Very low threshold whispering-gallery-mode microsphere laser
Vahid Sandoghdar(École Normale Supérieure - PSL), François Treussart(Laboratoire Kastler Brossel), J. Hare(École Normale Supérieure - PSL), V. Lefèvre-Seguin(École Normale Supérieure - PSL), J. M. Raimond(École Normale Supérieure - PSL), S. Haroche(École Normale Supérieure - PSL)
Cited by 492
Abstract
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.
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