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Refractive index dispersion of gallium lanthanum sulfide and oxysulfide glasses

Refractive index dispersion of gallium lanthanum sulfide and oxysulfide glasses
Refractive index dispersion of gallium lanthanum sulfide and oxysulfide glasses
Refractive indexes were measured for Ga2S3-La2S3 and Ga2S3-La2O3 glasses in the range of 0.48 and 1.71µm using the minimum deviation method. Data is analyzed by the Wemple equation based on the single oscillator model. These glasses have relatively large average bandgaps Eo, and electronic oscillator strengths Ed, in comparison with other chalcogenide glasses. Possible origins of these features are discussed. Introduction: Gallium lanthanum sulfide (GLS) glass is one of leading candidates for 1.3 µm optical fibre amplifiers [1], infrared lasers [2,3], acousto-optic modulators [4], and optical switching devices [5]. It possesses high quantum efficiencies of the forced electric dipole transitions, resulting from high radiative rate and low non-radiative multiphonon decay rate. These desirable properties follow from its high refractive indexes over 2.4 [6] and a low maximum phonon energy of ~ 425/cm [1]. GLS glass is of particular interest for practical devices because of its relatively low toxicity, thermal stability and ability to draw into fibre, as well as its superior optical properties. The high refractive index with a wide optically transparent range of 0.5 and 10µm [4] also results in high third-order optical nonlinearity due to the electronic origin for ultra-fast optical switching [5]. The purpose of this study is to measure accurate refractive indexes of GLS-based glasses in the UV and near-infrared region, which are useful data to characterize optical materials, and to discuss their dispersion characteristics in comparison with other chalcogenide, oxide and fluoride glasses for optic applications
0022-3093
187-191
Yayama, Hiroyuki
10b31e67-ef4b-458d-aae7-6846989c2ea0
Fujino, Shingeru
6fe33c37-0bf3-4e6c-aaec-1f2c1a976c66
Morinaga, Kenji
38741794-113c-4fac-a9e6-4eccfa9a575c
Takebe, Hiromichi
44cd8a67-eea3-46fa-91f6-80fcc386afbe
Hewak, Daniel W.
87c80070-c101-4f7a-914f-4cc3131e3db0
Payne, David N.
4f592b24-707f-456e-b2c6-8a6f750e296d
Yayama, Hiroyuki
10b31e67-ef4b-458d-aae7-6846989c2ea0
Fujino, Shingeru
6fe33c37-0bf3-4e6c-aaec-1f2c1a976c66
Morinaga, Kenji
38741794-113c-4fac-a9e6-4eccfa9a575c
Takebe, Hiromichi
44cd8a67-eea3-46fa-91f6-80fcc386afbe
Hewak, Daniel W.
87c80070-c101-4f7a-914f-4cc3131e3db0
Payne, David N.
4f592b24-707f-456e-b2c6-8a6f750e296d

Yayama, Hiroyuki, Fujino, Shingeru, Morinaga, Kenji, Takebe, Hiromichi, Hewak, Daniel W. and Payne, David N. (1998) Refractive index dispersion of gallium lanthanum sulfide and oxysulfide glasses. Journal of Non-Crystalline Solids, 239, 187-191. (doi:10.1016/S0022-3093(98)00737-6).

Record type: Article

Abstract

Refractive indexes were measured for Ga2S3-La2S3 and Ga2S3-La2O3 glasses in the range of 0.48 and 1.71µm using the minimum deviation method. Data is analyzed by the Wemple equation based on the single oscillator model. These glasses have relatively large average bandgaps Eo, and electronic oscillator strengths Ed, in comparison with other chalcogenide glasses. Possible origins of these features are discussed. Introduction: Gallium lanthanum sulfide (GLS) glass is one of leading candidates for 1.3 µm optical fibre amplifiers [1], infrared lasers [2,3], acousto-optic modulators [4], and optical switching devices [5]. It possesses high quantum efficiencies of the forced electric dipole transitions, resulting from high radiative rate and low non-radiative multiphonon decay rate. These desirable properties follow from its high refractive indexes over 2.4 [6] and a low maximum phonon energy of ~ 425/cm [1]. GLS glass is of particular interest for practical devices because of its relatively low toxicity, thermal stability and ability to draw into fibre, as well as its superior optical properties. The high refractive index with a wide optically transparent range of 0.5 and 10µm [4] also results in high third-order optical nonlinearity due to the electronic origin for ultra-fast optical switching [5]. The purpose of this study is to measure accurate refractive indexes of GLS-based glasses in the UV and near-infrared region, which are useful data to characterize optical materials, and to discuss their dispersion characteristics in comparison with other chalcogenide, oxide and fluoride glasses for optic applications

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Published date: October 1998

Identifiers

Local EPrints ID: 77769
URI: https://eprints.soton.ac.uk/id/eprint/77769
ISSN: 0022-3093
PURE UUID: bf9e1305-8868-4d23-aaae-d3a574951593
ORCID for Daniel W. Hewak: ORCID iD orcid.org/0000-0002-2093-5773

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Date deposited: 11 Mar 2010
Last modified: 19 Jul 2019 01:16

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