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Graphene Q-switched Yb:Yttria waveguide laser by evanescent-field interaction delivering an average output power of 0.5 W

Graphene Q-switched Yb:Yttria waveguide laser by evanescent-field interaction delivering an average output power of 0.5 W
Graphene Q-switched Yb:Yttria waveguide laser by evanescent-field interaction delivering an average output power of 0.5 W
Pulsed waveguide lasers are interesting sources for a wide range of applications ranging from medicine, industrial processing and defence. Waveguides offer monolithic integrated structures with a natural geometric compatibility with high-power diode laser pump sources allowing compact devices. Additionally, if propagation losses can be kept low, the optical confinement can lead to low laser thresholds, high efficiencies, and low power requirements for passive Q-switching or mode-locking via saturable absorbers (SAs). Rare-earth-doped sesquioxide materials, such as yttria, possess physical and spectroscopic properties that make them very interesting for high-power solid-state lasers, and we have recently reported Q-switched operation of a pulsed laser deposited (PLD)-grown Yb:Y2O3 waveguide using a graphene-covered output coupler as an SA. The output power of this laser was limited by damage to the graphene layer, which is directly in the path of the laser beam. However, waveguides also offer the opportunity of coupling the laser beam to the saturable absorber via evanescent-field coupling and this in turn offers the possibility of high-power pulsed operation.
In this paper, we demonstrate an Yb:Y2O3 waveguide laser Q-switched using evanescent-field interaction with graphene. 310 nJ pulses at an average power of 456 mW were obtained from a graphene-covered Yb:Y2O3 waveguide, which represents more than an order of magnitude improvement when compared to previous Q-switched waveguide lasers using end-butted graphene.
Choudhary, A.
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Beecher, S.J.
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Dhingra, S.
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D'Urso, B.
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Parsonage, T.L.
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Grant-Jacob, J.A.
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Hua, P.
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Mackenzie, J.I.
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Eason, R.W.
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Shepherd, D.P.
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Choudhary, A.
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Beecher, S.J.
b3664adc-d6b5-4a5a-a09a-8e1415c6d3f5
Dhingra, S.
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D'Urso, B.
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Parsonage, T.L.
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Grant-Jacob, J.A.
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Hua, P.
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Mackenzie, J.I.
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Eason, R.W.
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Shepherd, D.P.
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Choudhary, A., Beecher, S.J., Dhingra, S., D'Urso, B., Parsonage, T.L., Grant-Jacob, J.A., Hua, P., Mackenzie, J.I., Eason, R.W. and Shepherd, D.P. (2015) Graphene Q-switched Yb:Yttria waveguide laser by evanescent-field interaction delivering an average output power of 0.5 W. European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, Germany. 21 - 25 Jun 2015. 1 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Pulsed waveguide lasers are interesting sources for a wide range of applications ranging from medicine, industrial processing and defence. Waveguides offer monolithic integrated structures with a natural geometric compatibility with high-power diode laser pump sources allowing compact devices. Additionally, if propagation losses can be kept low, the optical confinement can lead to low laser thresholds, high efficiencies, and low power requirements for passive Q-switching or mode-locking via saturable absorbers (SAs). Rare-earth-doped sesquioxide materials, such as yttria, possess physical and spectroscopic properties that make them very interesting for high-power solid-state lasers, and we have recently reported Q-switched operation of a pulsed laser deposited (PLD)-grown Yb:Y2O3 waveguide using a graphene-covered output coupler as an SA. The output power of this laser was limited by damage to the graphene layer, which is directly in the path of the laser beam. However, waveguides also offer the opportunity of coupling the laser beam to the saturable absorber via evanescent-field coupling and this in turn offers the possibility of high-power pulsed operation.
In this paper, we demonstrate an Yb:Y2O3 waveguide laser Q-switched using evanescent-field interaction with graphene. 310 nJ pulses at an average power of 456 mW were obtained from a graphene-covered Yb:Y2O3 waveguide, which represents more than an order of magnitude improvement when compared to previous Q-switched waveguide lasers using end-butted graphene.

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Published date: June 2015
Venue - Dates: European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, Germany, 2015-06-21 - 2015-06-25
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 379722
URI: https://eprints.soton.ac.uk/id/eprint/379722
PURE UUID: 253e7337-9359-4985-9cfb-f3a593d8025a
ORCID for J.A. Grant-Jacob: ORCID iD orcid.org/0000-0002-4270-4247
ORCID for J.I. Mackenzie: ORCID iD orcid.org/0000-0002-3355-6051
ORCID for R.W. Eason: ORCID iD orcid.org/0000-0001-9704-2204
ORCID for D.P. Shepherd: ORCID iD orcid.org/0000-0002-4561-8184

Catalogue record

Date deposited: 29 Jul 2015 11:54
Last modified: 31 Jan 2019 01:39

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