Conditions for direct amplification of laser light by high energy e-beams are analysed theoretically in depth. The major results are:(1)the movement of high energy electrons in a powerful laser field is a conservative field movement, thus the condition for in-phase coupling is obtained;(2)proper coupling angles is necessary to insure the electro-magnetic wave to obtain energy from e-beams. It is pointed out that this new FEL is feasible.

The molecular orbital of the tryptophan and tyrosine is calculated from their molecular structure based on the HMO model and the mechanism of the selective excitation with the two-photon absorption is analysed.

Space-time analogy relation was applied to discuss the generation and propogation of ultrashort laser pulses. By the analogy between the diffraction of gratings and the generation of pulses, the results of pulse shape and satellite lines have been derived directly and in terms of the analogy between the diffractive spread in free space and propogation effects of ultrashort pulses in medium with group velocity dispersion, pulse width broadening, chirp and their compensation with phase conjugated mirrors are discussed.

Inspection of hypodermic syringe needle tips has been performed in our lab using an optical spectrum analysis system. The statistic processing method realized by a digitial computer is presented. The experimental results indicate that the minimal measurable defect size of damaged needle tips approaches the curvature radius of normal needle tips. When the defect size a is over 0.02mm, inspection ratio η is greater than 94.5%.

This paper introduces the light intensity data collection system of a microprocessor set, with a Z-80 microprocessor as its main unit, in the radius measurement of laser microbeams. For light beams of the order of micrometers, the error is about 1%.

Using a right angled prism coupler, simultaneous excitation of both transmission strip and m-line of the waveguide mode have been realized, thereby, the right angled prism coupler have the coupled characteristics of the symmetrical prism. Theoretical analysis has been made and the measuring method and results are given.

One dimensional heat-transfer equation for transverse-flow discharge lasers has been solved taking into account the gas flow. Based on the results, effects of both discharge power density and gas flow velocity on gas temperature distribution, gas density distribution and propa-gation property of optical beam through the discharge region are discussed.

The deflagration of ammonia and oxygen on Pt-Rh(10%）and other metallic catalysts initiated by a single pulse from TEA CO2 laser is reported. The laser power threshold for initiating deflagration on catalyst is lower than that in the homogeneous gas system. The laser ignition threshold depends on the laser frequency, different metals used as the catalysts, the total pressure of gas mixtures and the ratio of partial pressure of NH3 and O2. An intense yellowish chemiluminescence is observed after a single laser pulse. The mechanism of the reaction is discussed.

H-type polyvinyl alcohol iodine polarizer(PVA)irradiated by an intense laser beam exhibits anomalous transmission characteristics. We report here the experimental investig-ation and the mechanism explanation of this phenomenon.

The changes of the best standing wave frequency with that of temperature in acousto-optic mode-locked device were measured. The changing rate is about 8.0 kH_z/℃. A micro-thermostatical furnace and a temperature controlling circuit were developped on the basis of the above measurement. Over 5 hours stable and continous operation of the acoustic-photo active mode-locked Ar+ laser was achived.

This paper describes the experimental investigation of laser calorimetric technique for measuring bulk and surface absorption of various infrared transmission materials at 1.06μm and 10.6μm. Measurements show that using long-rod samples and the above mentioned exper-imental arrangement we can obtain absorption coefficients in the range of 10-5cm-1.

A quasi-CW power supply for the HCD laser experiments has been investigated. Using high frequency thyristor, the power supply gives near rectangular pulse output with appropriate duty factor. Its high efficiency, large peak current, variable controlled peak voltage and adjustable duty factor are convenient for the experimental study of HCD lasers.

Using the polarization properties of two-longitudinal mode lasers and adapting cooling fan method, the frequency and power of the intracavity He-No laser(633nm)have been stabilized synchronously. The relative frequency stability is 5×10(-9)and the power stability±0.5%.

The flat field and curved field scanning loci obtained by high inertial scanning system are reported and characteristics of curved field scanning are studied.

He-Ne laser was used from 1981 to 1983 to irradiate the rabbit skin with fibre-optic guided light and defocusing light one motor away. The results show the capillaries were slightly congested with imflammatory cells infiltration in the superficial parts of the dermis. Three minute irradiation proves to bring the best results and the fibre-optic guided light is more effective.