This paper deals with the theory and application of the partial coherence of light.

The generation of partially coherent laser beam directly from a spatial-temporal phase modulated opticaal resonator is achieved experimentally.

In this paper,we study the generation partially coherent vortex beams by passing of Gaussian Schell-model beam through a spiral phase plate(SPP) with arbitrary integer singularity of order n.

Based on the unified theory of coherence and polarization of random electromagnetic beams and the propagation law of partially coherent light,the change in the degree of polarization of beams which is generated from a partially coherent source after passing through a series of circular apertures was investigated.

Propagation and diffraction of partial coherent light in uv-lithography;

To give an error analysis of this effect,the propagation of partial coherent light in the proximity UV-lithography was investigated and the relative theoretical model was proposed.

Based on the propagated law of the mutual intensity with the partial coherent light (GSM), the characteristics of the irradiance distribution in Young s experiment are investigated with GSM.

Focusing properties of partially coherent light passing through an astigmatic lens;

Analyzing the focused field properties of partially coherent light;

The results show that the amount of the focal shift depends on not only the Fresnel number of the annular beam,but also the spatial coherence and the central obstruction ratio of the incident partially coherent light.