Two-photon laser continuous oscillation process in terms of reduced optical blocn equation is discussed. Itoe formulas on gain and saturation effect, dispersion and frequency pulling of,the laser material under the stationary condition are obtained. The results are compared with those of one-photon laser oscillation process.

The principle, set-up and experimental results for measuring the phase and width of picosecond light pulses by third order correlation function method are reported. The experimental results are compared with those measured by TPF method.

Characteristics of optoglvanie spectrum in He-Ne discharge plasma oscillation have been investigated experimentally. The plasma oscillation frequency-spectrum has been measured by means of resonant OGE.

The emission and detection of super-soft X-ray from laser produced plasma are discussed.

A CARS arrangement for measurement of Raman frequency shift has been established. The frequency shifts and the shape change in nitrogen and nitrobenzene gas-liquid phase changes have been measured.

The aberration characteristics of 3-D holographic scieens are Studied on the basis of exit pupil image of projection,lens formed by holographic screen and the deviation of exit pupil image from Gauss image.

Contour fringes of MgO crystal grain were obtained by means of double exposure in JEM-200 GX heat emission electron microscope with LaB6 filament as electron beam source and Mollenstedt electrostatic biprism as electron beam splitter.

Parameters of the axial guiding magnetic field in free electron laser based on stimulated Eaman scattering are determined. Having measured the guiding field and the e-beam it confines, we carried out preliminary parametric study and obtained free-electron laser radiation in Ka band.

By infracavity frequency doubling of CW rhodamine 6Gr ring dye laseroutput using an angle tuned a-LiIO3 crystal placed in tier laser cavity, CW tunable UV radiation over the range of 29500-301.5nm has been generated. It enables the single frequency to be scanned continuously over 30 GHz. The UY output of up to 100W has been obtained.

A method for direct.jneas.ure.inent pf per.iodic length of self-ifceasing media is put forward, with which inhomogeneity can also be observed directly and the rejeyant distri-bution constant is thus obtained. In’addition, it can also lie’used to judge the ion-exchange depth, the optical axis of self-focustktig rod knd the axial distribution plate.The inethod is alsoused to measure n0 simultamouly.

An actively mode-locked laser adopting prelasing technology is described. Its pulsewidth stability is +5% and can be adjusted from 300 ps to 1500 ps. The pulse energy is about 200 uJ, the amplitude fluctuation is less than +3%, and the signal to noise ratio is better than 107.

A brief introduction is given on the structure design of NdP5O14 minWasers. The optimum matching size of pumping lamp and laser rod is presented for this kind of laser. Output with divergence angle of less than 5 mrad and a peak power of over 4 MW hava been obtained.

The experimental results on the timing of a copper vapor laser oscillator-amplifier system show that the timing property curve (the amplitude of amplifier output versus delay)was not symmetric, and timing properties of green beam (510.6 nm) and yellow beam x(578.2nm) were not the same. The jitter of the thyratrons was +4ns, which induced an output amplitude fluctuation of 10%-20%. The output power of the amplifier was 15% higher than that of an oscillator when the timing was correct.

A high pressure transverse electric excitation sealed-off 2 kW CW CO2 laser with high efficiency for industrial use has been developed. Its output power is over 2.3kW with an energy conversion efficiency of higher than 17% during the continuous operation of 13 hrs. The discharge and output power characteristics have been investigated and the electron temperature and density have been measured under various discharge conditions.

In this paper we report some experimental results of laser heat treatment on surface coatings of grey cast iron, 10# and 20# steel using a transversely-excited flowing kW CO2 laser.Suitable conditions for forming coating and alloying layers with laser light on various substrates are given.

The effects of some parameters in XeCl excimer laser with automatic preioniza-tion on the laser output are described. The maximum output energy of 120 mJ per pulse has been obtained when the ratio of storage capacitor Cs and peaking capacitor Op is equal to 2.

9.4m E (30) line from a TBA-CO2 laser was used for pumping FH8. Tunable NH3 laser light in 12 um band have been obtained. The output energy at 12.247 um, 12.261 um and 12.079 m is 18.6,23 and 26mJ respectively.

A method is reported for continuously measuring laser amplitude noise. The bandwidth is 2.0 Hz-lMHz. The minimum measurable noise power is about 0.2μW.

By changing the shape of the middle part of a He-Ne laser rectangular capillary tube, the discharge plasma can be partly bended under the action of alternative magnetic field. Thus a new type of magnetically modulated laser can be obtained. The glow shrinking effect is studied and some experimental results are presented.