Abstract:

According to the characteristic that the definition point of the Q matrix of wave front is always located on the extremum point on the axis of the beam, a three-dimensional formula for the rectificative factor of phase in complex ray paraxial approximation is proposed, which calculates the rectificative factor of phase directly without considering the calculation of the main directions and curvatures and the rotation of the coordinates, thus simplifying the paraxial approximation calculation by the complex ray expansion (CRE) method. A big cell parallel calculating method is proposed, by which the calculation tasks are distributed to the processes，evenly spaced，according to RCS calculating angles. Results show that the calculating speed of the Large Open-ended Cavities’ RCS is about 102 higher than that of the traditional shooting and bouncing ray (SBR).

Key words: large open cavities, complex ray expansion, parallel calculation