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CW demonstration of SHG spectral narrowing in a PPLN waveguide generating 2.5 W at 780 nm

CW demonstration of SHG spectral narrowing in a PPLN waveguide generating 2.5 W at 780 nm
CW demonstration of SHG spectral narrowing in a PPLN waveguide generating 2.5 W at 780 nm
Periodically poled lithium niobate (PPLN) waveguides are a proven and popular
means for efficient wavelength conversion. However, conventional PPLN waveguides typically have small mode field diameters (MFD) (≲6µm) or significant insertion and/or propagation losses, limiting their ability to operate at multi-watt power levels. In this work we utilise zinc indiffused PPLN ridge waveguides that have a larger MFD, favourable pump/SHG modal overlap, and low insertion losses. Here for the first time, we have demonstrated continuous wave (CW) spectral narrowing from a PPLN waveguide; both with high efficiency and multi-watt second harmonic generation (SHG). 2.5 W of 780 nm has been produced by SHG of an amplified 1560 nm telecom laser with a device efficiency of 58% in a 4.0 cm-long ridge waveguide. We have modelled conversion efficiency and applied experimentally measured waveguide parameters to show excellent agreement to the SHG spectra. Spectral narrowing of the full width half maximum (FWHM) of 35.7% has been measured as the nonlinear drive is increased. This work demonstrates that single-pass, multi-watt, CW SHG at 780 nm is feasible from our PPLN waveguide in the large conversion regime.
1094-4087
21382-21390
Carpenter, Lewis Glynn
0daa548e-0d42-4b06-b914-45bfbec41759
Berry, Sam A.
0f768f48-36c4-4599-8917-7aae657378a7
Gray, Alan Ciaran
fa9f2fca-7e1f-4245-a914-13f18ca5ce89
Gates, James
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Gawith, Corin
926665c0-84c7-4a1d-ae19-ee6d7d14c43e
Carpenter, Lewis Glynn
0daa548e-0d42-4b06-b914-45bfbec41759
Berry, Sam A.
0f768f48-36c4-4599-8917-7aae657378a7
Gray, Alan Ciaran
fa9f2fca-7e1f-4245-a914-13f18ca5ce89
Gates, James
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Gawith, Corin
926665c0-84c7-4a1d-ae19-ee6d7d14c43e

Carpenter, Lewis Glynn, Berry, Sam A., Gray, Alan Ciaran, Gates, James, Smith, Peter G.R. and Gawith, Corin (2020) CW demonstration of SHG spectral narrowing in a PPLN waveguide generating 2.5 W at 780 nm. Optics Express, 28 (15), 21382-21390. (doi:10.1364/OE.395566).

Record type: Article

Abstract

Periodically poled lithium niobate (PPLN) waveguides are a proven and popular
means for efficient wavelength conversion. However, conventional PPLN waveguides typically have small mode field diameters (MFD) (≲6µm) or significant insertion and/or propagation losses, limiting their ability to operate at multi-watt power levels. In this work we utilise zinc indiffused PPLN ridge waveguides that have a larger MFD, favourable pump/SHG modal overlap, and low insertion losses. Here for the first time, we have demonstrated continuous wave (CW) spectral narrowing from a PPLN waveguide; both with high efficiency and multi-watt second harmonic generation (SHG). 2.5 W of 780 nm has been produced by SHG of an amplified 1560 nm telecom laser with a device efficiency of 58% in a 4.0 cm-long ridge waveguide. We have modelled conversion efficiency and applied experimentally measured waveguide parameters to show excellent agreement to the SHG spectra. Spectral narrowing of the full width half maximum (FWHM) of 35.7% has been measured as the nonlinear drive is increased. This work demonstrates that single-pass, multi-watt, CW SHG at 780 nm is feasible from our PPLN waveguide in the large conversion regime.

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More information

Accepted/In Press date: 1 June 2020
e-pub ahead of print date: 7 July 2020
Published date: 20 July 2020

Identifiers

Local EPrints ID: 441712
URI: http://eprints.soton.ac.uk/id/eprint/441712
ISSN: 1094-4087
PURE UUID: 72c3a6e4-8e7d-4673-890d-6519238565f0
ORCID for Sam A. Berry: ORCID iD orcid.org/0000-0002-9538-8655
ORCID for James Gates: ORCID iD orcid.org/0000-0001-8671-5987
ORCID for Peter G.R. Smith: ORCID iD orcid.org/0000-0003-0319-718X
ORCID for Corin Gawith: ORCID iD orcid.org/0000-0002-3502-3558

Catalogue record

Date deposited: 24 Jun 2020 16:30
Last modified: 18 Feb 2021 16:56

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