The chemical reaction of Au and P-type (111) oriented silicon on the surface induced by an acousto-optic Q-switched frequency doubling laser is reported. The samples were analyzed by X-ray diffraction, X-ray photo-electron spectroscopy (XPS), metallurgical microscope, scanning electron microscope (SEM) and four-point probe resistivity measurements. X-ray analysis generally showed the coexistence of non-uniform multiphase au-silicidea since their composition yaryed with depth, i. e., there is a "transition region". This demonstrated that the reaction took place preferentially at the interface between gold and silicon. It is well known that the Au-Si phase diagram has a lowest en tec tic point of 370 ℃ which was determined by extrapolation of the two branches o± the liquidus curve and therefore is rather uncertain. Thus, the gold-silicon reaction produced Au-silicides rather than Au-Si mixture. In this case heating and cooling rates achieved by the scanning beam are of primary importanco.

In this parer, a method of reducing noise in the image by sampling in the spatial frequency plane is discussed. The results of calculations and experiments show that the method can suppress noise without sacrificing the resolution of the system. The method is used in the SAR optical precessing system and the experimental results are given.

The behavior of the optically pumped laser in formie acid vapor at 393, 418, 432 and 513 μm has been studied and the wavelengths were measured by means of Si scanning Fabry-Perot interferometer. The precision was up to 0.4%. The behavior of multi-wavelengths laser of the formic acid-methanol vapor at 118.8, 418, 432 and 513μm has been studied. No significant effect of esterificated aciton of formic acid-methanol on output of the laser has been found under the condition of the experiment.

In this paper, the mechanism of deep self-modulation 4416 A output in He-Cd laser at ion-wave characteristic frequency is roughly discussed. The output of self-modulation is produced through penning collision because the moving striation causes the fluctuation of metastable He atom density. Deep modulation means strong initial disturbance at the positive column near the anode, but there is no considerable amplification factor along the tube axis.

The effects of the pump pulse width etc. of a sinusoidal pumping on the passively mode-locked lasers are given. The idea of "the mode-locked operation bands" is presented. The overall effects of various operating parameters and the relations among the parameters in the mode-locked process are pointed out theoretically. According to the parameter-selection rule given, the tine train of mode-locked pulses have been obtained.

A new method, "self-guiding method", for ruling long diffraction gratings is advanced in this paper. The key point of this method is that the grating being ruled plays a role as a datum grating to lead a photoelectric controlled ruling engine to continue its ruling. The two main parts of this method, i.e. precision analysis and experiment devices are described in details. We have ruled several self-guiding samples of grating with one switch. The spectrum quality of them is as good as a general one, the actual resolution power of them with 50 mm width is about 90% of the theoretical value. If the traval of the engine is long enough^ a very long diffraction grating can be ruled by this method.

The optical distortion on water-cooled laser mirror surface under the action of a high-power CW laser beam has been discussed. The deformation equations of laser mirrors are deduced and an analytic solution is obtained. The definition of distortion quality factors for mirror material are also given. The theory is in good agreement with our experimental results.

In this paper the problem of quantitative analysis of the knif-edge test is studied. Taking the Linfoot s integral function as theoretical base, two methods for finding out the error function are derived. As an example, a precision spherical mirror is experimentally tested and the error curve is calculated. The amount of imperfection of the mirror is found to be 0.046λ, that is very close to the estimated value by the optician who makes it.

A method for the secondary spectrum correction by using intrinsic chromatic aberation[1,2] is described. It is possible that not only the secondary spectrum is corrected by using usual glasses, but also the effect of the environmental temperature and pressure on the image shift of the optical system can be reduced.

In this paper, the field distributions of the linearly polarized modes EH1m and LPnm(n≥1) are discussed in the large radius hollow dielectric waveguides. The latter is certainly linear combinations of the degenerate waveguide modes. Then the coupling coefficients are between the free-space Gaussian-Laguerre modes and these linearly polarized waveguide modes. The results agree well with published experimental data. We also discussed the influences of input coupling hole with less diameter on output power of the optically pumped FIR laser.

