论文信息 - Focal switch: a new effect in low-Fresnel-number systems.

Focal switch: a new effect in low-Fresnel-number systems.

It is shown for the first time we believe, that when a spherical wave illuminates a certain type of diffracting screen, in addition to the expected focal-shift effect, depending on the value of the Fresnel number of the focusing system, a focal switch effect can appear, i.e., an increase in the height of the lateral lobe of the axial-intensity distribution over that of the central lobe.

M Martínez-Corral | V Climent | M. Martínez-Corral | V. Climent

[1] M. P. Givens. Focal shifts in diffracted converging spherical waves , 1982 .

[2] J. Ojeda-Castañeda,et al. Off-axis focal shift for rotationally nonsymmetric screens. , 1993, Optics letters.

[3] W. H. Carter,et al. Focal shift and concept of effective Fresnel number for a Gaussian laser beam. , 1982, Applied optics.

[4] A. Arimoto. Intensity Distribution of Aberration-free Diffraction Patterns Due to Circular Apertures in Large F-number Optical Systems , 1976 .

[5] P. Avizonis,et al. Parametric study of apertured focused gaussian beams. , 1972, Applied optics.

[6] M Martínez-Corral,et al. On-axis diffractional behavior of two-dimensional pupils. , 1994, Applied optics.

[7] V. Mahajan,et al. Axial irradiance and optimum focusing of laser beams. , 1983, Applied Optics.

[8] Yajun Li,et al. Focal shift in focused truncated gaussian beams , 1982 .

[9] Yajun Li. Focal Shift Formula for Focused, Apertured Gaussian Beams , 1992 .

[10] A Pons,et al. Strehl ratio versus defocus for noncentrally obscured pupils. , 1994, Applied optics.