = Cl, Br, l)+Ar mixtures respectively. The stimulated cross sections, saturation intensities and oscillation thresholds of these transitions were calculated from experimental data. The possibility for CW operation of HgX2/HgX(B-X)lasers is also discussed.

The fluorescence spectrum bandwidth, energy level position and low symmetry level splitting of Ni2+:BeAl3O4 laser crystal were measured at temperature range of 10 to 300 K with laser induced fluorescence method. Some suitable relations were adapted to describe the temperature dependence of these parameters.