Generation of single-charge optical vortices with an uniaxial crystal.

We implement a novel experimental technique for generating mono- and polychromatic optical beams with on-axis single vortex by manipulating polarization singularities of light in birefringent crystals. We demonstrate that, in contrast to the well-known optical quadrupoles generated by beams propagating along the optical axis of a uniaxial crystal, the beam bearing isolated single-charge on-axis vortex can be generated if the incident beam is tilted with respect to the optical axis at a certain angle.

[1]  Alexander V. Volyar,et al.  The fine structure of singular beams in crystals: colours and polarization , 2004 .

[2]  Oleg V. Angelsky,et al.  Interferometric methods in diagnostics of polarization singularities , 2003, International Commission for Optics.

[3]  Mark R. Dennis,et al.  Polarization singularities from unfolding an optical vortex through a birefringent crystal. , 2005, Physical review letters.

[4]  Yuri S. Kivshar,et al.  Optical vortices and vortex solitons , 2004, SPIE Optics + Photonics.

[5]  Michael V Berry,et al.  Coloured phase singularities , 2002 .

[6]  M. Berry,et al.  Dislocations in wave trains , 1974, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[7]  Mikhail V. Vasnetsov,et al.  Optics of light beams with screw dislocations , 1993 .

[8]  N. N. Rozanov.  Propagation of laser radiation in anisotropic media , 2002 .

[9]  M. Berry.  Conical diffraction asymptotics: fine structure of Poggendorff rings and axial spike , 2004 .

[10]  A. Volyar,et al.  Dynamics of topological multipoles: II. Creation, annihilation, and evolution of nonparaxial optical vortices , 2002 .

[11]  L. Torner,et al.  Chapter 5 - Optical vortices and vortex solitons , 2005 .

[12]  Michael V Berry,et al.  Conical diffraction asymptotics: fine structure of Poggendorff rings and axial spike , 2004 .

[13]  Miles J. Padgett,et al.  Observation of chromatic effects near a white-light vortex , 2003 .

[14]  M. Berry,et al.  The optical singularities of birefringent dichroic chiral crystals , 2003, Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[15]  Mark R. Dennis,et al.  Polarization singularities in paraxial vector fields: morphology and statistics , 2002 .

[16]  M. Soskin,et al.  The relationship between topological characteristics of component vortices and polarization singularities , 2002 .

[17]  Andrew G. White,et al.  Generation of optical phase singularities by computer-generated holograms. , 1992, Optics letters.

[18]  Wieslaw Krolikowski,et al.  Focusing and correlation properties of white-light optical vortices. , 2005, Optics express.

[19]  M S Soskin,et al.  Nonlinear singular optics , 1998 .

[20]  Oleg V. Angelsky,et al.  Interferometric methods in diagnostics of polarization singularities. , 2002 .

[21]  Marat S. Soskin,et al.  Computer-synthesized hologram-based rainbow optical vortices , 2004 .

[22]  A. Volyar,et al.  Generation of singular beams in uniaxial crystals , 2003 .

[23]  M. Vasnetsov,et al.  Laser beams with screw dislocations in their wavefronts , 2003 .