Measuring The Topological Charge Of Ultra-broadband, Optical-vortex Beams With A Triangular Aperture

A technique for determining the topological charge of supercontinuum optical vortices is presented. Spatial dispersion is compensated with a unique double-pass arrangement, and charge is consistently measured across a wide range of colors by observing diffraction through a triangular aperture. © OSA 2012.Bezuhanov, K., Dreischuh, A., Paulus, G.G., Schätzel, M.G., Walther, H., Vortices in femtosecond laser fields (1944) Opt. Lett., 29, pp. 1942-1944Mariyenko, I.G., Strohaber, J., Uiterwaal, C.J.G.J., Creation of optical vortices in femtosecond pulses (7608) Opt. Exp., 13, pp. 7599-7608Bezuhanov, K., Dreischuh, A., Paulus, G.G., Schätzel, M.G., Walther, H., Neshev, D., Królikowski, W., Kivshar, Y., Spatial phase dislocations in femtosecond laser pulses (2006) J. Opt. Soc. Am. B, 23, pp. 26-35Zeylikovich, I., Sztul, H.I., Kartazaev, V., Le, T., Alfano, R.R., Ultrashort Laguerre-Gaussian pulses with angular and group velocity dispersion compensation (2027) Opt. Lett., 32, pp. 2025-2027Hickmann, J.M., Fonseca, E.J.S., Soares, W.C., Chavez-Cerda, S., Unveiling a Truncated Optical Lattice Associated with a Triangular Aperture Using Light's Orbital Angular Momentum (2010) Phys. Rev. Lett., 105, p. 053904De Araujo, L.E.E., Anderson, M.E., Measuring vortex charge with a triangular aperture (2011) Opt. Lett., 36, pp. 787-78