An equivalen feresonator has been proposed. By adopting the ABCD law, we are able to establish an expression, which represents the relation between the optical beam parameters and the transmission ray-transfer matrix of the equivalent resonator. In comparison with the self-consistent method of ray-transfer matrix, it reduces (N-2) second-order matrices, thus simplifying the calculation process, and the validity of calculation results are also checked.

Both X-ray preionization and e-beam preionization are investigated for avalanche-discharge excimer lasers by studying the number density of preionized electrons, the characteristics of the laser energy output and the discharge.

Directional ratio of about thirty has been obtained in a ring resonator with an additional mirror. The linewidth is compressed by ten times as compared with that of the stationary resonator without decrease of output power. A new opinion is put forword for the time characterestics of oscillation.

By measuring the discontinuous oscillation components of the continuous frequency spectrum for the beam noise of He-Cd lasers, it has been discovered that the boundary conditions of the laser tube, the discharge current and Cd atom density have influences on the frequency and the power output of the characteristic peak of the ionization wave frequency, the de’pth of modulation, the 1/f noise bandwidth and other noise amplitudes. A 100% depth of modulation at that characteristic peak has been obtained.

Conditions for amplifying the light radiation by relativistic electrons in the interaction between the light and electrons have been analyzed. It is shown that only when the phase relation and the frequency relation are satisfied, the inoidient relation would have higher net gain.

In this paper, it is indicated that laser forward scattering pattern can also be used to insure good oentricity of silicone resin coated silica optical fibers. The generation and change of the pattern are explained by ray-optics principle. The feasibility of actual application of laser forward scattering pattern during the drawing-coating process is confirmed.

Speckles generated by a white light laser are different from those by conventional monochromatic lasers. It is pointed out that the white light laser has its advantages when speckle technique is used. By measuring the displacement of a transparent object doped with scattering particles, we can observe not only the distinct interference pattern of speckles, but also make a quantitative analysis on the deformation of each section within the three dimensional transparent objects.

In this paper, observation results of the scanning election microscope on laser materials and components (including glasses, crystals, films, semiconductor lasers etc) are summarized. Other possible usages of the scanning electron microscope in laser research are also discussed.

A new reversible colour-change system composed of a chlorine-containing polymer and dimethyl yellow dye is reported and this colour-change mechanism is discussed. Upon exposure to UV radiation the polymer is decomposed and releases HC1 which reacts further with the dye to induce a colour-change from yellow to red. When irradiated with Ar+ laser, an inverse colour-change occurs presumably from the heating action of the laser.

A new pyroelectric laser power meter is introduced. It has fast time response (<1 sec), high sensitivity (18mV/W) and flat spectral response from the range of UV to IB (190.0 nm-25 μm).

In this paper we report the three- dimensional superradiance of the dye laser obtained by using the second harmonics from a giant pulsed YAP: Nd3+ laser oscillator-amplifier to pump "dye ball" Rhodamine 6G.

Using the deformed triangular profile model, the calculation formula of the defects depth are derived. The factors that influence the calculation accuracy are analysed, and the expression for the minimum loading pressure is given. Calculation results for determination of internal depth of the plane tire show that the theory agrees with the experiments.

Stimulated Raman scattering of picosecond pulses in methanol is investigated. Mode competition between 2837 cm-1 and 2942 cm-1 in methanol is discovered when excited with pulses of various durations.

It is reported that prostate hyperplasia can be successfully treated by CO2 laser evaporation and 34 clinical cases have been analysed. The method has the advantages of high effectiveness, reliability, safety and the operation is very simple. More important point lies in the possibility of operations for the aged and weak patients and also for the amalgamated patients suffering form heart, lungs, kidney diseases.