A 0.82 μm, 105 W diode-pumped thulium-doped all-silica-fiber laser
A 0.82 μm, 105 W diode-pumped thulium-doped all-silica-fiber laser
An all-silica-fiber thulium-doped fiber laser emitting at 0.82 μm on the transition from 3H4 to the ground state 3H6 outputs 105 W continuous-wave power and 555 W quasi-continuous-wave instantaneous power with 0.96% duty cycle in 240 μs rectangular pulses. The system comprises a double-clad thulium-doped fiber designed and fabricated in-house, incorporated into an all-fiber cavity and cladding-pumped by diode lasers at 0.79 μm. Co-lasing at 1.9 μm counteracts population trapping in 3F4. The slope efficiency reaches 64% and 77.5% under quasi-continuous-wave and continuous-wave operations, respectively. Under quasi-continuous-wave conditions, the beam quality M2 becomes 2.2 (beam parameter product: 0.57 mm mrad) and 2.45 (0.64 mm mrad) in orthogonal directions at approximately 250 W of instantaneous output power. In addition, a modified quasi-continuous-wave setup is continuously wavelength-tunable from 812 to 835 nm. We believe this is the first reported demonstration of high-power laser operation of the 3H4 → 3H6 transition in a thulium-doped fiber.
all-fiberization, diode pumping, high-power fiber laser, thulium-doped silica fiber, wavelength-tunable fiber laser
Hou, Changshun
a7ec959a-c88b-4d2d-af43-b56eea581de7
Zhai, Ziwei
95caa116-8203-4b74-aa67-b5d00cf14e6d
Choudhury, Nilotpal
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Harris, Tom
653cccc2-49bc-424d-af36-f6c8cc46ae59
Yang, Qiubai
6a8b7823-dcef-40cd-b4f6-203e49697900
Sahu, Jayanta K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
14 July 2025
Hou, Changshun
a7ec959a-c88b-4d2d-af43-b56eea581de7
Zhai, Ziwei
95caa116-8203-4b74-aa67-b5d00cf14e6d
Choudhury, Nilotpal
db8333e6-bcf1-4e1d-9334-dd6caf5939b5
Harris, Tom
653cccc2-49bc-424d-af36-f6c8cc46ae59
Yang, Qiubai
6a8b7823-dcef-40cd-b4f6-203e49697900
Sahu, Jayanta K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Hou, Changshun, Zhai, Ziwei, Choudhury, Nilotpal, Harris, Tom, Yang, Qiubai, Sahu, Jayanta K. and Nilsson, Johan
(2025)
A 0.82 μm, 105 W diode-pumped thulium-doped all-silica-fiber laser.
High Power Laser Science and Engineering, 13, [e58].
(doi:10.1017/hpl.2025.10053).
Abstract
An all-silica-fiber thulium-doped fiber laser emitting at 0.82 μm on the transition from 3H4 to the ground state 3H6 outputs 105 W continuous-wave power and 555 W quasi-continuous-wave instantaneous power with 0.96% duty cycle in 240 μs rectangular pulses. The system comprises a double-clad thulium-doped fiber designed and fabricated in-house, incorporated into an all-fiber cavity and cladding-pumped by diode lasers at 0.79 μm. Co-lasing at 1.9 μm counteracts population trapping in 3F4. The slope efficiency reaches 64% and 77.5% under quasi-continuous-wave and continuous-wave operations, respectively. Under quasi-continuous-wave conditions, the beam quality M2 becomes 2.2 (beam parameter product: 0.57 mm mrad) and 2.45 (0.64 mm mrad) in orthogonal directions at approximately 250 W of instantaneous output power. In addition, a modified quasi-continuous-wave setup is continuously wavelength-tunable from 812 to 835 nm. We believe this is the first reported demonstration of high-power laser operation of the 3H4 → 3H6 transition in a thulium-doped fiber.
Text
a-082-mm-105-w-diode-pumped-thulium-doped-all-silica-fiber-laser
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Accepted/In Press date: 7 July 2025
e-pub ahead of print date: 14 July 2025
Published date: 14 July 2025
Keywords:
all-fiberization, diode pumping, high-power fiber laser, thulium-doped silica fiber, wavelength-tunable fiber laser
Identifiers
Local EPrints ID: 510964
URI: http://eprints.soton.ac.uk/id/eprint/510964
ISSN: 2095-4719
PURE UUID: bdaa83a8-22e2-4637-8b85-1d136683ad0e
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Date deposited: 28 Apr 2026 16:39
Last modified: 29 Apr 2026 02:09
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