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Room temperature measurement of the anisotropic loss tangent of sapphire using the whispering gallery mode technique

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4 Author(s)
Hartnett, J.G. ; Sch. of Phys., Western Australia Univ., Crawley, WA, Australia ; Tobar, M.E. ; Ivanov, E.N. ; Krupka, J.

The anisotropic loss tangent has been determined in monocrystalline sapphire for components parallel and perpendicular to the crystal axis, using the whispering gallery (WG) mode method. The Q-factors of quasi-TE and quasi-TM modes were measured precisely in four cylindrical sapphire resonators at room temperature, from which was determined a maximum attainable Q-factor of (2.1 /spl plusmn/ 0.2) /spl times/ 10/sup 5/ at 9 GHz in a quasi-TM mode. Sapphire dielectric material from three different manufacturers was compared over the 270-345 K temperature range and the 5-16 GHz frequency range.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:53 ,  Issue: 1 )