Influence of impurity ions on nonlinear coloration of alkali-silicate glasses

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:552027

Efimov, O M; Matveev, Yu A; Mekryukov, A M ^[1]

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1. Scientific Research Institute for Complex Testing of Optoelectronic Devices, St. Petersburg (Russian Federation)

A study was made of the role of iron impurity ions in the formation and decay of color centers in alkali-silicate glasses under conditions of multiphoton absorption of laser radiation. An investigation was carried out on sodium-silicate glasses which are typical representatives of crown glasses. In the experiments the glasses of the Na{sub 2}O : CaO : SiO{sub 2} = 22 : 3 : 75 % compositions synthesized from materials of the {open_quote}specialty pure{close_quote} grade were used. The impurity was introduced in the form of the compound Fe{sub 2}O{sub 3} in amounts of 0.1 % by weight into some of the samples. Oxidative conditions during synthesis ensured that the main part of the iron ions in the glasses was in the form of Fe{sup 3+}. Since the band gap of alkali-silicate glasses is {approximately} 6 eV, the third and fourth harmonics of a neodymium laser were used for nonlinear coloration of these glasses. It was shown that an increase in the concentration of Fe{sub 2}O{sub 3} enhanced the residual absorption by stable hole color centers and reduced considerably the lifetime of unstable electron color centers. Repeated irradiation of the glasses containing a small amount of the impurity increased the residual absorption, whereas the induced absorption (measured immediately after the action of a radiation pulse) did not change from one pulse to the next and was governed solely by the radiation irradiance. An increase in the Fe{sub 2}O{sub 3} concentration destroyed this effect.

• Research Organization: International Society for Optical Engineering, Washington, DC (United States)
• OSTI ID: 552027
• Report Number(s): CONF-9510106--Vol.2714
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CALCIUM OXIDES
COLOR CENTERS
ENERGY ABSORPTION
GLASS
IMPURITIES
IRON IONS
LASER RADIATION
MULTI-PHOTON PROCESSES
NONLINEAR PROBLEMS
PARAMETRIC ANALYSIS
SILICON OXIDES
SODIUM OXIDES