Long-lasting phosphorescence and photostimulated long-lasting phosphorescence in Mn 2+ -doped alumino-phosphofluoride gl
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Youyu Fan and Hefang Hu Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China
Congshan Zhu Photon Craft Project, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences and Japan Science and Technology Corporation, Shanghai 201800, People’s Republic of China (Received 28 August 2002; accepted 9 December 2002)
We report on long-lasting phosphorescence and photostimulated long-lasting phosphorescence phenomena in femtosecond laser-irradiated Mn2+-doped alumino-phosphofluoride glasses. Long-lasting phosphorescence was observed in the glass samples after the irradiation of the focused femtosecond laser. Photostimulated long-lasting phosphorescence was observed in the femtosecond laser pre-irradiated region by excitation of an ultraviolet light of 365 nm, after the femtosecond laser-induced long-lasting phosphorescence decayed completely. The mechanisms of these phenomena have been discussed. These phenomena have potential uses in three-dimensional ultra-high-density optical recording.
I. INTRODUCTION
The intensity of a focused femtosecond laser can reach as high as 1014 W/cm2 because of the ultra-short pulse width of the femtosecond laser. This intensity is sufficient for inducing various nonlinear optical effects in glasses, such as multiphoton absorption and multiphoton ionization, etc. Therefore, the femtosecond laser can be used for space-selective modification of structure in transparent materials. The femtosecond laser can also be used in high precise processing because less heat is generated in the materials under irradiation of the femtosecond laser than using a nanosecond or picosecond laser. Davis et al. and Miura et al. fabricated permanent wave guides in various bulk glasses by using a femtosecond laser.1,2 Mazur et al. performed experiments using femtosecond-laser-induced damage to record the information inside glasses.3 Qiu et al. observed femtosecond-laser-induced photo reduction of rare-earth ions and femtosecond-laser-induced longlasting phosphorescence in glasses.4–7 Therefore, the femtosecond laser allows new possibilities in micromodification of transparent dielectric materials to acquire novel functional microstructures with different applications. 616
http://journals.cambridge.org
J. Mater. Res., Vol. 18, No. 3, Mar 2003 Downloaded: 11 Mar 2015
The long-lasting phosphorescence phenomenon has been observed in rare-earth-doped silicate, fluorophosphates, and fluoride glass samples,5 as well as in Mn2+doped sodium borate glass samples.8 However, there are no reports to date on the same phenomenon in the Mn2+-doped alumino-phosphofluoride glasses. In this paper, we report the phenomenon of femtosecond laserinduced long-lasting phosphorescence and a new phenomenon of photostimulated long-lasting phosphorescence in Mn2+-doped alumino-phosphofluoride glasses. The possible mechanisms of the observed phenomena are discussed.
II. EXPERIMENTAL
The composition of the glass sample was 35AlF3, 20CaF2, 15YF3, 10MgF2,
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