A pulse pumped Nd: YAG laser, mode-locked with an acusto-optic modulator and amplified with an electro-optic Q-switch is described. The pulse widths of the laser output range from 200 ps to 1 ns. About 0.1 mj is obtained for a single pulse and the stability of the peak values of the pulse train is better than 90%.

A passively mode-locked Nd: YAP laser is reported. More stable mode-locked trains of ultrashort pulses are obtained, with a pulse-width of 10 ps and the contrast ratio for two-photon fluorescence of~2.8.

Infrared spectrum of LiNdP4O12(LNP) crystals is reported. Structural properties of LNP were explored in comparison with the infrared spectra of neodymium pentaphosphate (NPP) crystals and other rare-earth tetrametaphosphates. Phenomena such as nonabsorption of OH radicals, bridge bond P-O-P high frequency shift as well as band splitting are explained.

Trifluoroacetates of 14 rare-earth ions were successfully prepared. Thus, we were albe to solve the problem of doping these ions by dissolution and eleminating the quenching action of water in the system of POCl3-SnCl4 or ZrCl4. The effects of various rare-earth ions on laser performances and fluorescence life-time of the Nd3+:POCl3-P2O3Cl4-SnCl4 system were observed. The results showed regularity in certain aspects.

A CW silver ion laser by hollow cathode discharge is described. The device structm-e and some experimental results are presented. An output power of 30 mW has been obtained with 50 em long discharging length.

In this article a He-Cd laser operating in a nonuniform magnetic field is reported 100 milliwatts at 4416 A is obtained, which is 40% higher than that obtained without magnetic field In the vicinity of laser threshold, the power increase is up to 100%. It is also found that the power increase at .3250 A is even more obvious.

Computer holograms, Lohmann holograms in particular, are discussed in this paper. Lagrangiun iuterapolated binary Fourier holograms of two dimensions are programmed and computed, and modification of the phase errors of Lohmann holograms is made. It improves the reconstructed image quality and pushes forward the applications of computer holograms.

The optical microdiagnostic experimental results are presented on laser plasma by raeans of an image transfer system with long optical path.

The experimental results on transformation hardening of 6 kinds of metals have been reported by using a HJ-1 CO2 laser. The effect of technical parameters of the laser on the structure of surface hardening and its characteristics have been investigated. Optimum parameters of laser transformation hardening for these metals have been found. And the experimental results of laser hardened V-guide slide were compared with those of common heat treatment.

In the separation processes of boron isotopes by multiple-photon absorption of infrared radiation, a new photochemical products were produced from the Loser induced photochemical reaction of BC13 and CnF2n+2. A strong absorption peak of the new photochemical products at 1000 cm-1 overlapping with the v3 vibrational absorption band of 10BC13 thus the measurement of boron isotopes enrichment coefficient by infrared absorption spectra would be interfered.

This paper reports the effects of He-Ne laser on anaesthetizing 150 experimental equities. Effects of different laser power level were compared and the combining effects of laser with 2.4 xylyencaminotheazole injection were also observed.

In this article preliminary experimental results are reported of the changes in iso-zymes in rice sprouts irradiated by He-Ne laser light.

Self-consistent integral equations for the field distribution of the rasonant modes of virtual (real)concentrie resonators and semi-concentric resonators with circular mirrors were solved by comparing with that of plane parallel resonators. The amplitude distribution of field intensity on the mirror surfaces of the concentric or semi-concentric resonators are just the same as that of symmetric plane parallel resonators consisting of two identical plane mirrors seperated by a distance which equals to 2g2 times of the cavity length of concentric or semi-concentric resonators. The power loss per round trip of resonant mode of concentric or semi-concentric resonators just equals to that of per transit of the resonant mode of the plane parallel resonators mentioned above.

When pure nitrogen is excited with transverse double discharge, high gain stimulated emission at 3577A in nitrogen molecules is observed. The laws for increasing nitrogen laser power at 3577 A were studied by adding SF6 to N2, and the effects of SF6 on discharged molecular nitrogen laser are discussed.

This paper describes the active mode-locking of an Ar+laser by using a temperature compesated acousto-optic modulator. Pulse trains at 5145 A have been obtained with a pulse width of about 1 ns and repetition period of 10 ns.

An electron-beam preionized, electrically excited gasdynamic CO laser has been developed, and preliminary experimental research on it/ s performances has been made.

The experimental research on spectral tuning of ArF excimer laser is reported. Frequency tuning for the UV-preionized discharge ArF excimer laser has been performed by using a simple two-prism arrangement.The tunable range is 1926 A~1944A, and the linewidth is about 0.9 A.

Effects of gas constitution and electrode material on the life-time of sealed-off CO2 lasers have been studied. It is pointed out that the removal of N2 is an important factor affecting the life-time. CW operation life-time of the laser has been obviously improved when electrode of pure silver and gas mixture of CO2, CO, He and Xe are employed.

A new method is presented for determining the gas pressure P and the gas partial pressure ratio n in He-Ne lasers by means of measuring intensity ratio of He-Ne spectral lines. The accuracy is ΔP/P≤6.7% and Δn/n≤12%.

This paper describes a simple and reliable method of measuring the linewidth and profile of a He-Ne laser line at 6328A by means of optogalvanic spectroscopy.

A new laser calorimeter has been developed with semiconductor thermopile as the te mperature sensor. Compared with metal-wire thermopiles, they have the advantages ofhigh-sensitivity, lower electrical resistance, and the manufacture technology is simple.It can be used for the energy measurement of laser pulses at an wavelength range from 0.3 m to 10m and energies from 0.013 to 15 joules, with an absolute accuracy of 5%.

In this paper the principle, configuration, behaviour and error analysis of the bulk absorption calorimeter which has large measurement range for ps pulsed laser radiation are reported. The measured energy ranges from 2 mj to 20 j, the operating wavelength ranges from 0.3m to 2m and 4m to 10m, the cooling time constant is about 73~75sec., and the accuracy of measurement is 5%.

The direct photography is described of the process of the vibrating state in a bronze antique"Fish-Wash-Basin"by time averaged stimulated holography. The experimental results illustrate the principle of sputtering water. It provides an effective method in antique research.

Optical radar principle of pulse reflection is applied, a GaAs single heterojunction laser is adopted as its pulse light source and an aspherical lens system is used to couple the light into the fiber. The reflected pulses are detected by a PIN diode, amplified and sent to a special counter. The displayed digits shows the distance between the fault in the fiber and its measured end. Accuracy of the apparatus is 2.5M; measuring length: 1.5kM (attenuation of fiber: 10dB /kM).

An efficient and simple charging and triggering circuit is given. The charging time is within 3 sec, and the efficiency up to 78% as the storage capacitance reaches 50f and charging voltage to 800 V.