The influence of temperature on the spectral composition and luminescence intensity of oxyfluoride glasses containing molecular clusters of silver and ions of the rare-earth metals samarium and terbium has been investigated. It is shown that introducing these ions into the composition of the glass increases the luminescence intensity of the molecular clusters of silver and the temperature sensitivity of their luminescence intensity. In oxyfluoride glass with molecular clusters of silver and Tb 3 ions, the overall luminescence intensity in the 20°C-250°C temperature range is attenuated by a factor of 50. It is shown that molecular clusters of silver are characterized by temperature sensitivity of the luminescence intensity in the range 0.045-0.099 dB∕°C.OCIS codes: (160.2540) Fluorescent and luminescent materials; (160.5690) Rare-earth-doped materials; (280.4788) Optical sensing and sensors. http://dx.
The experimental results presented here show that the use of luminescent multimode fibers in sensors of the refractive index of the ambient medium makes it possible to substantially increase their sensitivity to variation of the medium's refractive index. Experiments have been carried out with fibers made from silicate glass containing luminescent centers in the form of neutral molecular clusters of silver. The sensitivity is increased because more high-order modes are excited when the fiber captures the radiation of luminescent centers in the fiber than when the waveguide modes are excited through the ends of the fiber. The results of numerical modelling show that the sensitivity is appreciably increased for modes with index N ≥ 100.
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