Optical limiting of CW lasers by utlizing thermal self-defocusing has been studied in detail. Analystic formula that describe the relations between input and output power of the limiter are given. Experimental results are in good consistence with theoretical simulations.

Nonlinear chirped grating coupler of CdSxSe1-x doped glass waveguide was fabricated and its optical control spatial scanning effect was obtained experimentally for the first time. Operating nature of the observed phenomenon is thermal nonlinearity.

Light waveguide thin film of dye DR-2GLF doped polystyrene is prepared by solution deposited method, and poled by electric field. The EO effect of poled film are affected by dye concentation and poling time, and EO coefficient y≈35pm/V, which is larger than inorganic EO materials such as LiNbO3.

In this paper, the composition, physical chemistry properties and preparation techniques of Tb2O3-doped borosilicate and phosphate glasses for Faraday rotation glasses are studied. Experimental results show that the Verdet constant changes with the variation of terbium ions concentration, when the Faraday rotation glass contains 20% (mol) of Tb2O3 the Verdet constant is -0.0030 min/A/m·cm. Using the special preparation techniques large size sample with high quality could be fabricated in platinum crucible.

According to the basic principle of CWEOP (Continue Wave Electro-Optic Probing), we detect the distribution of the electric field of two types of GaAs/GaAlAs heterojuction lasers (the proton- bombed and the broad- area contact). The experimental results obtained at different areas and under different bias conditions reflect the characteristics of lasers such as carrier confinement, the change of the distribution of electric field corresponding to different bias currents and the distribution of electric field under negative bias.

An optical system with hologram for perfect shuffle is presented.

The location and distribution of the slits synthesized by translating object and imaging lens in one-step rainbow holography are analysed systematically, and the method of obtaining a suitable location and width of synthetic slit is also given.

Chain-of-spherical magnetic iron UFP have been prepared by irradiating Fe (CO)5/SF6 system with a CW CO2 laser. During nucleation, the Fe vapour was let to pass through a orientated DC magnetic field, so as to improve anisotropy of the powder. It was indicated by comparing the two different conditions of nucleation that laser pyrolysis may acquire a higher pressure range of preparation and higher efficiency than gas evaporation.

The constructure characteristics of laser glazing Fe-Ni-Cr-Si-B alloy melted on to a low carbon steel substrates in vacuum furnace. Were investigated by using of electron microscopes and X-ray diffraction (XRD). The existance of the amorphous layer was confirmed.

The microstructure characteristics of the laser-clad oxide ceramic coating based on the mixture of A12O3 powder and ground enamel frit containing Co and Ni was investigated. The formed coating consists of the Fe-Si-O thin layer clinged to the carbon steel substrate, the large-sized equiaxial grain layer in the middle and the outer small-sized dendrite layer. The formation mechanism of the microstructure is explained by the theory on the nucleation and growth of crystal, and the low thermal conductivity of oxide ceramic was considered the main factor for it.

Using a CW ring frequency stabilized and doubled Ce:Nd:YAG laser with 6mirrores, we obtained 500 mW second harmonic generation (0.53 μm) as pumping power is 2 kW. The intensity fluctuation is less than 7% and the frequency stability is better than 10 MHz.

Wide-band wavelength tuning properties of external cavity semiconductor laser (ECL) with strong feedback configuration are analyzed in this paper. A formula of maximum tuning range is given in theory and an ECL with 120 nm tuning range (1. 45-1. 57μm) is achieved experimentally.

The experimental results of semiconductor lasers about the relations between low-frequency noise spectral density and reliability of devices are reported in this paper.

This paper first connects rotational plate method with variable output coupling method and gets small-signal gain of 1.60×10-3 and 1.75×10-3 cm-1, intracavity loss of 12.0%. Saturation parameter of 3.00 kW/cm2. A comparison of these results with the published data of other COIL systems is also presented.

The complex beat spectra of oscillation modes on argon-ion laser with strongly exciting was obtained. The experimental phenomena are explained by the theory of mode splitting.

dual-wavelength CO2 laser; four operating frequencies; frequency stabilization; multi-wavelength interferometry

Experimental studies of intracavity Raman laser are presented in this paper. The first Stokes pulse output with pulse width of less than 6ns is produced by placing a methane gas cell at high pressure inside closed resonator of a pulsed Nd:YAG laser. The cell sealed windows simultaneously act as the functions of focusing and collimating lens, which has reduced bulk of the laser and wastage inserted in the cavity. The lasing threshold at 1.54 μm of 3.9 J and the overall energy efficiency of 0.26% of the system are obtained. The test of the Raman laser life was conducted.

The output characteristics of travers exciting N2 laser was studied experimentally. The laser output power was increased by 70% dwe to heating the cathode. The divergency of output beam was reduced obviously.