Abstract

A design of an optical resonator for generation of a doughnutlike laser beam in the far field is proposed. The resonator consists of a toric mirror, a flat output coupler, and a w-axicon with a movable center axicon. Two-dimensional vector electric field simulation has shown that any one of the Laguerre�??Gaussian modes can be selected by sliding the center axicon. Therefore this resonator is capable of generating doughnut-like laser beams, whose dark spot size can be controlled in real time. This feature of the proposed resonator is advantageous for atom trapping and optical tweezers

© 2004 Optical Society of America

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    [CrossRef]
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Appl. Opt.

CLEO

S. M. Iftiquar, H. Ito, and M. Ohtsu, �??Tunable doughnut light beam for a near-field optical funnel of atoms,�?? Tech. Digest of the CLEO/PR01 (Institute of Electrical and Electronics Engineers, New York, 2001), pp. 34-35.

J. Phys. D

D. Ehrlichmann, U. Habich, and H. D. Plum, �??Diffusion-cooled CO2 laser with coaxial high frequency excitation and internal axicon,�?? J. Phys. D 26, 183-191 (1993).
[CrossRef]

Opt. Lett.

Phys. Rev. A

N. Friedman, L. Khaykovich, R. Ozeri, and N. Davidson, �??Compression of cold atoms to very high densities in a rotating-beam blue-detuned optical trap,�?? Phys. Rev. A 61, 031403 (2000).
[CrossRef]

Phys. Rev. Lett.

E. J. Galvez, P. R. Crawford, H. I. Sztul, M. J. Pysher, P. J. Haglin, and R. E. Williams, �??Geometric phase associated with mode transformations of optical beams bearing orbital angular momentum,�?? Phys. Rev. Lett. 90 203901 (2003).
[CrossRef]

Other

N. Hodgson and H. Weber, Optical Resonators (Springer, New York, 1997), p. 546.

N. Hodgson and H. Weber, Optical Resonators (Springer, New York, 1997), p. 168.

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