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Phys. Rev. A 54, R1777–R1780 (1996)

Very low threshold whispering-gallery-mode microsphere laser

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V. Sandoghdar*, F. Treussart, J. Hare, V. Lefèvre-Seguin, J. -M. Raimond, and S. Haroche
Laboratoire Kastler Brossel, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France

Received 15 April 1996; published in the issue dated September 1996

We report on the realization of a whispering-gallery-mode laser based on neodymium-doped silica microspheres. Absorbed pump powers at threshold are as low as 200 nW. The linear variation of the threshold with the loss factor of the cavity mode has also been observed. We discuss the potential of this system as a permanent microlaser operating with a few active ions at liquid-helium temperature.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.54.R1777
DOI:
10.1103/PhysRevA.54.R1777
PACS:
42.55.-f, 42.60.-v

*Present address: Fakultät für Physik, Universität Konstanz, Postfach 5560 M 695, 78434 Konstanz, Germany.

 
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