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Characterisation of compositional photosensitivity dependence of Ga-La-S thin films fabricated by pulsed laser deposition

Characterisation of compositional photosensitivity dependence of Ga-La-S thin films fabricated by pulsed laser deposition
Characterisation of compositional photosensitivity dependence of Ga-La-S thin films fabricated by pulsed laser deposition
Thin films of chalcogenide glasses of Ga-La-S composition (GLS) have recently been grown via the technique of pulsed laser deposition (PLD). These non-oxide glasses have many attractive features including a wide transmission range which extends from visible wavelengths up to ~10 micron, and low phonon energies, which drastically reduce non-radiative relaxation rates, thus making them interesting candidates for infra-red laser hosts. Furthermore, under irradiation with light in the blue/uv wavelength region, these glasses can exhibit several photostructural effects including photobleaching, photodoping, and more complicated reconfiguration behaviour, in which refractive index variations of the order of 1% can easily be produced. The exact cause of such index changes is uncertain, but the possibility of writing diffractive grating structures with sub-micron resolution in waveguide GLS structures holds out much potential for distributed feedback integrated optical devices. Previous results on both laser and e-beam grating writing have revealed the ease with which gratings can be produced in GLS films, but so far, no systematic study has been undertaken on how the induced refractive index change depends on exact compositional properties of the GLS glasses.
ULF-LENS
Eason, R.W.
e38684c3-d18c-41b9-a4aa-def67283b020
Gill, D.S.
0837886a-5999-478f-8b32-ea1996611c3c
Anderson, A.A.
646395a3-662e-4ad2-9a45-50ec63847687
Hewak, D.W.
87c80070-c101-4f7a-914f-4cc3131e3db0
Moore, R.C.
a7d68363-4127-4f7b-9da4-ef66d19ab327
Mailis, S.
233e0768-3f8d-430e-8fdf-92e6f4f6a0c4
Vainos, N.
7119b61d-73cc-4842-9c1a-b87672d09333
Hatziapostolou, A.
8efd6611-347d-48dc-9e53-3df193e2ae9d
Eason, R.W.
e38684c3-d18c-41b9-a4aa-def67283b020
Gill, D.S.
0837886a-5999-478f-8b32-ea1996611c3c
Anderson, A.A.
646395a3-662e-4ad2-9a45-50ec63847687
Hewak, D.W.
87c80070-c101-4f7a-914f-4cc3131e3db0
Moore, R.C.
a7d68363-4127-4f7b-9da4-ef66d19ab327
Mailis, S.
233e0768-3f8d-430e-8fdf-92e6f4f6a0c4
Vainos, N.
7119b61d-73cc-4842-9c1a-b87672d09333
Hatziapostolou, A.
8efd6611-347d-48dc-9e53-3df193e2ae9d

Eason, R.W., Gill, D.S., Anderson, A.A., Hewak, D.W., Moore, R.C., Mailis, S., Vainos, N. and Hatziapostolou, A. (1995) Characterisation of compositional photosensitivity dependence of Ga-La-S thin films fabricated by pulsed laser deposition (Annual Report 1994-1995) GB. ULF-LENS 16pp.

Record type: Monograph (Project Report)

Abstract

Thin films of chalcogenide glasses of Ga-La-S composition (GLS) have recently been grown via the technique of pulsed laser deposition (PLD). These non-oxide glasses have many attractive features including a wide transmission range which extends from visible wavelengths up to ~10 micron, and low phonon energies, which drastically reduce non-radiative relaxation rates, thus making them interesting candidates for infra-red laser hosts. Furthermore, under irradiation with light in the blue/uv wavelength region, these glasses can exhibit several photostructural effects including photobleaching, photodoping, and more complicated reconfiguration behaviour, in which refractive index variations of the order of 1% can easily be produced. The exact cause of such index changes is uncertain, but the possibility of writing diffractive grating structures with sub-micron resolution in waveguide GLS structures holds out much potential for distributed feedback integrated optical devices. Previous results on both laser and e-beam grating writing have revealed the ease with which gratings can be produced in GLS films, but so far, no systematic study has been undertaken on how the induced refractive index change depends on exact compositional properties of the GLS glasses.

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Published date: 1995
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 394286
URI: https://eprints.soton.ac.uk/id/eprint/394286
PURE UUID: ecb86eda-9b7e-405d-9e19-293eacff84e5
ORCID for R.W. Eason: ORCID iD orcid.org/0000-0001-9704-2204
ORCID for D.W. Hewak: ORCID iD orcid.org/0000-0002-2093-5773
ORCID for S. Mailis: ORCID iD orcid.org/0000-0001-8100-2670

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Date deposited: 13 May 2016 10:27
Last modified: 06 Jun 2018 13:13

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Contributors

Author: R.W. Eason ORCID iD
Author: D.S. Gill
Author: A.A. Anderson
Author: D.W. Hewak ORCID iD
Author: R.C. Moore
Author: S. Mailis ORCID iD
Author: N. Vainos
Author: A. Hatziapostolou

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