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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 7 — Mar. 26, 2012
  • pp: 7792–7806

Decelerating a pulsed subsonic molecular beam by a quasi-cw traveling optical lattice

Xiang Ji, Qi Zhou, Zhenxing Gu, and Jianping Yin  »View Author Affiliations

Optics Express, Vol. 20, Issue 7, pp. 7792-7806 (2012)

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We propose a promising scheme to realize the deceleration of a pulsed subsonic molecular beam by using a multistage optical Stark decelerator (i.e., a 1D quasi-cw traveling optical lattice), which is composed of two nearly counter-propagating, time-varying, red-detuned light fields with an intensity of ~107Wcm−2 and a fixed frequency difference between them. We also study the influence of the velocity reduced amount of the traveling lattice, the lattice power, the synchronous phase angle, the deceleration-stage number and the temporal profile of laser pulses on the molecular slowing results by using 3D Monte-Carlo method. Our study shows that the proposed decelerator cannot only be used to slow a pulsed subsonic beam from 240m/s to standstill, but also to obtain a cold molecular packet with a temperature of a few µK, and the corresponding fraction of cold molecules is 10−6-10−7, which strongly depends on the synchronous phase angle. And we also find that a pair of appropriate rising and falling times of laser pulses will lead to a better slowing effect than that produced by the top-hat temporal ones.

© 2012 OSA

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(020.6580) Atomic and molecular physics : Stark effect
(020.7010) Atomic and molecular physics : Laser trapping
(020.3320) Atomic and molecular physics : Laser cooling

ToC Category:
Atomic and Molecular Physics

Original Manuscript: December 20, 2011
Revised Manuscript: March 8, 2012
Manuscript Accepted: March 16, 2012
Published: March 21, 2012

Xiang Ji, Qi Zhou, Zhenxing Gu, and Jianping Yin, "Decelerating a pulsed subsonic molecular beam by a quasi-cw traveling optical lattice," Opt. Express 20, 7792-7806 (2012)

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