Abstract
The Bessel beam (J0 beam) has potential for use in laser micro fabrication. We analyzed numerically the characteristics of a J0 beam at different distances between the optical axes of the Axicon and the source beam. When both optical axes are parallel, the generated J0 beam propagates along the optical axis of the Axicon. In the case of a top-hat source beam, both maximum intensity on the propagation axis and its propagation distance decrease with increasing distance between the optical axes. In the case of a Gaussian source beam, however, the ideal J0 beam characteristic is maintained almost completely, provided the distance between the optical axes is short.
