Energy distribution of the ring laser beam was studied, laser power distribution model in the scanning line-width direction was set up; the energy connection about the ring laser beam and and the laser power that the melted wire required was reached out ; the droplet model and the force balance equation was also set up.

Model wavefront reconstruction with Zernike circular polynomial and Zernike annular polynomial for annular laser beam are researched.

Beam-splitting effect of circle spot laser beam in kerr-medium;

Focal shift and focal switch of partially coherent annular beam focused by lens;

This paper aims at the annular beam used for generating the optical-tweezer.

Taking account of the transmission characteristics of the diaphragm and the saturation of the gain in the process of light amplifying,the evolution of the beam inside the Cassegrain multi-pass amplifier is numerically simulated by using the ray-tracing and split-step fast Fourier-Bessel transform(SSFFT) methods,the annular beam is coming from Q-switched Nd∶glass laser with ring cavity.

One novel arc robotic visual sensing system was constructed using proposed circular laser vision sensor,which could be used for welded seam location and seam tracking.

Vision sensor based on circular laser trajectory used for weld location and seam tracking was developed.

Considering "spot" or "line" laser trajectory has such shortcomings as less information,ambiguous explanation and single tracking direction,a novel optical scanning system based on circular laser was developed using the combined lens method.