A detailed discussion on the SHG is given for the materials with absorption loss and amplification gain. Using approximation method, the analytical solution is obtained and compared with the numerical calcalation of the coupling equations.

We have deduced the motion equation for Stokes parameters which describe the polarization state of a light wave as it propagates in an active medium. The method to determine characteristic vectors indicating the specific anisotropie properties of the medium is also proposed.

The experimental results of several kinds of high repetition rate Rholamine dyes pumped by a CuCl laser are presented. The laser radiation covers about 600 A. ranging from 5630 A to 6320 A. The maximum conversion efficiency is up to 33%.

On the basis of rate equations, numerical experiments on the dynamic process of the photon density spectrum evolution in eletro-optically tuned ruby lasers with dye Q-switching have been carried out. The effect of dye Q-switching and resonant frequency selector (RFS) on wavelength char ctcri sties is analysed and the dye switch plays an specially important role in mode selection and line width narrowing.

On the basis of gain coefficient calculation it is shown that the frequency of the CO laser can not be continuously tuned over 5~8m region by means of increasing its pressure bacause of the resonant absorption of the B and P branches.

The FA(III)centers have been obtained by X-ray irradiation and light conversion in T1+:KC1 single crystals, its emmission band and excitation band lies from 1.3 to 1.7m and 0.9 to 1.2m with peaks at 1.5m and 1m respectively (77K). The light and thermal stability (R.T)of FA(III)centers decreases slowly in the first few days, and then remains unchanged, the stable FA(III)centers can be finally obtained.

A new method for measuring high reflectivity and transmissivity is given, with which the effect of both fluctuation of light source and nonlinearity of the detecting system on the accuracy of measurement can be cancelled out. The repeatability is better than 1x10-4 at 632.8 nm and 5x10-4 at 1.15m respectively.

This paper describes a new method for real-time measurement of lasing spectrum of semiconductor lasers(ES method for short). It is useful particularly for studying characteristics of longitudinal modes and thermal and aging properties of semiconductor lasers.

The principle, testing apparatus, test piece preparation, experimemtal method tooth results are reported, by using laser speckle interferometry for measurement of human and elastic modulus, the issues encountered and the measures taken to improve the measurement accuracy are digcsnsed.

Transmission images of mosquitos and microballoons have been taken with X-rays emitted rrom laser-produced plasmas as light sources, the photon energy of X-ray beiug in the range of 1-2 keV. These images are very distinct, the image resolution comes nearly to 1 micron, limited only by the recording plate itself.

An one-step rainbow holographic process using a Fresnel lens as imaging lens is presented. A bright and sharp reconstructed image is obtained. As compared with the conventional one-step rainbow holography, this technique offers the advantage of wide field of view.

Tunable characteristics and conversion efficiency of synthesized a-NND laserdye is reported.

Raman conversion eflBeiency of DMCO solution under the action of picosecond pulses of various pumping intensities is measured. Preliminary explanation on saturation characteristics and thereshold are given.

This paper studios on the formation of electronically excited radical C2 d3 11a on pure Freon 22 under irradiation of a TEA CO2 laser. Six bands of Swan system have been observed.

TEM00 output of CW Nd3+: YAG laser at 1.32m have been obtained. The output power and orientation of TEM00 and multi-mode beams were measured. The laser was then tuned to 6 different transitions of 1.3188, 1.320, 1.3338, 1.3382, 1.3350, 1.3564m by means of intracavity etalons,and the output power were measured, respectively.

The principle of a flight of stairs charged power supply, of which voltage can be contiuously adjusted, is described. The features of the circuit are analysed. This power supply has the advantages of voltage adjustability over wide range, simplicity and higher efficiency.

This paper reports the double resonance optogalvanic effect in neon. The first step is 3s3p transition, and followed by that from 3p state to a higher one. The signal of such optogalvanic effect is greatly enhanced by up to two orders of magnitude with respect to the signal produced by the second step alone. Therefore., the method can be used to detect more optogalvanic signals.