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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 22, Iss. 7 — Jul. 1, 2005
  • pp: 1538–1546

Collision-induced superfluorescence

A. Kumarakrishnan, Siddharaj Chudasama, and Xianming Han  »View Author Affiliations


JOSA B, Vol. 22, Issue 7, pp. 1538-1546 (2005)
http://dx.doi.org/10.1364/JOSAB.22.001538


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Abstract

We have studied superfluorescence (SF) in Ca vapor evolving on the 3d4s ^3 D_J -4s4p ^3 P_J-1 transitions at 1.9 µm by exciting the 4s^21 S_0 -4s4p ^1 P_1 with a pulsed dye laser. SF is generated following population transfer by spin-changing collisions with an inert gas Ar from the 4s4p ^1 P_1 and 3d4s ^1 D_2 levels. We show for the first time to our knowledge that the time delay for SF evolution follows the 1/sqrt N dependence expected for the case of uniform excitation of the vapor column by collisional transfer. Here, N is the number of participating atoms that was measured directly from the photon yield. The measured photon yield for the signal as a function of Ar pressure was found to be consistent with rate equations that simulate the buildup of populations in the ^3 D_J levels based on known collisional rates. This suggests that collisional rates can be directly inferred on the basis of SF photon yields and the atomic level populations. The pulse shapes for SF show temporal oscillations that depend on two distinct factors. The first is the presence of a number of independently evolving regions in the gain medium, and the second is the presence of spatial modes. Temporal ringing is a well-known effect related to the exchange of energy between the atoms and the radiation field during pulse propagation. However, the temporal ringing observed in this experiment is far more pronounced than in previous SF experiments due to a particular choice of evolution parameters. This should make it feasible to compare our results with detailed numerical simulations that have been carried out previously.

© 2005 Optical Society of America

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(020.1670) Atomic and molecular physics : Coherent optical effects
(020.2070) Atomic and molecular physics : Effects of collisions
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(270.0270) Quantum optics : Quantum optics
(270.6630) Quantum optics : Superradiance, superfluorescence

Citation
A. Kumarakrishnan, Siddharaj Chudasama, and Xianming Han, "Collision-induced superfluorescence," J. Opt. Soc. Am. B 22, 1538-1546 (2005)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-22-7-1538


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