Persistent Spectral Hole-Burning

Koji Fujita, Katsuhisa Tanaka, Kazuyuki Hirao +1 more

Persistent spectral hole burning has been observed at 77 K, 180 K, and room temperature for Eu(3+) in sodium aluminosilicate glass melted under a reducing atmosphere. In particular, room-temperature persistent spectral hole burning is reported for the first time to our knowledge in Eu(3+) -doped materials. The persistent hole is accompanied by no antiholes and lasts for 1 h at least. The thermal stability of the hole is greater than that of a persistent hole burned for Eu(3+) in sodium aluminosilicate glass melted in air.

Urs P. Wild, Alois Renn

Kimihiko Hirao

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.

W. E. Moerner

W. Vogel, D.‐G. Welsch, B. Wilhelmi

R. Bauer, T. Attenberger, Ilmo Sildos +2 more

In different color centers of neutron- irradiated and annealed sapphire crystals persistent spectral holes could be burned which were thermoresistant up to 670K [1]. In the 755.6nm zero-phonon line (ZPL) two-color photon-gated persistent spectral hole-burning (PSHB) was obtained with pulsed dye-lasers [2]. Preliminary results of PSHB with a cw laser were reported for the 462.5nm ZPL [3]. The present study concerns a investigation of PSHB with cw-lasers in different ZPL, including the 755.6nm ZPL, which is interesting for potential applications in particular because diode lasers are available in this spectral range.