Passive matching of large nonlinear phase in ultrafast twin-core fiber amplifier for coherent combination
Passive matching of large nonlinear phase in ultrafast twin-core fiber amplifier for coherent combination
We use a bespoke design and fabrication procedure to realize a polarization-maintaining Yb-doped fiber with two near-identical, un-coupled, cores, suitable for coherent beam combination (CBC) of ultrashort pulses at large nonlinear phase accumulation. Using an in-house Dammann grating for seeding the two cores from a common input, we experimentally evaluated parabolic pulse amplification at 1064 nm. From a measured output interference pattern at a B-integral of 26 rad ± 15% according to simulations, we calculated a theoretical CBC efficiency of 88.5%, which to our knowledge is unprecedented with such high nonlinear phase. This suggests an averaged difference in B between channels of at most 0.5 rad (1.9% of 26 rad). Also, the 27 nm spectral width requires better than 17 μm optical path-length (OPL) matching. The OPL and B-integral remained stably equalized as B increased to 26 rad, suggesting that multicore fibers with carefully fabricated cores are well suited to power and energy scaling through CBC of pulses at high nonlinearity.
Lin, Huaiqin
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Feng, Yujun
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Barua, Pranabesh
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6
Kunkel, W. Minster
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Price, Jonathan H.V.
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Sahu, Jayanta K.
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Leger, James R.
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Nilsson, Johan
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Lin, Huaiqin
0e8f318a-0864-4c8f-803b-9fd9f13009f5
Feng, Yujun
25a28374-33d9-478f-9bd2-98f0d93231af
Barua, Pranabesh
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6
Kunkel, W. Minster
63259856-2c13-455d-803c-663580076131
Price, Jonathan H.V.
fddcce17-291b-4d01-bd38-8fb0453abdc8
Sahu, Jayanta K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Leger, James R.
7afbc5c6-2518-49bf-8b03-1a2456ebe2d8
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Lin, Huaiqin, Feng, Yujun, Barua, Pranabesh, Kunkel, W. Minster, Price, Jonathan H.V., Sahu, Jayanta K., Leger, James R. and Nilsson, Johan
(2020)
Passive matching of large nonlinear phase in ultrafast twin-core fiber amplifier for coherent combination.
Optics Letters.
(Submitted)
Abstract
We use a bespoke design and fabrication procedure to realize a polarization-maintaining Yb-doped fiber with two near-identical, un-coupled, cores, suitable for coherent beam combination (CBC) of ultrashort pulses at large nonlinear phase accumulation. Using an in-house Dammann grating for seeding the two cores from a common input, we experimentally evaluated parabolic pulse amplification at 1064 nm. From a measured output interference pattern at a B-integral of 26 rad ± 15% according to simulations, we calculated a theoretical CBC efficiency of 88.5%, which to our knowledge is unprecedented with such high nonlinear phase. This suggests an averaged difference in B between channels of at most 0.5 rad (1.9% of 26 rad). Also, the 27 nm spectral width requires better than 17 μm optical path-length (OPL) matching. The OPL and B-integral remained stably equalized as B increased to 26 rad, suggesting that multicore fibers with carefully fabricated cores are well suited to power and energy scaling through CBC of pulses at high nonlinearity.
Text
414049
- Author's Original
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Submitted date: 1 November 2020
Identifiers
Local EPrints ID: 482749
URI: http://eprints.soton.ac.uk/id/eprint/482749
ISSN: 0146-9592
PURE UUID: de8e4a58-53bb-4866-b100-beb0fd3d274e
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Date deposited: 12 Oct 2023 16:40
Last modified: 17 Mar 2024 06:07
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