Speaker
Description
Using donut laser beams for atom trapping has the great advantage to reduce the residual absorption of the atoms and then the residual heating. Such traps allow to keep the atoms for a long time, which is important for many applications like Bose-Einstein condensation, or quantum simulation.
For such traps, blue-detuned single-ring Laguerre-Gaussian (LG) modes have been a lot experienced for 3D-traps, for dipole guides or for Bose-Einstein condensates [1-6], because of their relevant properties (propagation through optical element, intensity shape at the centre, …). In addition, they are easily generated by applying a helical phase on a Gaussian mode. But, a so-produced beam has a moderate finesse (thickness divided by radius is about 1) and a large laser power is then required to generate a deep trap.
A perfect optical vortex (POV) is a very thin ring of light (a delta function) [7], and appears as a good candidate for trapping.
We report on our experimental realisation of POV (a compact and versatile holographic method), providing finesses up to 20. We discuss how such donut lasers can be relevant for atom trapping, especially in case of energy constraints, like inside a cryostat.
In addition, we have generated open POV, dashed POV and dotted POV. Open POV could permit to exit the atoms from a POV. With red-detuned laser, open POV could provide a linear thin trap and, dashed and dotted POV could provide traps placed on a circle.
[1] T. Kuga, Yoshio Torii, N. Shiokawa, T. Hirano, Y. Shimizu and H.Sasada, Phys. Rev. Lett. 78, 4713, 1997
[2] F. K. Fatemi and M. Bashkansky, Opt. Express 14, 1368 (2006)
[3] M. Mestre, F. Diry, B. Viaris de Lesegno, L. Pruvost, Eur. Phys Journal D 57, 87 (2010)
[4] V. Carrat, C. Cabrera-Gutierrez, M. Jacquey, J.W. Tabosa, B. Viaris de Lesegno, L. Pruvost, Opt. Lett. 39, 719 (2014)
[5] A. Jaouadi, N. Gaaloul, B. Viaris de Lesegno, M. Telmini, L. Pruvost, E. Charron Phys. Rev. A 82, 023613 (2010)
[6] A. L. Gaunt, T. F. Schmidutz, I. Gotlibovych, R. P. Smith, and Z. Hadzibabic, Phys. Rev. Lett. 110, 200406 (2013)
[7] A. S. Ostrovsky, C. Rickenstorff-Parrao, V. Arrizon, Opt. Lett. 38, 534, (2013)
