Giant pulse laser energe is absorbed uniformly by the shell of glass pellet filled with D-T gas. D-T gas is taken as the perfect gas here. la our analysis the glass shell is presumed to be devided into several layers. After absorbing the laser energy, the outermost layer explod and transfer the energy to the inner layers. The D-T sphere is heated and compressed owing to the kinetic energy of plasmas produced by the inner glass layers and the effect of thermal conductivity. The detailed analytical and computational results are in good agreement with those obtained by one dimensional two temperature Lagrange mathematical mode.

This paper deals with a new method for calculations of ray delay in waveguide fibre, and presents the calculation results for the fibre with various transverse refractive profile.

Under rational simplification, the expression for the beam quality deterioration by simultaneous random flutuations of gain and density is given.

This article introduces bnief ly the principle of sweeping away rust by laser and the test on the ship steel by CO2 laser.It is a new method that we can use to sweep away rust on the surface of steel and iron materials by laser. It not only can sweep efficiently away rust but also strengthen and harden the steel and iron surface, and preserve the surface from corrosion.

It has been proved on the basis of the formula for coherent object images that when the far field distribution of the original optical beam will be reconstructed whoa the laser beam passes through a homogeneously distributed circular aperture grating. Thus the circular aperture grating can be used as the attenuator in laser beam measurement. Experiments showed that when circular aperture grating was used as the attenuator, its error was less than 1.7%。

By using a laser cavity which consists of only two gratings and a resonant reflector, a N2-laser-pumped dye laser with a spectral linewidth of 1.3 GHz has been made. A formula of linewidth calculation based on relation of light intensity versus wavelength is presented and the calculated values are found to agree with experimental results.

Properties of a mode-locked Nd3+ phosphate glass laser with four kinds of dyes are compared. Contrast, of two photon fluorescence, pulse width, spectral properties, output energy and stability of laser operation are included. Finally, the best construction of laser cavity is discussed.

Focusing the TEA CO2 laser pulse onto a metal target in the vacuum cell, the backward jet of plasma produced by laser pulse can create electric pulse between target and cellwall. The effects of beam focusing and vacuum condition on the conversion are investigated experimentally. The maximum output voltage is 300 V when the peak power density of laser pulse is 1.4x109 W/cm2. Over-all efficiency is 0.01%. Using two separated collecting electrodes, the velocity of plasma expansion can be obtained.

Configuration, fabrication and performances of sealed-off CO2 waveguide lasers are reported, with a discharge length of 12.5 cm, the device consists of four BeO plates arranged in a square hole of 1.5 mm size, the cavity is 15 cm long. The maximum output power is 1W. At a gas pressure of 150 torr, the tuning width of p20 line was 500 MHz measured by optical heterodyne with two waveguide lasers.

Tuning properties of birefringent filters as elements for wavelength selection in flash lamp pumped dye lasers and some factors aSecting tuning performances have been studied. Suitable arrangements of crystal plates and glass plates are discussed.

The trace of visible scattering in air induced by a CW1.06m laser beam has been observed inside the cavity of a Nd: YAG laser. The scattering light has a continuous distribution covering the visible spectral range, and the threshold of laser beam power density required for this effect was found. When the period of laser action was reduced to the order of millisecond by using a mechanical rotating switch within the cavity, this effect could still be observed.

In principle Q-switching techniques can be devided into two kinds: pulse reflective mode operation (PBM) and Transmission mode operation (PTM)), which govern the photon lifetime in a resonator. Here PTM Q-switching technique is taken as an example and the experimental results are given. A proposal is made for achieving a minimum laser pulse widthby the use of double-ended open resonator.

Porous metal coating sintered at high temperature with 100~360 mesh bronze powder has been studied experimentally. This coating exhibits as a nearly perfect difEuser for the 10.6m wavelength of CO2 laser; its melting point is up to 1000, the highest of the known sphere coatings; it has stable physical and chemical properties; good mechanical and heat transfer characteristics; and can be used in a low pressure system.

In this paper high-quality anti-reflective coatings of ZnSe-BaF2,ZnS-BaF2 and As2S3-BaF2 on Gallium Arsenide (GaAs) surface are described. They are characterized by an ability to withstand CW CO2 laser power up to 1000W/cm2 and a transmissivity of approximetly 98% at CO2 laser wavelength. The damage problem of the thin films on the sureface of windows, lenses etc. for a CW CO2 laser device has been solved and the output power of the device enhanced, thus creating condition for application and development of CO2 laser systems.