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Phys Rev Lett. 2003 Jul 25;91(4):043902. Epub 2003 Jul 22.

Ideality in a fiber-taper-coupled microresonator system for application to cavity quantum electrodynamics.

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Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA.


The ability to achieve near lossless coupling between a waveguide and a resonator is fundamental to many quantum-optical studies as well as to practical applications of such structures. The nature of loss at the junction is described by a figure of merit called ideality. It is shown here that under appropriate conditions ideality in excess of 99.97% is possible using fiber-taper coupling to high-Q silica microspheres. To verify this level of coupling, a technique is introduced that can both measure ideality over a range of coupling strengths and provide a practical diagnostic of parasitic coupling within the fiber-taper-waveguide junction.

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