An experimental study demonstractes that there is a strong uncertainty of the 10.6μm laser extinction by atmospheric aerosol in relation to the same value of visibility or aerosol concentration. However, the data seem to indicate that there is a certain correlation between 10.6μm laser extinction by atmospheric aerosol and visibility from the statistical point of view. For such a correlation an approximate expression is given here, and the possible applications in laser engineering are discussed.

According to the point of view that the transmissive hologram can be reconstructed by reflection, the analyses of transmission imaging and reflection imaging are both presented. We postulated a model of lens-mirror composition for the ±1 order images of a holcgraphie lens. By using the method of Fourier optics, authors obtained the expressions for the point spread function and the transfer function of a holographic lens with arbitrary aperture. From this the limited resolution and the cut-off frequency may be derived. The iahomogeneity of the colour blur of image is also discussed.

This paper points out: (1) One can evaluate a possible range of coma aberration quantities according to the dissymmetry in star patterns; (2) The maximum sensitivity of coma aberration evaluation is about λ/25; (3) It is difficult to determine exactly an geometrical value of coma aberration by method of star-testing.

In this paper CW diffusion chemical lasers with two energy levels are described by kinetic model. The results of the kinetic model in consideration of both inhomogenoous broadening and homogeneous broadening are given and compared with rate model. The discussion is focused on the effects of inhomogeneous broadening. The specific formulas used for the calculation of the characteristic of oscillator are given. In case of certain G, and limited chemical pumping rate K, the intensity, power output and chemical efficiency of CW chemical lasers are exactly solved.

Influences of the optical homogeneity of ruby laser on laser output energy are analysed in this paper. High energy experiment with the ruby laser has been conducted, and 1500 J* of laser energy has been obtained. Having resolved the problem of efficiency drop, 3000 J** laser energy has been reached.

Recombination rates for processes Xe+ +Cl→ + M- XeCl* +M (M = He, Ne or Ar) have been calculated. It has been found that the recombination rates in buffer rare-gases He, Ne, Ar at 300K reach the maximums of 3.3cm3see-1, 2.5cm3sec-1, 2.4om3sec-1, at pressures of 17 atm, 6.5 atm, 2 atm respectively. In addition, the recombination rates drastically decrease with increasing gas temperature at fixed gas density.

In this paper, the stresses and photoelastic effects are calculated in GaAs-GaAIAs multilayer wafers with masked and selective thermal oxidation structure. Authors also propose a new method of Lloyd s mirror interference in a medium for determing directly the refractive index variations caused by the photoelastic effect. The estimated values of index variation from our experiments agree with the theoretical ones within an order of magnitude. The above study would be valuable in the field of semiconductor lasers and integrated optics.

Based on the combination of theory and practice, this paper discusses the formation of refractive index gradient in optical glass and related questions of optical quality in the production processes.

When a optical probo-beam is scattered by a plasma with high temperature and density, it is easy to separate the ion component from the electron conponent of the scattering spectrum. Thus, the plasma temperature distribution can be measured. Besides, the plasma electron density distribution has been measured using a interferometer. The results show significant effects of the radiative ponderomotive force.

Basing on the Fermi statistical distribution of electron and hole in semiconductor silicon, the dependence of the transmittance of silicon under CO2 laser irradiation on temperature has been calculated, furthermore theoretical results were proved by experimental data. It has been shown that silicon can strongly absorb energy of the beam under intense CO2 laser irradiation, the mechanism of the absorption is dominately absorption of the free carrier.

Suppose a optical spot is of a Gaussian intensity distribution and is modulated by a sectored reticle, then the parameters of this optical spot can be exactly derived from measurements of the harmonic amplitude spectrum.

This paper reports the phase orthogonality both theoreitically and experimentally in POLINEX spectroscopy with a modulated polarization and a fixed polarization of two linearly polarized optical beams. It is possible to make the phase of the Doppler-free signal orthogonal to that of the Doppler-broadened background, if the fixed polarizer is properly adjusted.

In this paper, the experiment of optoacoustic detection of stark spectroscopy for CH3C1 and CH3F molecules is described. This method has been compared with conventional optoeleotric detection. An optoacoustic signal is produced when a laser line coincides with a molecular absorption line which has been shifted by making use of stark effect, and is detected by a special microphone. The dependence of optoacoustic signals on sample gas pressure has been determined and derivative signals of a number of line components of CH3F molecule under the condition of 11500 V cm stark field and 150 mTorr pressure have been recorded. The experiment indicates that fche optoacoustic signal decreases rapidly when the pressure is reduced in order to apply high stark tield to the sample gas,and it limits to obtain higher stark field. Authors have discovered that under similar conditions the optoelectric detection has higher sensitivity and higher signal-noise ratio than optoacoustic detection. And yet the optoacoustic detection method may be improved undoubtedly by putting the laser closer to the microphone using higher laser power till the absorption saturated^ and reducing the gap between two stark electrodes.

This paper reports the investigation of laser-induced optogalvanic effects and spectra of six samples CH3Cl, CH3OH, C2H3OH, C2H3C1, C2H4 and NH3. Intense optogalvanic effects have been observed. The actions of the V-I characteristics and discharge relaxations of discharge tubes on the optagalvanic effects are investigated. The mechanisms of the effects are discussed tentatively. The results show that laser-induced optogalvanic infrared spectroscopy can be used as means of analysis for gases or vapors with high spectral resolution.

In this paper, theo ptical spectrum of several new infrared ultrafast saturable absorption dyes, the measurement of their relaxation time in picosecond region are mainlly described and the experimental technology are discussed. The time resolution of the setup has been determined being shorter than 1 ps by the autocorrelation measurement. The measured absorption recovery time of four kinds of the dyes are form 5 to 9 ps. Their optochemical stability is much better than Kodak 9860.

Using a specially designed heat-pipe oven, the 5S1/2-6S1/2 stimulated electronic Eaman scattering (SERS) and some relative amplified spontaneous emission (ASE) have been observed in superheated Rb vapour. The experimental results reveal that ASE processes have some new characteristics and have dramatic influence on the tuning profiles of the SERS signal.