Using a new energy model, the gain equaitons of exponential gradient amplitude and variable period Wiggler free electron lasers are obtained on the basis of single particle model. The results show that FEL gain will increase when amplitude and period of the mag’netic field increase along the z direction.

Resonance enhanced refractive-index change induced by two incident beams of different frequencies is discussed. The expressions of the coupled nonlinear refractive-index change are given for the sum-frequency and difference-frequency two-photon resonance conditions. Some experimental results of calcite, fused quartz fibre and benzene samples are discussed briefly.

Experimental setup and experimental results of an ultrashort cavity Rh-B dye laser pumped by frequency-doubled pulses from a mode-locked Nd phosphate glass laser are reported. The optimum operation conditions of the mode-locked Nd phosphate glass laser were studied by a combination equipment of TPF and OSA. A pulse train with pulse width of about 5 ps was’obtained. Using this picosecond laser as pumping source, an ultrashort cavity dye laser with tunable monomode pulses of less than 4ps and wavelengths ranging from 620.1 am to 641. 6nm was obtained.

We have found that the influence of polarizing direction of pumping pulse on the pulse width of synchronously pumped and mode-locked dye laser light in three solvents with different viscosities is proportional to the viscosities of the dye solvents. When’ the polarizing direction of the pumping pulse is parallel with the permitted direction of the dye laser, the laser pulse width would be shorter as the viscosity of the dye solvent is higher.

By using Ne instead of Ar as buffer gas, the kinetic processes of Kr3F* have been studied under fast discharge excitation conditions and intense fluorescence emission from Kr2F* has been observed. Three-body formation rate constants of Kr2F* have been measured by using time-integrated spectra method. It is pointed out that using Ne instead of Ar as buffer gas could enhance the emiss’on from Kr2F*.

The experimental results are reported on obtaining nanosecond dye laser pulses by means of "controlled resonator transients", using XeCl laser as pumping source. Comparing with N2 laser, XeCl laser is more suitable to shorter wavelengths and higher threshold systems.

A dye laser cavity with double-prism, beam expander and grating has been (synchronously pumped by repetitive pulsed mode-locked YAG laser light. For R-6G laser dye, the following experimental results have been obtained: pulse duration 30 ps,peak power of the pulse 7.6 MW, pulse repetition rate 20 Hz, averrage power 9.5 mW, line width 0.04 nm (close to the transform limited linewidth). The laser offers the advantages of stable output energy and easy wavelength tuning.

The failure of He-Ne laser is not due to the change of operating gas during the apan of He-Ne leser. The decisive factor is the damage and contamination of mirrors.

Based on van der Pol equation, the paper deduces the formulas describing the measurement of spectral linewidth of semiconductor lasers with delay self-heterodyne method, and discusses the influence of the spectral parameters on the measurement.Also reported are some measurement results on single frequency semiconductor lasers.

The small aperture effect and the lens-Jike effect formed by model HAW aerodynamic laser window are analysed and studied experimentally, and the advantages making use of the aerodynamic laser window in high power gas laser are described.

The giotrth. technique of single cryals ErxYi1-aAl3(B03)4 (EYAB) from a K2SO4-MoO3 flux, was investigated, The.phases of EYAB and KaMo3O10 compound3 have boon analysed with the methode,of-’TQ-A (JThermograylmetric analysis) and DTA (differentialthermal analysis)and X-cay diffraction, The defects in the crystals have been observed. Thestructure and the thermostability of the crystals were measured as well.

We have studied the statistical characteristics of laser beams propagating through a folded path in the turbulent atmosphere experimentally and theoretically. Experimental data COHflrmed the theoretical hypothesis of the amplification effects of scintillation. Using a concept of reflected amplification of beam displacement and arrival angle fluctuation, we investigated the amplification of the intensity fluctuation and obtained some results which agree with the experiments.

Testing apparatus and method for studying temporal coherence of gaa lasers are introduced briefly. The experimental results on the temporal coherence is reported in detail with output power, wavelength and electric current in particular.

A new method was devised for refining of marble, and some properties of processing were preliminarily summerized in the experiment of carving marbles of different colours and different crystallline grains by CO2 laser light.

The inductance of some components in the discharge circuit of microsecondflashlamp have been measured with an instrument of novel design for measuring inductance in the nano-Henry range. It provides the pertinent parameters for the development of high power microsecond pulsed flashlamp.

In order to investigate the safety of low-power CO2 laser therapy, experimental observation on mice and rabbits were carrasied out. The results showed that the irradiation of lowpower laser light has no adverse influence on skin and immunological function of organism.