Wang Shiji

GENERALIZED FRESNEL DIFFRACTION INTEGRAL AND ITS APPLICATIONS

Within the generalized definition of ABCDGH matrices, the conventional ABCDGH diffraction integral is extended for a misaligned complex paraxial system with a curved optical axis. On this basis the transformation law for Gaussian-Schell model beams through an ABCDGH systems is derived, the propagation behavior of the mutual coherence function through ABCDGH systems in the presence of random media is investigated as well.

Experimental Diagnosis of Plasma Jets by Using X-Ray Laser

The supersonic jets and the interaction of strong shock waves are ubiquitous features of the nonlinear hydrodynamics of inertial-confinement fusion, astrophysics, and related fields of high energy-density science, so it is very important of laboratory studies on it. In this paper, a laboratory experimental study is reported. The jets were created by a ns laser pulse irradiating a specific target, and the shadow of jets were measured by an x-ray laser probe with wavelength of 13.9nm. The legible images of jets were recorded, and the experimental results and theory simulation were qualitative agreement.

Tending to Saturated Gain of Soft X-Ray Laser at 23.2 and 23.6Nm

We proposed a design named “Four-Target Series Coupling” to work, on soft x-ray laser in Ne-like Ge plasma. The total length for four targets is up to 5.6cm. The gain length product (GL) for small signal is up to about 18 for both lines at 23.2 and 23.6nm , and the effective GL is 16.4 and 15.7 for these two lines respectively. These two lines are obviously tending to saturation. The divergence of X-ray laser beam is about 3 ˜ 4 mrad. Before experiments, we developed a series of codes to simulate these experiments, got the parameters about the distance and angle between the targets in order to get best coupling.