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Conference on Lasers and Electro-Optics

Vortex-beam-induced lensing of off-resonance probe beam in Rb vapor

Andrew G. Truscott, M. E. J. Friese, Halina H. Rubinsztein-Dunlop, N. R. Heckenberg

Published Nov 27, 2002• 0 citations
Publisher

Abstract

Summary form only given.We investigate nonlinear optical effects in an atomic gas with a LG/sub 03/ donut beam. The LG/sub 03/ donut beam was produced with a Ti:sapphire laser using a computer-generated hologram. The nonlinear medium was Rb atomic vapor in a cylindrical Pyrex cell 10 cm long and 2.5 cm in diameter, heated to approximately 120 C. The power of the donut beam at the cell window was 450 mW. By tuning the laser frequency close to the Rb atomic D/sub 2/ line at 780.1 nm, we obtained resonant enhancement of the nonlinearity. As the laser frequency was tuned through the Rb D/sub 2/ line, we could monitor self-focusing and defocusing on either side of the atomic transition.

DOI
10.1109/iqec.1998.680510

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Summary form only given.We investigate nonlinear optical effects in an atomic gas with a LG/sub 03/ donut beam. The LG/sub 03/ donut beam was produced with a Ti:sapphire laser using a computer-generated hologram. The nonlinear medium was Rb atomic vapor in a cylindrical Pyrex cell 10 cm long and 2.5 cm in diameter, heated to approximately 120 C. The power of the donut beam at the cell window was 450 mW. By tuning the laser frequency close to the Rb atomic D/sub 2/ line at 780.1 nm, we obtained resonant enhancement of the nonlinearity. As the laser frequency was tuned through the Rb D/sub 2/ line, we could monitor self-focusing and defocusing on either side of the atomic transition.
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We report steady-state self-focusing, self-trapping, and self-defocusing of a cw dye laser beam in sodium vapor for frequencies within several Doppler widths of the DDD-line resonance transitions. We measured the variation of the beam profile as the light propagates through the vapor. We observed a 20-mW beam self-trapped in a 12-cm-long filament having a half-power diameter of 70 \ensuremath{\mu}m.
We report steady-state self-focusing, self-trapping, and self-defocusing of a cw dye laser beam in sodium vapor for frequencies within several Doppler widths of the DDD-line resonance transitions. We measured the variation of the beam profile as the light propagates through the vapor. We observed a 20-mW beam self-trapped in a 12-cm-long filament having a half-power diameter of 70 \ensuremath{\mu}m.
We present, experimentally and theoretically, nonlinear magneto-optical rotation (NMOR) using two spatially separated laser beams, the pump laser beam for creation and the probe laser beam for detection of the coherence between ground Zeeman sublevels. Both pump and probe lasers are tuned to ${F}_{g}=2\ensuremath{\rightarrow}{F}_{e}=1$ transition in 87Rb^{87}\text{R}\text{b}87Rb. With the specially designed spatial configuration of the pump and the probe beams we were able to obtain dispersively shaped probe laser NMOR resonances in the Rb vacuum gas cell. The theory indicates that the obtained line shapes are due to the interference between prepared atomic states and the probe laser field. The interference nature of the resonances is supported by narrowing of NMOR resonances with increased separation between laser beams, and by the shift of the central fringe from the zero magnetic field with increased angle between initial orientation of electric vectors of linearly polarized pump and probe beams.