K. N. Boldyrev, M. Diab, N. M. Khaidukov, M. N. Popova
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Abstract
The luminescence spectra of the K2YF5:Er3+ (0.5 at %) were recorded in the spectral regions of the intermultiplet transitions 4I13/2 → 4I15/2 (region of about 1.5 μm, falling within the transparency window of a standard optical fiber) and 4I11/2 → 4I15/2 (region of about 0.98 μm) with high spectral resolution at different temperatures. Pairs of spectral lines are proposed for the implementation of a Boltzmann luminescent ratiometric cryothermometer in the temperature ranges of about 20, 40, and 60 K with a relative sensitivity of 8 to 3% K–1. It is shown that measuring the half-width of a luminescence line with a wavelength of 1.538 μm (6500 cm–1) provides a simple and reliable method for recording temperatures in the range from 20 to 90 K with a relative sensitivity of 3 to 2% K–1.
期刊介绍：
Optics and Spectroscopy (Optika i spektroskopiya), founded in 1956, presents original and review papers in various fields of modern optics and spectroscopy in the entire wavelength range from radio waves to X-rays. Topics covered include problems of theoretical and experimental spectroscopy of atoms, molecules, and condensed state, lasers and the interaction of laser radiation with matter, physical and geometrical optics, holography, and physical principles of optical instrument making.
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