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Journal of Physics Condensed Matter

Persistent spectral hole burning and optical properties of Sm2+doped into Mg0.5Sr0.5FCl0.5Br0.5mixed crystal

Kiwan Jang, Il-Gon Kim, Hyo-Jin Seo, Seongtae Park, Sung-Soo Lee, Woon Sik Baek

Published Mar 15, 2001• 0 citations
Publisher

Abstract

We measured the temperature dependence of the fluorescence of Sm 2+ ions doped into a Mg 0.5 Sr 0.5 FCl 0.5 Br 0.5 mixed crystal and observed the persistent spectral hole burning at 90 K and 300 K. The electrons appearing at the 5 D 0 → 7 F 0 transition mostly come via the 4f5d→ 5 D 1 → 5 D 0 → 7 F 0 route but some of the electrons come directly from the 4f5d band. At 90 K, persistent spectral hole burning was achieved much more efficiently by the photon-gated spectral hole-burning process than by the one-photon hole-burning process, while the one-photon hole-burning process is much more efficient at 300 K.

DOI
10.1088/0953-8984/13/13/328

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We measured the temperature dependence of the fluorescence of Sm 2+ ions doped into a Mg 0.5 Sr 0.5 FCl 0.5 Br 0.5 mixed crystal and observed the persistent spectral hole burning at 90 K and 300 K. The electrons appearing at the 5 D 0 → 7 F 0 transition mostly come via the 4f5d→ 5 D 1 → 5 D 0 → 7 F 0 route but some of the electrons come directly from the 4f5d band. At 90 K, persistent spectral hole burning was achieved much more efficiently by the photon-gated spectral hole-burning process than by the one-photon hole-burning process, while the one-photon hole-burning process is much more efficient at 300 K.
A mixed crystal Sm2+-doped Mg0.5Sr0.5FCl0.5Br0.5 has a high potential in the application for a 3D optical memory. We have observed one-photon persistent spectral hole burning in this material at room temperature. The powder sample of (formula available in paper) was synthesized by firing at 1000 degrees C for 2 hours in a reducing stream of hydrogen. The product was examined with an X-ray diffractometer for the crystalline structure. Fluorescence excitation and emission spectra were recorded with a spectrofluorometer.
Materials of MyM’1-yFClxBr1-x:Sm2+ have been widely applied in spectral hole-burning since the first observation of persistent spectral hole-burning in BaFCl:Sm2+ at 2K was reported by A. Winnaker, etc. in 1985[1]. From then on, hole-burning in BaFCl0.5Br0.5:Sm2+ at 77K[2] in SrFCl and Mg0.5Sr0.5FCl0.5Br0.5:Sm2+ at room temperature[3, 4] were reported. Room temperature hole-buring of Sm2+ in fluorohafnate glasses[5,6] were reported in recent years also. These materials are of potential use in high temperature hole- burning. But comparing to organic materials, they have lower hole- burning efficiency and narrower inhomogenous line width. In order to apply spetral hole- buring in frequency domain optical storage, it is important to improve these materials.
Photon gated spectral hole-burning was first observed in a samarium doped crystal, BaFCl:Sm2+ [1]. This material was of interest to the developement of optical memories as the holes were found to be stable to room temperature thermal cycling. Holes could be burnt at liquid helium temperatures but as the temperature was raised the line quickly became homogeneously broadened. The addition of bromine to the melt succeeded in broadening the inhomogeneous linewidths to about 2 nm through substitutional disorder [2] and persistent holes were observed at 77 K [3]. Subsequently, a study of the parameters for spectral hole-burning in a BaFCl0.5Br0.5:Sm2+ crystalline powder was performed [4] and the highest temperature for which persistent hole-burning had been observed was raised to 133 K. Here we report spectral hole-burning at room temperature (figure 1) in a related compound, Sr0.5Mg0.5FCl0.5Br0.5:Sm2+.
Two-photon persistent hole burning is observed at T = 296 K in 5 D 1 – 7 F 0 and 5 D 0 – 7 F 0 transitions of Sm 2+ ions in substitutionally disordered SrFCl 1/2 single crystals, showing the ratio of inhomogeneous to homogeneous linewidth of 20 ÷ 25. The minimum hole widths of 3.5 cm -1 and 2.6 cm -1 , respectively, were determined for these transitions. In fact, the applicability of persistent spectral hole burning, known as a low-temperature high-resolution spectroscopic method and a potential basis for the use of a new–spectral–dimension in optical data storage and processing, is demonstrated for the first time at room temperature in inorganic materials.
We reported the first observation of room-temperature persistent spectral hole burning in Sm2+-doped fluoride glass in the last conference [1]. Room-temperature hole burning had been also observed in Sm2+-doped crystals [2]. We found considerable differences in the hole-burning characteristics between Sm2+-doped glasses and Sm2+-doped crystals: The burning-laser-intensity dependence is approximately linear, and no antihole is observed around the hole burned in Sm2+-doped glasses [3]. More detailed experimental studies are needed to clarify the mechanism of the hole burning in this glass and to explore more efficient hole-burning systems. In this paper, we report several experimental results related to wavelength dependence of the hole burning process.