Focal squeeze in axicons
Abbreviated Journal Title
diffraction; wave propagation; TRAVELING NONDIFFRACTING BEAMS; EFFECTIVE FRESNEL-NUMBER; BESSEL BEAMS; 2ND-HARMONIC GENERATION; GAUSSIAN BEAMS; SHIFT; INTERFERENCE; WAVES; EFFICIENCY; DEBYE; Optics
The on-axis irradiance distribution of a truncated conical wavefront is evaluated in terms of the Fresnel number of the focusing geometry. In agreement with geometrical optics, a focal line of increasing intensity is generated for extremely high Fresnel numbers. Otherwise clear deviations may be observed for the position of the maximum irradiance along the optical axis. A remarkable focal squeeze appears and, for decreasing Fresnel numbers, this effect manifests stronger. An analytical formula is provided for the fast evaluation of the focal squeeze. (c) 2005 Elsevier B.V. All rights reserved.
"Focal squeeze in axicons" (2005). Faculty Bibliography 2000s. 5824.