High-power, high-efficiency, all-fiberized laser-pumped, 260-nm, deep-UV laser for bacterial deactivation
High-power, high-efficiency, all-fiberized laser-pumped, 260-nm, deep-UV laser for bacterial deactivation
We report a 5.8-W deep-ultraviolet (DUV) laser obtained from frequency-quadrupling of an all-fiberized ytterbium-doped fiber (YDF) master oscillator power amplifier (MOPA). The MOPA system delivers 585 ps pulses at 1040 nm with a maximum available output power of 23.5 W for nonlinear frequency conversion. A lithium triborate (LBO) crystal and a beta barium borate (BBO) crystal are employed for second- and fourth-harmonic generation (FHG), respectively. At a repetition rate of 1.6 MHz, a maximum DUV output power of 5.8 W is obtained at 260 nm with a corresponding pulse energy of 3.6 μJ and maximum peak power of at least 6.9 kW. A 1μm-to-260nm conversion efficiency of 26.4% is achieved at a DUV output power of 5.8 W. To the best of our knowledge these results represent the highest-average-power fiberized-laser-pumped DUV laser, as well as the most efficient DUV generation based on BBO crystals to date. We further demonstrate application of the pulsed DUV laser in bacterial disinfection achieving an inactivation efficiency of 99.999% for E-coli bacteria at a DUV exposure of 7 mJ/cm2.
42485-42494
Fu, Qiang
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Hanrahan, Niall
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Xu, Lin
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Lane, Simon
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Lin, Di
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Jung, Yongmin
6685e51e-be47-4c96-8c4b-65aee3b5126d
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
20 December 2021
Fu, Qiang
b01fb880-ccd2-4acb-8d08-0a9668bed6e6
Hanrahan, Niall
df8a0edc-a5bd-4979-aa6f-0ea1bff159c3
Xu, Lin
b887cecd-d21e-49f4-9b45-6909a7369e84
Lane, Simon
8e80111f-5012-4950-a228-dfb8fb9df52d
Lin, Di
d858c2c7-6eab-49d8-87e7-6b71d9bad013
Jung, Yongmin
6685e51e-be47-4c96-8c4b-65aee3b5126d
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Fu, Qiang, Hanrahan, Niall, Xu, Lin, Lane, Simon, Lin, Di, Jung, Yongmin and Richardson, David J.
(2021)
High-power, high-efficiency, all-fiberized laser-pumped, 260-nm, deep-UV laser for bacterial deactivation.
Optics Express, 29 (26), .
(doi:10.1364/OE.441248).
Abstract
We report a 5.8-W deep-ultraviolet (DUV) laser obtained from frequency-quadrupling of an all-fiberized ytterbium-doped fiber (YDF) master oscillator power amplifier (MOPA). The MOPA system delivers 585 ps pulses at 1040 nm with a maximum available output power of 23.5 W for nonlinear frequency conversion. A lithium triborate (LBO) crystal and a beta barium borate (BBO) crystal are employed for second- and fourth-harmonic generation (FHG), respectively. At a repetition rate of 1.6 MHz, a maximum DUV output power of 5.8 W is obtained at 260 nm with a corresponding pulse energy of 3.6 μJ and maximum peak power of at least 6.9 kW. A 1μm-to-260nm conversion efficiency of 26.4% is achieved at a DUV output power of 5.8 W. To the best of our knowledge these results represent the highest-average-power fiberized-laser-pumped DUV laser, as well as the most efficient DUV generation based on BBO crystals to date. We further demonstrate application of the pulsed DUV laser in bacterial disinfection achieving an inactivation efficiency of 99.999% for E-coli bacteria at a DUV exposure of 7 mJ/cm2.
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oe-29-26-42485
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Accepted/In Press date: 4 October 2021
Published date: 20 December 2021
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Acknowledgements. The authors acknowledge support from Dr Bill Brocklesby’s group for loan of their spectrometer to measure the DUV spectra and fruitful discussions with Prof. David Shepherd. Equipment support from the Biomolecular Core Group of facilities (School of Biological Sciences) and funding from Engineering and Physical Sciences Research Council Impact Acceleration 2020/21 award are also gratefully acknowledged.
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© 2021 OSA - The Optical Society. All rights reserved.
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Local EPrints ID: 451848
URI: http://eprints.soton.ac.uk/id/eprint/451848
ISSN: 1094-4087
PURE UUID: f97a0a3f-bf81-438c-a12a-7e270a4229e9
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Date deposited: 01 Nov 2021 17:31
Last modified: 17 Mar 2024 06:52
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