Generation of supercontinuum bottle beam using an axicon

Abstract

A supercontinuum bottle beam was successfully produced by focusing a supercontinuum laser beam after passing through an axicon. The supercontinuum radiation was generated from a microstructured fiber pumped by a self-kerr-lens mode-locked femtosecond Ti:sapphire laser. The cross-section intensity distributions of the generated bottle were recorded by a beam profiler. Using the line filters to select different central wavelengths, the different colors of bottle beams show slightly different bottle ranges and diameters due to the dispersion of axicon and focusing lens. The results consist with the theoretical prediction using the Fresnel-Kirchhoff's formula in considering an incident Gaussian beam.

Formation of Bessel light pulses by means of a conical mirror

“…Monochromatic BLB are most often produced by methods based on annular diaphragms and lenses [7], as well as on axicons [8]. When these methods are used to create ultrashort Bessel light pulses (BLP), distortions of the pulse envelope owing to dispersion can have a significant effect.…”

“…At the same time, there have been few studies of pulsed Bessel light fields made up of a superposition of BLB whose frequencies lie within a certain interval. These fields can combine the advantages of monochromatic BLB and ultrashort pulses with a high local luminous energy, so they offer some promise for use in ranging systems, for controlling electrical discharges [5], and for forming cluster plasmas [6].Monochromatic BLB are most often produced by methods based on annular diaphragms and lenses [7], as well as on axicons [8]. When these methods are used to create ultrashort Bessel light pulses (BLP), distortions of the pulse envelope owing to dispersion can have a significant effect.…”

“…4) that, with increasing distance from the conical mirror, in the first half of the diffractionless zone (z ≤ z d /2) the maximum of the envelope of the formed pulse moves at the group velocity given by Eq. (8). As the boundary of the diffractionless zone is reached (z → z d ), there is an increase in the phase difference between the partial BLB which form the BLP, and this causes a distortion of the envelope: the propagation velocity of its maximum now differs from the group velocity.…”

Focusing Bessel Beams by a Lens with Strong Spherical Aberrations

“…Axicons and their combinations can be used for many applications, and for the first time this came to attention in [1], where a number of specific schemes is considered as well. In particular, a variety of papers are devoted to the calculation and analysis of a focusing scheme consisting of a thin lens and an axicon [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. This combination can be used to obtain a high-quality focal ring.…”

“…The axiconlens system is also of interest in the context of feasibility to form an unusual axial distribution of intensities. It is found that, for a certain choice of the Fresnel number of an optical scheme and diameter of the Bessel beam, the axial intensity distribution is characterized by the existence of two distinct foci located to the left and to the right of the geometrical back focal plane [4,8,10,12,14,16].…”