Advanced concepts in laser beam characterization

Chunqing Gao; Bernd Eppich; Guang Hui Wei; Horst Weber

doi:10.1117/12.361160

8 September 1999 Advanced concepts in laser beam characterization

Chunqing Gao, Bernd Eppich, Guang Hui Wei, Horst Weber

Proceedings Volume 3862, 1999 International Conference on Industrial Lasers; (1999) https://doi.org/10.1117/12.361160
Event: International Symposium on Industrial Lasers, 1999, Wuhan, China

Abstract

In the paraxial approximation a partially coherent beam can be characterized by its intensity moments. In the most general case a 3D beam has 10 second order moments, which describe the beam radii, far field divergences, radii of curvature, orientations in the near field and the far field, etc. The 10 second order moments can be written in a 4 X 4 symmetric matrix, called the variance matrix. In first order optical systems the variance matrix obeys a simple propagation law. The unknown parameters of the second order moments are the twist parameters, which describe the rotation of the beam during propagation. The twist is directly related to the z-component of the intrinsic angular momentum flux of the field. The ten second order moments can be experimentally determined by measuring the intensity of the beam in a reasonable number of positions around the focal region and measuring the beam twist.

Citation Download Citation

Chunqing Gao, Bernd Eppich, Guang Hui Wei, and Horst Weber "Advanced concepts in laser beam characterization", Proc. SPIE 3862, 1999 International Conference on Industrial Lasers, (8 September 1999); https://doi.org/10.1117/12.361160

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