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Spectral Hole-Burning and Related Spectroscopies: Science and Applications

Spectral Hole-Burning at Room Temperature in a Thin Film of SrFClxBr(1-x):Sm2+

Tsunenori Asatsuma, Nobuhiko Umezu, Yoshihiro Takemoto, Masahiko Kaneko

Published Jan 1, 1994• 0 citations
Publisher

Abstract

One of the most attractive features of spectral hole-burning (SHB) is the possible its application to higher-density data storage media(1,2). Since the recent successes of SHB at room temperature in Sm2+-doped materials(3-6), the possibility of their practical use has become much larger. In that sense, inorganic materials containing Sm2+ are of interest to us(7).

DOI
10.1364/shbs.1994.wd30

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Spectral Hole-Burning and Related Spectroscopies: Science and Applications•Jan 1, 1994•0 citations
One of the most attractive features of spectral hole-burning (SHB) is the possible its application to higher-density data storage media(1,2). Since the recent successes of SHB at room temperature in Sm2+-doped materials(3-6), the possibility of their practical use has become much larger. In that sense, inorganic materials containing Sm2+ are of interest to us(7).
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.
Two kinds of Sm-doped Strontium Borates, SrB 4 O 7 (STB) and SrB 6 O 10 (SHB), were prepared for the spectral hole-burning experiment. Sm 3+ -ions doped into the STB were well reduced to Sm 2+ -ions in air environment. Though partial reduction was observed in SHB, the Sm 3+ -ions successfully reduced in the subsequent X-ray irradiation (SHBX). Permanent spectral hole-burning experiments were conducted for 7 F 0 – 5 D 1 transition band of Sm 2+ -ions. The two samples STB and SHBX showed deep spectral holes at room temperature and 50 K, i.e., 40 and 72% of hole depths in STB and SHBX at 50 K, respectively. The STB showed type I hole-burning properties and SHBX type II. The spectral holes were sustained for over 24 h at room temperature. Multiple holes were burnt in an inhomogeneously broadened band to demonstrate the optical data storage in the frequency domain.
Persistent spectral hole burning (PSHB) is expected to be a mechanism for future ultrahigh density multi-wavelength optical memory whose density can be higher than the conventional optical memory by 10 to 104 times. PSHB optical memories are mainly studied for dye-doped polymers, but the hole burning temperatures for such poleymers are limited to tempertures lower than 140 K [1], Recently room-temperature PSHB has been observed in Sm2+ doped halide crystals [2-4] and glasses [5], and borate glasses [6]. The halide crystals are not bulk single crystals but polycrystals.
Summary form only given. Persistent spectral hole burning (PSHB) of rare-earth-doped inorganic materials has attracted much attention in view of application to high-density optical memories. In particular, it seems that the glass materials are advantageous for application in wavelength-selective optical devices, as well as the memory devices, because of their large inhomogeneous linewidth. The wavelength-selective devices are key components in the wavelength-division multiplexing system, which is important for the next-generation optical communication technology. The problem for practical application lies in the fact that PSHB of rare-earth ions in glasses is usually observed only at temperature below 20 K. However, room-temperature PSHB has been observed recently for Sm/sup 2+/-doped crystals and glasses.
Recently, the interests in optical memory based on persistent spectral hole burning (PSHB) are increased because of its possibility of the application to high density optical memory. PSHB was observed for an organic dye doped in polymer and rear earth or transition metal doped in inorganic crystal or glasses up to now. Since PSHB was observed by two Russian groups (Gorokhovskii et al. and Kharlamov et al.) for free base phthalocyanine in a n-octane Shpol'skii matrix1 and for perylene and 9-aminoacridine molecules in glassy ethanol matrix2, PSHB materials are studied primarily for the polymer doped with an organic dye. But such materials can make hole only at very low temperature. Room temperature PSHB phenomena were observed on Sm2+ doped fluoride crystals3-5 and glasses6 recently, however these materials' Гih(inhomogeneous line width)/Гh(homogeneous line width)'s which are the parameters of data multiplicity in PSHB optical memory are an order of unity. For the application of PSHB materials to optical memory, high operating temperature, high Гih/Гh, and rapid reaction rate are wanted. Glass has a superiority on the view point of optical memory application because of its broad inhomogeneous line width and productivity. Our group has discovered room temperature PSHB for Sm2+ in borate glass systems whose Гih/Гh is 24.7 PSHB for rear earth metal in glass matrix has not been studied seriously, yet. It is thought that the study of the relationship between the optical hole and glass structure is necessary.