Biomedical subjects

Xiquan Fu

Publications and source records attributed to Xiquan Fu.

2 recordsLinked to original sources

PubMed2002

Laser-plasma electron-density measurement using x-ray interferometry.

In this paper, the propagation of x-rays in laser-produced plasma is studied both analytically and numerically. The coupling relation between phase and amplitude of x-rays is derived, the solutions with higher-order corrections are given where the higher-order electron-density gradients have been taken into account. An important parameter eta was introduced, which is related to the errors of the electron-density measurement using x-ray interferometry. It is justified that so long as eta<1, the x-ray interferometry can be used for the measurement of electron density and for greater value of eta, higher-order modifications are needed.

Journal Article↗

PubMed2002

Spatial nonparaxial correction of the ultrashort pulsed beam propagation in free space.

In this paper, a family of integral solutions representing ultrashort pulsed beam propagation in free space is studied by using the comoving frame coordinates and the Fourier transformation for time variable in terms of well-known paraxial approximation. The pulsed Gaussian-like beam solution is obtained as a special case of the integral solution, where the pulsed Gaussian beam solution is included. Further, starting from the nonparaxial pulsed beam propagation equation in the temporal-frequency domain and making use of the spatial Fourier transform, the nonparaxial pulsed beam solution is derived based on the paraxial pulsed beam solution, where the nonparaxiality is evaluated by a series of expansions.

Journal Article↗