On the basis of measured expression from the rate equation, the stimulated-emission cross sections of seven lines of CO2 laser from 00?-10? transition at different conditions were measured by means of a pulse-amplification-gain technique, and 83 values of were obtained. Theoretical values of were calculated according to an analytical expression from the definition of The measured values of were compared with theoretical ones, and they are in satisfactory agreement.Finally,an analysis was made of the dependence of on the rotational quantum number J,its temperature and the pressure of active gas mixture.

The application of laser pulse in generating elastic wave is reported The experimental system is described which uses a ruby pulsed laser as light source and interdigital transducer as receiver. The observed results are discussed. It is shown that this method has great potential in non-contactive generation of elastic waye

Laser pulsed photoaeoustic effect in liquid and detection technique by beam deflection method are demonstrated. The possibility of sound velocity measurement in liquid is examined. An experimental device is designed and the sound velocities in water at different temperatures are measured.

A rapid scanning autoeorrelator suitable for measuring the duration of femtosecond laser pulses in real-time is described. The autocorrelator consists of an audio loud-speaker, an oscilloscope and an electronic controller. It has the advantages of simple structure, easy alignment and low cost

This article describes a simple experimental optical avrangement with slit image plane rainbow holograms are recorded using a single lager beam, and the pseudo-color encoding can be made at the same time.

Based on the concept of paired correlation speckle patterns, the mechanism of moize-specklegram is explained both theoretically and experimentally, and speckle-moira phenomenon are furthrer investigated.

Four kinds pf cavity configurations of dye lasers transversely pumped by high PEF CuBr lasers are investigated and their operating characteristics compared. The doable prism expander with Littrow mounted grating cavity is found to be the optimum. Linewidth achieved is 0.0012 nm in 598~640 nm range and the conversion efficiency is 7.5%. The amplified: spontaneous emission of 1.5% and single longitudinal mode operation areobtained.

Experimental results is presented which show that at the pumping level of 5W, when the beam divergence of copper vaper laser reduces from 8 mrad to 1 mrad, the outpnt power of the dye laser pumped with it will be doubled or more. Further improvement of divergence, however, can only result in slight increase of effcency of the dye laser. This conclusion is in good agreement with the simple analysis of geometric optics. Thus, injection locked unstable resonator is the best arrangement for copper vapor laser as pumping source for dye lasers.

Design considerations of the saturable readtor used for copper vapor lasers are given. The experiments show that the use of saturable reactor improvess the switch. performances of thyratron and increases the pulse repetition frequency and input electric power

A notel two-channel discharge pumped excimer laser is reported. Two sets of LC pulse forming were line connected with the main dischange capaeitors respectively and oontroled by a common spark gap, discharged to their own channel. A pulse duration of 60 as from XeCl excimer laser was obtained, which was operated at fine sychronism(jitter time 4ns).The energy of each laser beam was 120mJ.

Taking a transverse flow electrically excited CO2 laser as an example, the changing role of batput power and:activation feature with the flow velocity of the melium have been studied by means of physical mechanics, together "with the microdynamic inechanism concerning the change of energy transfer among energy levels in nonequilibrium flow laser medium.

The role of bromine in GuBr lasers was investigated by computation and experimental measurement and the explanations of some phenomena and relationship are given.

The temporal coherence and the changing rule of laser transmitting through an optical fiber are investigated experimentally, and an experimental Inethod to determin the temporal coherent function is put forward.

Using the pulsed HOD, we have obtained the He-KrII laser with average power of about 6 mW and the peek output of 10 W. The maximum gain is about 103%m-1, and the temporal and spatial distributions of the gain have been measured.

In this paper the synthesis of laser dye oxazine-9 is described briefly. The laseroutput with band width between 640~675 nm pumped by 532 nm laser pulse is obtained. Laser conversion eificiency can reach to as high as 22%. The laser threshold energy is about 0.78mJ.

Critical slowing down for LD/PIN bistable optical semiconductors and the critical slowing down exponents for this system have been investigated experimentally. The experimental value r-0.53, is basically in agreement with the theoretically predicted value of 0.5.

The dependence of the round-trip matriee elements on the position of reference plane is given, The variable method for mode calculations of multi-element cavity has been demonstrated. Some cavity modes are calculated by this method as examples.

A new crystal BO:3Al2O3:Gr3+, grown by Czoehralski method is reported. Absorption spectrum and fluorescence spectrum at room temperatures were measured. Three nm.sharp lines of fluorescence spectrum are at 695, 692.5,and 691 nm.4T2 emission is from 700 to 900nm. The crystal-field levels were calculated according to static electronic field model. The parameters such as crystal field, strength Dq, Eacach parameter B and C and E were calculated to be 1663, 643, 3180 and 589cm-1 respectively.

We report the experimental research of optical bistabilty and instability at room temperatures in 200 micron thick Kg1-xOdxTe FP etalons with x=0.234 and x=0.223 using 100 ns TEA CO2 laser pulses.