factors up to 109 have been obtained in the whispering gallery modes (WGMs) of fused silica microspheres immersed in a superfluid helium bath. We have observed a dispersive bistable behaviour of the WGM with a threshold power of 10 μW, due to the intrinsic Kerr nonlinearity of silica. These results open way to the realization of a thresholdless microlaser and other cavity QED projects microspheres.
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Treussart et al. (1998) studied this question.
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