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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 19, Iss. 6 — Jun. 1, 2002
  • pp: 1233–1238

Optimized single-beam dark optical trap

Ariel Kaplan, Nir Friedman, and Nir Davidson  »View Author Affiliations


JOSA B, Vol. 19, Issue 6, pp. 1233-1238 (2002)
http://dx.doi.org/10.1364/JOSAB.19.001233


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Abstract

We propose a new scheme for constructing a single-beam dark optical trap that minimizes light-induced perturbations of the trapped atoms. The proposed scheme optimizes the trap depth for given trapping laser power and detuning by creating a light envelope with (a) an almost minimal surface area for a given volume and (b) the minimal wall thickness that is allowed by diffraction. The stiffness of the trap’s walls, combined with the large detuning allowed by the efficient distribution of light intensity, yields a low spontaneous photon scattering rate for the trapped atoms. Our trap also optimizes the loading efficiency by maximizing the geometrical overlap between a magneto-optical trap and the dipole trap. We demonstrate this new scheme by generating the proposed light distribution of a single-beam dark trap with a trap depth that is ~33 times larger than that of existing blue-detuned traps and ~13 times larger than that of a red-detuned trap with the same diameter, detuning, and laser power. Trapped atoms are predicted to have a decoherence rate that is >200 times smaller than in existing single-beam dark traps and ~1800 times smaller than in a red-detuned trap with the same diameter, depth, and laser power.

© 2002 Optical Society of America

OCIS Codes
(020.7010) Atomic and molecular physics : Laser trapping
(050.1380) Diffraction and gratings : Binary optics

Citation
Ariel Kaplan, Nir Friedman, and Nir Davidson, "Optimized single-beam dark optical trap," J. Opt. Soc. Am. B 19, 1233-1238 (2002)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-19-6-1233


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References

  1. N. Davidson, H. J. Lee, C. S. Adams, M. Kasevich, and S. Chu, “Long atomic coherence times in an optical dipole trap,” Phys. Rev. Lett. 74, 1311–1314 (1995).
  2. R. Grimm, M. Weidemuller, and Y. B. Ovchinnikov, “Optical dipole traps for neutral atoms,” Adv. At., Mol., Opt. Phys. 42, 95–170 (2000).
  3. S. Chu, J. E. Bjorkholm, A. Ashkin, and A. Cable, “Experimental observation of optically trapped atoms,” Phys. Rev. Lett. 57, 314–317 (1986).
  4. H. J. Lee, C. S. Adams, M. Kasevich, and S. Chu, “Raman cooling of atoms in an optical dipole trap,” Phys. Rev. Lett. 76, 2658–2661 (1996).
  5. Yu. B. Ovchinnikov, I. Manek, A. I. Sidorov, G. Wasik, and R. Grimm, “Gravito-optical atom trap based on a conical hollow beam,” Europhys. Lett. 43, 510–515 (1998).
  6. T. Kuga, Y. Torii, N. Shiokawa, and T. Hirano, “Novel optical trap of atoms with a doughnut beam,” Phys. Rev. Lett. 78, 4713–4716 (1997).
  7. R. Ozeri, L. Khaykovich, and N. Davidson, “Long spin relaxation times in a single-beam blue-detuned optical trap,” Phys. Rev. A 59, R1750–R1753 (1999).
  8. R. Ozeri, L. Khaykovich, N. Friedman, and N. Davidson, “Large-volume single-beam dark optical trap for atoms using binary phase elements,” J. Opt. Soc. Am. B 17, 1113–1116 (2000).
  9. 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 (R) (2000).
  10. L. Khaykovich, N. Friedman, S. Baluschev, D. Fathi, and N. Davidson, “Ultrasensitive two-photon spectroscopy based on long spin-relaxation time in a dark optical trap,” Europhys. Lett. 50, 454–459 (2000).
  11. V. Milner, J. L. Hanssen, W. C. Campbell, and M. G. Raizen, “Optical billiards for atoms,” Phys. Rev. Lett. 86, 1514–1517 (2001).
  12. N. Friedman, A. Kaplan, D. Carasso, and N. Davidson, “Observation of chaotic and regular dynamics in atom-optics billiards,” Phys. Rev. Lett. 86, 1518–1521 (2001).
  13. S. J. M. Kuppens, K. L. Corwin, K. W. Miller, T. E. Chupp, and C. E. Wieman, “Loading an optical dipole trap,” Phys. Rev. A 62, 013406 (2000).
  14. K. M. O’Hara, S. R. Granade, M. E. Gehm, and J. E. Thomas, “Loading dynamics of CO2 laser traps,” Phys. Rev. A 63, 043403 (2001).
  15. C. S. Adams, H. J. Lee, N. Davidson, M. Kasevich, and S. Chu, “Evaporative cooling in a crossed dipole trap,” Phys. Rev. Lett. 74, 3577–3580 (1995).
  16. In contrast to that of a blue-detuned trap, for which the volume is clearly defined, the volume of a red-detuned trap is ambiguous. We choose a conservative criterion by identifying the trap’s dimension with the distance between the 1/e2 points of the potential.
  17. J. Arlt and M. J. Padgett, “Generation of a beam with a dark focus surrounded by regions of higher intensity: the optical bottle beam,” Opt. Lett. 25, 191–193 (2000).
  18. The smallest ratio of surface area to enclosed volume is of course achieved for a sphere. Our trap generates a dark volume surrounded by two cones attached at their bases. If the height of the cones is equal to their base radius, this ratio is only 6 2 times larger (~12%).
  19. Yu. B. Ovchinnikov, I. Manek, and R. Grimm, “Surface trap for Cs atoms based on evanescent-wave cooling,” Phys. Rev. Lett. 79, 2225–2228 (1997).
  20. J. W. Goodman, Introduction to Fourier Optics, 2nd. ed. (McGraw-Hill, New York, 1996), Chap. 7.
  21. Two exceptions are z=0, where the +1 and −1 orders overlap, yielding a double potential height, and z≈L, where the singularity of (L−z)−1 in Eq. (3) yields extremely high potentials.
  22. K. Gibble and S. Chu, “Laser-cooled Cs frequency standard and a measurement of the frequency shift due to ultracold collisions,” Phys. Rev. Lett. 70, 1771–1774 (1993).
  23. K. Sasaki, M. Koshioka, H. Misawa, N. Kitamura, and H. Masuhara, “Optical trapping of a metal particle and a water droplet by a scanning laser beam,” Appl. Phys. Lett. 60, 807–809 (1992).

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