Optical properties and laser demonstrations of Nd-doped sol-gel silica glasses

Thomas, Ian M.; Payne, Stephen A.; Wilke, G.D.

doi:10.1016/0022-3093(92)90028-i

Cited by 160 publications

(83 citation statements)

References 19 publications

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“…The¸e xp value of the Al-codoped glass is much larger than that of the Al-free glass because of the enhanced dispersion of Nd 3+ ions, resulting in a relatively large¯value (³0.30.4). However, thȩ exp value is not large enough, as compared with PL decay constants reported for NdAl codoped glasses (280450, 3), 4) 257425, 7) 250550, 12) 325, 14) 240250, 17) and 376¯s 27) ). It is partly because of the small z Al /z Nd value (z Al /z Nd = 1).…”

Section: Discussionmentioning

confidence: 64%

“…44) These changes are consistent with previous reports. 3) 348 360¯s 7) ) and NdAl codoped (495, 3) 485572, 7) 640, 12) 507 538, 17) and 806¯s 26) ) glasses, although the reason is currently unclear. The small¯value of the Al-free glass (³0.03) is due to the large discrepancy between the¸e xp and¸J O values.…”

Section: Discussionmentioning

confidence: 99%

“…The line strength S was independently determined for nine groups of absorption bands between 400 and 920 nm 7) employing n of undoped silica glass, 38) and was substituted into the expression for the transition from the lower level bJ 0 to the upper level aJ, …”

Section: ¹1mentioning

confidence: 99%

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Cosolvent-free sol–gel synthesis of rare-earth and aluminum codoped monolithic silica glasses

Kaneko

Kajihara

Kanamura

2013

J. Ceram. Soc. Japan

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A cosolvent-free solgel method to synthesize monolithic silica glasses containing both of rare-earth and aluminum ions has been studied. Fracture during drying and bloating during sintering are significantly suppressed by forming macroporous wet gels via macroscopic phase separation in parallel with gelation. The resultant rare-earth and aluminum codoped silica glasses exhibit good visible transparency, suggesting an improvement of dispersion of rare-earth ions in these glasses. The aluminum codoping increases the photoluminescence efficiency in glasses doped with Nd 3+ ions.

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

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Cosolvent-free sol–gel synthesis of rare-earth and aluminum codoped monolithic silica glasses

Kaneko

Kajihara

Kanamura

2013

J. Ceram. Soc. Japan

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“…Sol-gel-processed materials have been used in the area of solid-state lasers 66,67 . The sol-gel method also provides a convenient route to prepare luminescent glass optical fibres doped with rare earth ions 68,69 , waveguides 70,71 , and lasers 72 . The sol-gel technique has also been used to fabricate nonlinear, optically active composites for applications in optical telecommunications 73 .…”

Section: Development Of New Sol-gel Laser Materialsmentioning

confidence: 99%

Sol-gel Technology for Sensor Applications

Chaudhury

Gupta

Gulia

2007

DSJ

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Sol-gel processes refer to the transition of predefined compositions of inorganic alkoxides precursors from liquid sol phase to solid gel phase. The phenomenon of sol-gel was known to mankind for more than 150 years. It is because of concerted efforts of researchers from multidisciplinary fields, sol-gel science transformed to technology. Several products are already commercially available for applications in optical coatings, nanocomposites, and public healthcare. Potential applications in the areas of biosensors and environmental monitoring are expected. Newer applications with nanotechnology appear too exciting. An attempt has been made to address important applications of sol-gel technology, particularly in sensing techniques from the defence perspective.Keywords: Sol-gel technology, nanomaterials, healthcare, sensors, defence applications Revised 19 November 2006 . INTRODUCTIONThe term sol-gel was first coined in the late 1800s. It generally refers to a low-temperature method using inorganic precursors that can produce ceramics and glasses with better purity and homogeneity than through high temperature conventional processes 1 . Two most attractive features of the sol-gel process are that it can produce compositions that cannot be created with conventional methods, and that the mixing level of the solution is retained in the final product, often up to the molecular scale.Sol-gel method has been successfully used to manufacture a variety of products, viz., bulk glasses 2 , optical fibers 3 , special coatings, ultra-pure powders, and multifunctional materials. Figure 1 shows different types of materials made from sol-gels. Sol-gelprocessed transparent porous matrix offers the possibility of doping various organic and inorganic molecules [5][6][7][8] . Sol-gel process has been used to Defence Science Journal, Vol. 57, No. 3, May 2007, pp. 241-253 © 2007 241 REVIEW PAPERfabricate materials which can be used as new laser materials, nanocomposites, biomimetic systems, and so on. Because of potential in fabrication of a wide variety of new materials, understanding of sol-gel processes has become the centre of interdisciplinery research, viz., physics, chemistry, biology, biotechnology, biochemistry, electronics, and related engineering branches. Sol-gel materials have a wide range of applications, from environmental monitoring, biosensors for healthcare, to nanotechnology for sensing clinically-important analytes. . BASICS OF SOL-GEL PROCESSThe sol-gel process is a versatile technique which involves the transition of a predefined composition from liquid sol (mostly colloidal) phase into a solid gel phase 9 . Sol-gel processing involves the hydrolysis of a metal alkoxide followed by condensation and polymerisation reactions, leading to the sol-gel state.242 DEF SCI J, VOL. 57, NO. 3, MAY 2007 These general reactions are shown below:Metal alkoxides are most popular because these react readily with water. The most widely used metal alkoxides are the alkoxysilanes, such as tetramethoxysilane (TMOS) a...

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“…Hydroxyl quenching and dopant clustering are two complications that currently limit the luminescence efficiency of rare earth ions in sol-gel host materials 7,8 . Hydroxyl quenching is caused by residual water, solvents, and silanol groups present in sol-gel glasses and leads to an enhancement of non-radiative decay pathways of rare earth ions.…”

Section: Introductionmentioning

confidence: 99%