Abstract

We experimentally created a femtosecond optical vortex using a pair of computer-synthesized holographic gratings arranged in a 2f - 2f optical setup. We present measurements showing that the resulting donut mode is free of spatial chirp, and support this finding with an analysis of the optical wave propagation through our system based on the Kirchhoff-Fresnel diffraction integral. An interferogram confirms that our ultrashort vortex has topological charge 1, and a conservative experimental estimation of its duration is 280 fs. We used 25-fs radiation pulses (bandwidth approximately 40 nm) produced by a Ti:sapphire laser oscillator.

© 2005 Optical Society of America

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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  12. see for instance E. Hecht, Optics (Addison Wesley Longman, Reading, MA, 1998).
  13. see <a href="http://www.corning.com">http://www.corning.com</a>
  14. B. J. Pearson, J. L. White, T. C. Weinacht, and P. H. Bucksbaum, �??Coherent control using adaptive learning algorithms,�?? Phys. Rev. A 63, 063412 (2001).
    [CrossRef]

J. Mod. Opt. (1)

J. Arlt, K. Dholakia, L. Allen, and M.J. Padgett, �??The production of multiringed Laguerre-Gaussian modes by computer-generated holograms,�?? J. Mod. Opt. 45, 1231�??1237 (1998).

Math. Phys. Sc. (1)

J.F. Nye and M.V. Berry, �??Dislocation in wave trains,�?? Proc. Roy. Soc. London, Ser. A, Math. Phys. Sc. 336, 165�??190 (1974).

Opt. Lett. (2)

Phys. Rev. A (3)

B. J. Pearson, J. L. White, T. C. Weinacht, and P. H. Bucksbaum, �??Coherent control using adaptive learning algorithms,�?? Phys. Rev. A 63, 063412 (2001).
[CrossRef]

L. Allen, M.W. Beijersbergen, R.J.C. Spreeuw, and J.P. Woerdman, �??Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes,�?? Phys. Rev. A 45, 8185�??8189 (1992).

D.N. Fittinghoff, P.R. Bolton, B. Chang, and K.C. Kulander, �??Polarization dependence of tunneling ionization of helium and neon by 120-fs pulses at 614 nm,�?? Phys. Rev. A 49, 2174�??2177 (1994).
[CrossRef]

Phys. Rev. Lett. (1)

P. B. Corkum, �??Plasma perspective on strong field multiphoton ionization,�?? Phys. Rev. Lett. 71, 1994�??1997 (1993).
[CrossRef]

Pis???ma Zh. Eksp. Teor. Fiz. (1)

V.Yu. Bazhenov, M.V. Vasnetsov, and M.S. Soskin, �??Laser beams with screw dislocations in their wavefronts,�?? Pis�??ma Zh. Eksp. Teor. Fiz. 52, 1037�??1039 (1990).

Other (5)

A. Scrinzi and H. G. Muller, �??Attosecond pulses: generation, detection, and applications,�?? in Strong Field Physics, T. Brabec and H.C. Kapteyn, eds. (Springer 2004).

A.E. Siegman, Lasers (University Science Books, Sausalito, CA, 1986).

C.P. Smith, R.G. McDuff, N.R. Heckenberg, M.S. Soskin, and M.V. Vasnetsov, �??Experimental realization and detection of optical vortices,�?? in Optical Vortices (Vol. 228 Horizons in World Physics), M. Vasnetsov and K. Staliunas, eds. (Nova Science, Commack, NY, 1999).

see for instance E. Hecht, Optics (Addison Wesley Longman, Reading, MA, 1998).

see <a href="http://www.corning.com">http://www.corning.com</a>

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