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Proceedings Paper

Ultra-broadband Raman gain media for photonics device applications
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Paper Abstract

A study was initiated to understand requirements to widen and flatten the gain coefficient spectra of tellurite-based glasses for their application as new gain media for photonic devices. Rationale of broadening was found to be generating Raman active structural elements such as WO4, MoO4 and PO4 tetrahedra in appropriate concentrations in suitable base glasses. Suitable base glass with best compromise between glass formations, optical and thermal properties were determined. Raman active WO4 and PO4 tetrahedra were generated either separately or jointly in a TeO2-Nb2O5-BaO (TNB) glass system. The Raman spectral response to this addition was studied by exciting the samples at four wavelengths, 488, 532, 633, and 785 nm. The Raman intensity and bandwidth increased when WO3 and P2O5 were jointly added in TNB. Pure non-resonant Raman gain coefficient spectra of the new glasses were derived by comparing with the gain spectrum of fused silica. The bandwidth of the gain spectra of the present tellurite glasses were more than twice that of a conventional TeO2-Bi2O3-ZnO-Na2O glass and 70% larger than silica glass. However, gain coefficient of glasses with broader bandwidths was not impressive. This made us to use transition metal oxides as a network modifier in place of the alkaline earth oxide and use them as base glasses. By doing so, higher gain coefficients and broader bandwidths were achieved in a single glass.

Paper Details

Date Published: 20 February 2007
PDF: 11 pages
Proc. SPIE 6469, Optical Components and Materials IV, 64690K (20 February 2007); doi: 10.1117/12.705785
Show Author Affiliations
Rajan Jose, Toyota Technological Institute (Japan)
Yasutake Ohishi, Toyota Technological Institute (Japan)

Published in SPIE Proceedings Vol. 6469:
Optical Components and Materials IV
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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