On the basis of the intensity-moment formalism, certain analytical relationships are obtained for both the angular domain and the size of a transverse region of the beam that ensure a power content of at least 75% of the total power. As an illustrative application, the analytical results are compared with the exact values (numerically computed) of the amplitude of a lowest-order Gaussian beam diffracted by slits.
© 2003 Optical Society of America
Rosario Martínez-Herrero, Pedro M. Mejías, Salvador Bosch, and Arturo Carnicer, "Spatial width and power-content ratio of hard-edge diffracted beams," J. Opt. Soc. Am. A 20, 388-391 (2003)