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Low-threshold monomode ion-exchanged waveguide lasers in neodymium-doped BK-7 glass

Low-threshold monomode ion-exchanged waveguide lasers in neodymium-doped BK-7 glass
Low-threshold monomode ion-exchanged waveguide lasers in neodymium-doped BK-7 glass
The ion exchange technique has been advanced as method of fabrication of active integrated optic devices in glass substrates. Multimode waveguides have previously been made in rare-earth doped glasses and optically pumped to provide amplifying media or lasers. However lasers fabricated using single-mode waveguides have lower thresholds than multimode devices. In this paper we report the first demonstration of a monomode ion exchanged laser in neodymium doped BK-7 glass. The technique is suitable for batch processing of devices at low cost. In addition the waveguide fields can be easily perturbed in the planar geometry enabling a variety of devices such as modulators, ring and coupled-cavities, and wavelength multiplexers to be integrated. Development of active integrated optic devices in glass has been hampered by lack of rare-earth doped glasses with suitable ion exchange chemistry. In our case this drawback has been removed by selecting an ion-exchangeable glass and doping it with the required rare-earth ions. This also allows variation of the dopant concentration to optimise laser performance. BK-7 was chosen as the basic glass because of its good optical quality and excellent ion exchange properties with silver, potassium and caesium ions which allow waveguides with a wide range of numerical apertures to be easily fabricated.
In our studies BK-7 glass was doped with 2 wt% neodymium oxide to form the substrate. Single-transverse-mode waveguide lasers were fabricated in the substrate by potassium ion exchange.
0013-5194
1317-1318
Mwarania, E.K.
500f2694-71ee-4266-b2b4-d781743d6636
Reekie, L.
ec314137-6924-44ad-86a4-ff3f9a67c1b5
Wang, J.
53d8d8bd-3c17-406e-9acf-961cc86b9a00
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Mwarania, E.K.
500f2694-71ee-4266-b2b4-d781743d6636
Reekie, L.
ec314137-6924-44ad-86a4-ff3f9a67c1b5
Wang, J.
53d8d8bd-3c17-406e-9acf-961cc86b9a00
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca

Mwarania, E.K., Reekie, L., Wang, J. and Wilkinson, J.S. (1990) Low-threshold monomode ion-exchanged waveguide lasers in neodymium-doped BK-7 glass. Electronics Letters, 26 (16), 1317-1318. (doi:10.1049/el:19900846).

Record type: Article

Abstract

The ion exchange technique has been advanced as method of fabrication of active integrated optic devices in glass substrates. Multimode waveguides have previously been made in rare-earth doped glasses and optically pumped to provide amplifying media or lasers. However lasers fabricated using single-mode waveguides have lower thresholds than multimode devices. In this paper we report the first demonstration of a monomode ion exchanged laser in neodymium doped BK-7 glass. The technique is suitable for batch processing of devices at low cost. In addition the waveguide fields can be easily perturbed in the planar geometry enabling a variety of devices such as modulators, ring and coupled-cavities, and wavelength multiplexers to be integrated. Development of active integrated optic devices in glass has been hampered by lack of rare-earth doped glasses with suitable ion exchange chemistry. In our case this drawback has been removed by selecting an ion-exchangeable glass and doping it with the required rare-earth ions. This also allows variation of the dopant concentration to optimise laser performance. BK-7 was chosen as the basic glass because of its good optical quality and excellent ion exchange properties with silver, potassium and caesium ions which allow waveguides with a wide range of numerical apertures to be easily fabricated.
In our studies BK-7 glass was doped with 2 wt% neodymium oxide to form the substrate. Single-transverse-mode waveguide lasers were fabricated in the substrate by potassium ion exchange.

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Published date: 1990

Identifiers

Local EPrints ID: 78397
URI: https://eprints.soton.ac.uk/id/eprint/78397
ISSN: 0013-5194
PURE UUID: 26f11d1d-a267-4c41-a735-2c5a4dae4f53
ORCID for J.S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

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Date deposited: 11 Mar 2010
Last modified: 03 Apr 2019 00:38

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Contributors

Author: E.K. Mwarania
Author: L. Reekie
Author: J. Wang
Author: J.S. Wilkinson ORCID iD

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