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Proceedings Paper

Studies on the crystallisation behaviour of erbium doped phosphate glasses
Author(s): N. Prasad; B. Richards; M. Marshall; R. Ireson; M. Glendenning; A. Jha
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Paper Abstract

Phosphate glasses can dissolve high concentrations of rare earths and have excellent spectroscopic properties making them useful solid-state laser materials. Solid-state lasers doped with different rare-earth ions find applications in a wide range of LIDAR (Light Detection and Ranging) and sensing applications; phosphate glasses are useful host materials for many applications in the visible and near-infrared spectral regions. For example, trivalent erbium (Er3+) doped phosphate glasses operate at the eye-safe wavelength of 1.54 μm and are used for range finding and sensing applications. Tm3+ doped solid-state lasers operating at ~ 2 μm can be used for wind-shear and turbulence monitoring. Similarly, Nd-doped metaphosphate glasses are the preferred gain medium for high-peak-power lasers used for fusion energy research because they can store optical energy at greater densities than other glass-types and can be fabricated in large sizes with high rare-earth ion concentration. This paper discusses issues affecting glass quality, with particular focus on defect formation, especially crystallisation. Avoiding crystallisation during processing is essential to form high quality laser cavities. The work presented explores some of the factors controlling these defects including contamination during melting. The crystallisation behaviour of the glass was investigated for several different phosphate glass compositions and different melting conditions, including melting duration, temperature and crucible material.

Paper Details

Date Published: 1 November 2012
PDF: 7 pages
Proc. SPIE 8534, Remote Sensing of Clouds and the Atmosphere XVII; and Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing VIII, 853418 (1 November 2012); doi: 10.1117/12.981715
Show Author Affiliations
N. Prasad, Glass Technology Services (United Kingdom)
Univ. of Leeds (United Kingdom)
B. Richards, Univ. of Leeds (United Kingdom)
M. Marshall, Glass Technology Services (United Kingdom)
R. Ireson, Glass Technology Services (United Kingdom)
M. Glendenning, Glass Technology Services (United Kingdom)
A. Jha, Univ. of Leeds (United Kingdom)


Published in SPIE Proceedings Vol. 8534:
Remote Sensing of Clouds and the Atmosphere XVII; and Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing VIII
Upendra N. Singh; Gelsomina Pappalardo; Evgueni I. Kassianov; Adolfo Comeron; Richard H. Picard; Klaus Schäfer, Editor(s)

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