Lasers with side- polished laser rods can reduce thermal-optical distortions becausethey have a special kind of resonators-the ones with side reflectors. In this paper the analyticsolutions to the eigenmodes of the resonators are obtained by means of series of a waveguidemodes.

This article discusses superradiance by means of equations for interaction of radiation with matters. The output waveform of the single-pulse superradiance has been found, and its fundamental characteristics and producing conditions are analysed. Eesults obtained agree to those of other theories, but this simplifies the mathematical processes.

A N2 laser with λ=337.1 nm, pulse width =700ps is used as pumping source. ASE pulses with a duration of 45, 55 and 45 ps from solutions of Rh6G, Rh B and C311 have been obtained respectively by transversal travelling wave pumping arrangement.

A compact, low input power optical bistable device, combined with photodetector and optical fiber directional coupler and semiconductor laser diode, was presented. The principle is described graphically to explain the observed effects such as hysteresis, differential operational gain and memory functions.

The laser-evaporated atomic vapor was studied experimentally with a view to obtain an atomic beam. The signals of multiphoton ionization of refratory metal atoms obtained with the pulsed atomic beam were observed and their detection was discussed.

The swirling flow effect on the mass flow rate of convergent nozzle is analysed. Under certain parameters, the flow rate of swirling flow could be reduced to one tenth of that withoutswirl. If this principle is employed possible advantages may be obtained: (1) pumping power could be substontially reduced, (2) the window lengtq could be shortened.

In growing alexandrite crystals, a novel inclusion has been found. The inclusions are quantitatively analysed by electronic probe and the mechanism for forming inclusions is suggested. In our Bridgman MgF2 crystals, the inclusions in direction have also been observed.

This paper deals with the influence of laser beam on the width and depth of melting zona and surface smoothness. The experimental result shows that the depth of hardened zone and smoothness of surface can be controlled conveniently by varying the power output beam diameter and scanning rate of laser light. By means of shielding gases, porosity can be reduced greatly. Proper selection of materials, preheating and postheating can help to avoid cracking.

Both calculation and experimental results show that second harmonics of all spectral lines of Ar+ laser light can be produced simply by angular tuning ofβ-BaB2O4 crystal at room temperatures. This is used in the autocorrelation measurement of mode-locked Ar+ laser pulses, and the Ar+ laser pluse, with 4 stronger sp’ectral lines were measured to be180-230 ps at room temperature, overcoming the shortcoming of the previous SHG method at low temperatures and cross-correlation method.

A new laser dye for blue-green spectral region was synthesized and its spectral and laser properties were given. It was found that different solvents can make laser wavelength of this dye tuning in the spectral region of 457 to 521 nm. It has high efficiency and good photochemical stability.

Ocular dose reponse relationship was experimentally determined by exposing chinchilla rabbit eyes to XeCl excimer laser light at 308 nm. The eorneal damage threshold ED59 (effective dose for 0.5 probability of producing a biomieroscopically visible eorneal lesion) was found to be 0.83 J/cm2(95% C. L. was 0.749-0.911 J/cm2).

When the pressed scattering medium layers and organism layers is irradiated by He-Ne laser light, the original opaque can be changed into transparency or its transparency increa-sed. Press irradiation experiments with foam plastic, cotton, animal, human body were made resulting in similar phenomena. The space distribution model of laser propagation in strong scattering medium is put forward and theoretical analysis for press irradiation is made.

The paper describes the operating principle of the YAG laser marker, optical, deflectors, the performances of optical system, micro-computer and the system.

This paper reports the characteristics of nonresonant photoelectric signal in aglow discharge tube with a cathode irratiated by CW CO laser beam. It is indicated that the cause of the nonresonant photoelectric effect is the photoelectric emission on the surface of cathode at high temperatures and amplified by the gas discharge.