A novel tunable all-fiber laser using Er3+/Yb3+-doped single-mode fiber ring resonator has been demonstrated. In our specially designed all-fiber configuration, a tunable fiber coupler was used not only for coupling the Er3+/Yb3+-doped fiber to become a ring resonator but also for wavelength tuning. In addition, there are not any reflective elements in the laser so that the excess loss was very low. A wavelength tuning range of >70nm was obtained. The design and experimental results are reported in this paper.

In a white-light optical processing system, if the filter apertures vibrate randomly around the rainbow diffraction spectra at Fourier plane, the amplitude grain noise of the grating encoded film in the output plane can be suppressed considerably and the output SNR is improved. Experimental results are given in this paper.

A new digital speckle metrological technique called white light digital speckle photography is presented. 2-D digital decentric filtering and 2-D digital correlation techniques are suggested to be used to represent the whole field information and point information respectively. The metrologioal method, theoretical analysis and experimental results are described and given in detail.

In this paper, white-light speckle shearing interferometry with the source encoded——a method for speckle shearing interferometry under the illumination of incoherent source is proposed. While the source is encoded with a grating, the coherence of two points on the object is enhanced and the wavefronts of the sheared two images become mutually coherent. Thus the white-light speckle shearography is performed.

A study on the spatial characteristics of Li-like soft X-ray laser in a laser-produced silicon plasma is reported. It shows that the main region of the soft X-ray laser gain is in the region with intermediate plasma density, which is about 300 μm from the target surface, while the gain coefficient near target surface with high plasma density is small.

It is reported for the first time that a 30 ps pulse is generated from the short cavity dye laser pumped by a copper bromide laser with 25 ns pulsewidth and 10 kHz-repetition rate, when mixing an amount of saturation absorber DODCI with gain medium Rh6G solution. Theoretical considerations about the pulse compression by this method are shown to agree with the experiment. Furthermore, the synchronous amplification and tuning of the dye laser pulse have been achieved with a dye amplifier-dispersion system, and reached almost Fourier-transform limit.

This paper reports for the first time that the pulsewidth of copper bromide laser has been compressed to be almost Fourier transform limit by injection amplification. The output characteristics are investigated in detail.

The theory of mode coupling in dye laser system is applied to tri- or multi-frequency dye laser (TFDL or MFDL). Oscillation condition related to the parameters——gain to loss ratio number of modes at one frequency——is deduced. An oscillation dynamic equilibrium diagram for TFDL and its correlated tuning heory are presented and discussed.

The stimulated collision-induced fluorescence (SCF) at wavelengths of 551.9, 606.3, and 611.1 nm was observed from XeCl-laser pumped barium vapor for the first time. They correspond to the following transitions of barium atoms respectively: 6s6d3D2-6s6p3P1, 5d6p2-6s5d3D3, and 5d6p2P1-6s5d3D2. The possibility of exis-tance of the barium spin-forbidden transition 6s7d1dD-6s6p3P2 was proposed and discussed.

The power spectrum of the autodyne signal of CO2 laser was analysed by the high-speed data acquisition and processing system at 10 MHz. The power spectrum is distributed in the low-frequency region. The bandwidth of the autodyne signal is increasing with the Doppler frequency shift. The integral of the power spectrum for frequency is converged at the power of the autodyne signal. The experimental results show that the analytic method by high-speed data acquisition and processing has more advantages over the spectrum analyzer.

In this letter, we report a novel bistable optical device composed merely of a laser diode (or LED), two PIN photodetectors and several electronic components. The effect of hysterisis has been experimentally demonstrated. The operational modes of the device, such as optical memory, optical switching, optical pulse shaping have also been achieved. The operational principle, optoelectronic hybrid integrated, technique and characteristics of the present device are described.

The autocorrelation function of two-photon photoconductivity signals is studied and the relation of contrast ratio and laser intensity is presented. A second order laser intensity autocorrelator of semiconductor GaAs is fabrioared to measure the two-photon autocorrelation function of Nd: YAG laser pulses train.

With supersonic molecular beam and time-of-flight (TOF) mass speotra technique, we studied multiphoton ionization/dissociation (MPI/D) prosess of SO2 at 308 nm laser radiation. In our experiment S+, SO+ and SO2+ signals were observed. We also measured the dependance of each ion signal on laser intensity, and discussed the possible multiphoton ionization/dissooiation mechanics.

Based on the method of phase object display, this article propose possibility of showing phase gradient of the object by effect of aeousto-optioal Bragg diifraotion can realize. Mathematical expression formula is derived and some discussion is presented.

Fundamental concept and fabricating method of nonlinear gnided-wave periodic structure are described in this paper. Grating couplers are made on InSb and semiconductor doped glass waveguide. Nonlinear coupling effects are observed experimentally. Their practicabilities are discussed.

Laser Enhanced Ionization (LEI) spectrometry of rareearth element Europium (Eu) is studied. Single photon resonance LEI spectrometry of EuI 287.779nm, EuI 287.887nm, EuI 289.254nm, Eul 280.303nm and EuI 289.383nm are detected by UV tunable laser and two photon resonance LEI speotrometry of EuI also are deteoed by visible tunable laser. The meohanism of excitation and ionization of Eu atoms are discussed. The detection limit of the element Eu is about 10 ng/ml.

By using the multi-step excitation technique, Sr atoms are excited from ground state 5S2 to (4d3/2np, nf)J=1 and (4d5/2np, nf)J=1 autoionizing states via valence state 4d23P0. Their Stark spectra near n = 12, 13, 14 in an electric field of 0-5kV/cm are observed and discussed.