High efficiency butt-coupling of a 405nm laser diode to hollow core fiber
High efficiency butt-coupling of a 405nm laser diode to hollow core fiber
We present a compact and efficient method for directly coupling a near-ultraviolet laser diode with high beam ellipticity to a hollow core fiber (HCF) using an all-fiber mode field diameter (MFD) converter. This MFD converter, approximately 1 mm in length and composed of graded-index fiber (GIF) and coreless fiber (CSF), effectively addresses the MFD mismatch between the laser diode and HCF through image magnification. As a proof of concept, we tested a 405 nm laser diode with a beam ellipticity of 2.37. Simulations predicted a coupling efficiency of ∼80%, and we achieved 67% experimentally. Additionally, we introduced an elliptic GIF to further enhance coupling efficiency for highly elliptical beams, leading to a significant performance improvement.
Optical components, optical coupling, optical fiber application
211-214
Meng, Jing
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Liang, Sijing
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Davidson, Ian a.
b685f949-e9e4-4e6b-9a59-36739de06a61
Jasion, Gregory t.
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Wheeler, Natalie
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Poletti, Francesco
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Xu, Lin
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Richardson, David j.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Jung, Yongmin
6685e51e-be47-4c96-8c4b-65aee3b5126d
14 January 2025
Meng, Jing
9daa2555-30ad-43ed-9993-16412c7f3730
Liang, Sijing
0bb48ad1-5bd9-4764-9664-5017a65db7d0
Davidson, Ian a.
b685f949-e9e4-4e6b-9a59-36739de06a61
Jasion, Gregory t.
2d56c7c6-c9c6-48ed-8f9d-d39d24e905b8
Wheeler, Natalie
0fd34178-a77b-4c71-a3a6-86a1f634f1a0
Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Xu, Lin
b887cecd-d21e-49f4-9b45-6909a7369e84
Richardson, David j.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Jung, Yongmin
6685e51e-be47-4c96-8c4b-65aee3b5126d
Meng, Jing, Liang, Sijing, Davidson, Ian a., Jasion, Gregory t., Wheeler, Natalie, Poletti, Francesco, Xu, Lin, Richardson, David j. and Jung, Yongmin
(2025)
High efficiency butt-coupling of a 405nm laser diode to hollow core fiber.
IEEE Photonics Technology Letters, 37 (4), .
(doi:10.1109/LPT.2025.3529601).
Abstract
We present a compact and efficient method for directly coupling a near-ultraviolet laser diode with high beam ellipticity to a hollow core fiber (HCF) using an all-fiber mode field diameter (MFD) converter. This MFD converter, approximately 1 mm in length and composed of graded-index fiber (GIF) and coreless fiber (CSF), effectively addresses the MFD mismatch between the laser diode and HCF through image magnification. As a proof of concept, we tested a 405 nm laser diode with a beam ellipticity of 2.37. Simulations predicted a coupling efficiency of ∼80%, and we achieved 67% experimentally. Additionally, we introduced an elliptic GIF to further enhance coupling efficiency for highly elliptical beams, leading to a significant performance improvement.
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Published date: 14 January 2025
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© 1989-2012 IEEE.
Keywords:
Optical components, optical coupling, optical fiber application
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Local EPrints ID: 503160
URI: http://eprints.soton.ac.uk/id/eprint/503160
ISSN: 1041-1135
PURE UUID: b9d2b4ae-6074-4b0c-97e3-b817735c7ab4
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Date deposited: 22 Jul 2025 17:04
Last modified: 06 Aug 2025 01:47
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