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Analysis of a TE011 mode composite sapphire-rutile dielectric resonator has been carried out to study the temperature variation of resonance
frequency, close to the Cs atomic clock hyperfine frequency of 9.192 GHz. The complementary behavior of dielectric permittivity
with temperature of the composite has been exploited to obtain the desired turning point in the resonant frequency. The frequency
of the composite structure is found to be independent of the shield diameter beyond four times the puck diameter. 相似文献
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Andrew Pelter James A. Ballantine Peter Murray-Rust Victor Ferrito Alexander F. Psaila 《Tetrahedron letters》1978,19(21):1881-1884
The structure of anhydrobonellin (II) has been proposed by spectroscopic techniques and confirmed by single crystal X-ray diffraction. The relationship of (II) to bonellin is clear and thus the structure of bonellin is certain. 相似文献
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Andrew Pelter Anthony Abela-Medici James A. Ballantine Victor Ferrito Stephen Ford Victor Jaccarini Alexander F. Psaila 《Tetrahedron letters》1978,19(23):2017-2020
A series of compounds in which amino-acids are conjugated to the C-17c carbonyl group of bonellin have been obtained from the body wall of . 相似文献
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Beecher SJ Thomson RR Reid DT Psaila ND Ebrahim-Zadeh M Kar AK 《Optics letters》2011,36(23):4548-4550
A novel technique was used to control the spatial overlap of the orthogonal linearly polarized waveguide modes in ultrafast laser inscribed BiB(3)O(6) waveguides. We report that the strain fields induced by the expansion of material in the laser focus can be considered independently in the design of "type II" waveguides guiding orthogonal linearly polarized light. The waveguide with the optimal mode overlap was used for type I birefringently phase-matched second-harmonic generation of a continuous wave laser source at 1047 nm. 相似文献
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A. Benayas W. F. Silva A. R��denas C. Jacinto J. V��zquez?de?Aldana F. Chen Y. Tan R. R. Thomsom N. D. Psaila D. T. Reid G. A. Torchia A. K. Kar D. Jaque 《Applied Physics A: Materials Science & Processing》2011,104(1):301-309
We report the improvement of ultrafast laser written optical waveguides in Yb:YAG ceramics by tailoring the presence of heat accumulation effects. From a combination of ytterbium micro-luminescence and micro-Raman structural analysis, maps of lattice defects and stress fields have been obtained. We show how laser annealing can strongly reduce the concentration of defects and also reduce compressive stress, leading to an effective 50% reduction in the propagation losses and to more extended and symmetric propagation modes. 相似文献