The inversion of low resolution infrared scanning equations for a cylindrically symmetrical combustion gas flow is investigated with CO2 (4.3?m) as emitting and absorbing medium. The Lorentz line random band model, exponential-tailed S-1 line trength distribution function and Curtis-Godson approximation are used to express the ransmissivity. An iterative solution of the radiation transfer equation for the temperature profile is established assuming a known absorbing gas concentration distribution. Numerical experiments show ihe iteration is simple and converges quickly with a high calculation accuracy. The temperature solution is stable 1o the intensity. Analyses show the influence of intensity error on temperature solution could be expected weaker, if the temperature is lower and the wavenumber used is largeAn approximate formular to calculate the absorbing gas concentration profile from the radiation transfer equation and the transroissivity equation Is derived. The inversion of the active infrared scanning equations is formed by combining the concentration formulae and the temperature iteration. Numerical experiments show the inversion is simple and accurate enough for the temperature measurement in engineering applications.

Principle and arrangment for real-time display of in-plance vibration by speckle method with the aid of liquid-crystal valve is presented. White light is used as the writing beam and He-Ne laser as the reading beam. The preliminary experimental results are given. The amplitude calculated from the real-time displayed Bessel fringes is in good agreement with the actual one.

Two simple calculation methods, i. e. analysis and extrapolation methods, for determining film refractive index of the optical slab waveguides have been presented in this paper. When the film thickness and substrate index are unknowen, these methods can be used to determine film index accurately using the simple four fundamental operations of arithmetic based on linear dependence of the film index upon mode indices.

This paper describes and analyses the imaging performance of high speed raster photography with two dimensional pulse functional array. The lenticular plate has been used in the optical system to get the point-array-image of the raster plate which corresponds to the object. The density distribution of the point-array-image was measured. The resolution of the raster image is relative to the pitch of the raster plate. The high speed raster photography can obtain the higher relative brightness and lower resolution of image as compared with the conventional high speed photography. The frame interval is equal to the size of the image point. For conventional high speed photography^ a frame inteTyal must be larger than the height of frame. So "that raster photography can reach high framing rate. By reducing the frame size of ihe raster image, one can increase the resolution of the image.

Various performances of the two-prism beam expanding system in dye laser resonator are studied. The system possesses not only good beam expansion and collimation for the laser beam, but also good filtering and tunning functions. The angular dispersion formula of the two-prism beam expanding is derived and proved in theory, by using a tunning resonator composed of such a system without etalon, the narrowband tunning laser output with bandwidth ~GHz (~0.001 nm) can be achieved. The laser output bandwidth <4 GHz is experimentally obtained. The theoretical basis (angtilar dispersion formula of a multiprisms system) for getting <1 GHz narrowband laser is given too. In addition, advantages of the double(mixlti) prisms system-small reflection loss, polarization operation, easy adjust are analyzed. It indicates that two(multi)prisms beam expanding system is on ideal optic component with multifunctions (expanding, filtering and tunning).

A satisfactory right angle scattering geometry has been found to determine the directional dispersion of extraordinary phonons in LiTaO3 crystal. Ten specimens with different orientations were prepared and the surfaces of which were coated with antirenecting film to eliminated the additional scattering due to the internal reflection. A series of ordinary phonon and extraordinary phonon Raman spectra with different angle between the wave vectors and optical axis have been obtained. Four A1 and nine E optical phonons are assigned and thirteen directional dispersion branches are determined. Since all the peaks of extraordinary phonons could be observed simultaneously in same Raman spectra of extraordinary phonons, the directional dispersion branches could been determined without any ambiguity. The experimental results of the directional dispersion of the extraordinary phonons are in accord with the theoretical aesults calculated by the formula for uniaxial crystal.