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Functional crystal films fabricated by pulsed laser deposition

Functional crystal films fabricated by pulsed laser deposition
Functional crystal films fabricated by pulsed laser deposition
Crystalline films grown by epitaxial deposition techniques are typically limited by growth rates to being relatively thin (~<1 micron). We will report recent developments of our Pulsed Laser Deposition (PLD) system that have increased growth rates up to 20 microns/hr for garnets, whilst improving the quality of the resulting crystals, enabling routine fabrication of ~> 10 micron thick layers. With these films we have demonstrated the first PLD-grown waveguide lasers with slope efficiencies to 70% and over 20W of output power. The same Yb:Y3Al5O12 waveguide has also been used as a double-pass amplifier with 16dB of gain with equivalent output power.Due to the non-thermal-equilibrium conditions exploited in PLD, growth of refractory oxides such as sesquioxides (Lu2O3, Al2O3 and mixes LuxScyO3) are readily realised, which can also be doped with optically active ions to make active films, suitable for waveguide amplifiers and lasers. Furthermore, controlling the deposition parameters we have precise control of the film’s optical properties, such as refractive index and crystal composition, enabling the production of complex functionalised structures including a dual-core planar waveguide or crystalline Bragg mirrors. Damage thresholds of >30Jcm-2 were obtained from first experiments with a Bragg stack containing 45 garnet layers, which was also operated at temperatures over 700°C.
invited paper
Mackenzie, Jacob
1d82c826-fdbf-425b-ac04-be43ccf12008
Prentice, Jake, Jonathan
a053f4e8-3ebd-4625-a703-fc7b03f54e9c
Grant-Jacob, James
c5d144d8-3c43-4195-8e80-edd96bfda91b
Kurilchik, Sergey
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Shepherd, David
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Eason, Robert
e38684c3-d18c-41b9-a4aa-def67283b020
Mackenzie, Jacob
1d82c826-fdbf-425b-ac04-be43ccf12008
Prentice, Jake, Jonathan
a053f4e8-3ebd-4625-a703-fc7b03f54e9c
Grant-Jacob, James
c5d144d8-3c43-4195-8e80-edd96bfda91b
Kurilchik, Sergey
0b3cfff0-6d23-4568-bbf6-4204790993de
Shepherd, David
9fdd51c4-39d6-41b3-9021-4c033c2f4ead
Eason, Robert
e38684c3-d18c-41b9-a4aa-def67283b020

Mackenzie, Jacob, Prentice, Jake, Jonathan, Grant-Jacob, James, Kurilchik, Sergey, Shepherd, David and Eason, Robert (2018) Functional crystal films fabricated by pulsed laser deposition. Pacific Rim Laser Damage 2018: Optical Materials for High-Power Lasers: OPTICS &amp; PHOTONICS International Congress 2018, Yokohama, Japan. 25 - 27 Apr 2018. (In Press)

Record type: Conference or Workshop Item (Other)

Abstract

Crystalline films grown by epitaxial deposition techniques are typically limited by growth rates to being relatively thin (~<1 micron). We will report recent developments of our Pulsed Laser Deposition (PLD) system that have increased growth rates up to 20 microns/hr for garnets, whilst improving the quality of the resulting crystals, enabling routine fabrication of ~> 10 micron thick layers. With these films we have demonstrated the first PLD-grown waveguide lasers with slope efficiencies to 70% and over 20W of output power. The same Yb:Y3Al5O12 waveguide has also been used as a double-pass amplifier with 16dB of gain with equivalent output power.Due to the non-thermal-equilibrium conditions exploited in PLD, growth of refractory oxides such as sesquioxides (Lu2O3, Al2O3 and mixes LuxScyO3) are readily realised, which can also be doped with optically active ions to make active films, suitable for waveguide amplifiers and lasers. Furthermore, controlling the deposition parameters we have precise control of the film’s optical properties, such as refractive index and crystal composition, enabling the production of complex functionalised structures including a dual-core planar waveguide or crystalline Bragg mirrors. Damage thresholds of >30Jcm-2 were obtained from first experiments with a Bragg stack containing 45 garnet layers, which was also operated at temperatures over 700°C.

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More information

Accepted/In Press date: 7 March 2018
Venue - Dates: Pacific Rim Laser Damage 2018: Optical Materials for High-Power Lasers: OPTICS &amp; PHOTONICS International Congress 2018, Yokohama, Japan, 2018-04-25 - 2018-04-27
Keywords: invited paper

Identifiers

Local EPrints ID: 420451
URI: https://eprints.soton.ac.uk/id/eprint/420451
PURE UUID: a58d24c5-8510-417f-8611-ad7adcf899df
ORCID for Jacob Mackenzie: ORCID iD orcid.org/0000-0002-3355-6051
ORCID for James Grant-Jacob: ORCID iD orcid.org/0000-0002-4270-4247
ORCID for Sergey Kurilchik: ORCID iD orcid.org/0000-0002-6444-5709
ORCID for David Shepherd: ORCID iD orcid.org/0000-0002-4561-8184
ORCID for Robert Eason: ORCID iD orcid.org/0000-0001-9704-2204

Catalogue record

Date deposited: 08 May 2018 16:30
Last modified: 14 Mar 2019 01:55

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Contributors

Author: Jacob Mackenzie ORCID iD
Author: Sergey Kurilchik ORCID iD
Author: David Shepherd ORCID iD
Author: Robert Eason ORCID iD

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