Intensity-moments characterization of general pulsed paraxial beams with the Wigner distribution function

摘要

On the basis of the space-time Wigner distribution fimction (STWDF), we use the matrix formalism to study the propagation laws for the intensity moments of quasi-monochromatic and polychromatic pulsed paraxial beams. The advantages of this approach are reviewed. Also, a least-squares fitting method for interpreting the physical meaning of the effective curvature matrix is described by means of the STWDF. Then the concept is extended to the higher-order situation, and what we believe is a novcl technique for characterizing the beam phase is presented.