Cavity-enhanced effects with silica microspheres immersed in superfluid helium

Valerie Lefevre-Seguin; F. Treussart; Vladimir S. Ilchenko; Jean-Francois Roch; Jean Hare; J.-M. Raimond; Serge Haroche

doi:10.1117/12.340110

25 February 1999 Cavity-enhanced effects with silica microspheres immersed in superfluid helium

Valerie Lefevre-Seguin, F. Treussart, Vladimir S. Ilchenko, Jean-Francois Roch, Jean Hare, J.-M. Raimond, Serge Haroche

Proceedings Volume 3736, ICONO '98: Quantum Optics, Interference Phenomena in Atomic Systems, and High-Precision Measurements; (1999) https://doi.org/10.1117/12.340110
Event: ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, 1998, Moscow, Russian Federation

Abstract

Silica microspheres behave as efficient optical microresonators when small-volume whispering-gallery modes (WGMs) are used. We have realized a cryogenic set-up to work with microspheres immersed in a superfluid helium bath. Quality factors up to 10⁹ have been obtained at 2 K. In this environment, we have been able to observe a dispersive bistable behavior of the WGM resonances, due to the weak intrinsic Kerr optical nonlinearity of silica, with a threshold power of 10 (mu) W only. This result opens the way to the realization of thresholdless microlaser, based on a rare-earth doped silica microsphere and to other Cavity-QED projects with microspheres at low temperatures.

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Valerie Lefevre-Seguin, F. Treussart, Vladimir S. Ilchenko, Jean-Francois Roch, Jean Hare, J.-M. Raimond, and Serge Haroche "Cavity-enhanced effects with silica microspheres immersed in superfluid helium", Proc. SPIE 3736, ICONO '98: Quantum Optics, Interference Phenomena in Atomic Systems, and High-Precision Measurements, (25 February 1999); https://doi.org/10.1117/12.340110

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KEYWORDS

Optical spheres

Silica

Helium

Prisms

Bistability

Cryogenics

Refractive index

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