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Pulsed Yb-doped phospho-silicate fiber MOPA source with 25kW peak power and excellent beam quality

Pulsed Yb-doped phospho-silicate fiber MOPA source with 25kW peak power and excellent beam quality
Pulsed Yb-doped phospho-silicate fiber MOPA source with 25kW peak power and excellent beam quality
With ytterbium doped fiber (YDF) lasers and amplifiers have reached continuous wave output power of multi-kW with direct diode pumping [1] and 10kW with tandem pumping [2] in a good beam quality, today fiber lasers are becoming the laser choice for many industrial applications and processes, defense, and scientific research. One of the challenges of high average power fiber laser is to maintain a long-term stability of the output power. In particular, photodarkening (PD) is seen as a power loss in YDF gain medium that can significantly influence the operation lifetime of the device. Moreover, it was observed that the PD is related to the transverse mode instability (TMI) that can limit the output power of the laser [3]. Here we report an efficient Yb-PS high power laser fiber fabricated using an optimized MCVD (modified chemical vapor deposition) and all-vapor -phase chelate precursor doping technique. Double -clad fi ber with a 150µm quasi-octagonal inner cladding and a 12i.tm core diameter was drawn with a low index polymer outer cladding. The core NA was 0.1, Fig.1 (a). The small signal absorption at the pump wavelength of -976nm was measured as 2.5 dB/m. Initially the fiber was tested in a 4%-4% laser cavity. An output power of >100W (limited by the available pump power) and the slope efficiency of >85% were obtained. The laser emission was centered at 1066nm.
Sahu, J.K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Lin, Di
d858c2c7-6eab-49d8-87e7-6b71d9bad013
Ramírez-Martínez, N.J.
3c0182fc-1942-4cf5-973f-72e0cafa7fcd
Umnikov, A.A.
9b57cc1b-d0f9-4c34-9409-a58ee0f70250
Núñez-Velázquez, M.
3c102956-ac51-4d02-9fe6-6628557cfbff
Barua, P.
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6
Sahu, J.K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Lin, Di
d858c2c7-6eab-49d8-87e7-6b71d9bad013
Ramírez-Martínez, N.J.
3c0182fc-1942-4cf5-973f-72e0cafa7fcd
Umnikov, A.A.
9b57cc1b-d0f9-4c34-9409-a58ee0f70250
Núñez-Velázquez, M.
3c102956-ac51-4d02-9fe6-6628557cfbff
Barua, P.
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6

Sahu, J.K., Lin, Di, Ramírez-Martínez, N.J., Umnikov, A.A., Núñez-Velázquez, M. and Barua, P. (2019) Pulsed Yb-doped phospho-silicate fiber MOPA source with 25kW peak power and excellent beam quality. 1 pp . (doi:10.1109/CLEOE-EQEC.2019.8872677).

Record type: Conference or Workshop Item (Poster)

Abstract

With ytterbium doped fiber (YDF) lasers and amplifiers have reached continuous wave output power of multi-kW with direct diode pumping [1] and 10kW with tandem pumping [2] in a good beam quality, today fiber lasers are becoming the laser choice for many industrial applications and processes, defense, and scientific research. One of the challenges of high average power fiber laser is to maintain a long-term stability of the output power. In particular, photodarkening (PD) is seen as a power loss in YDF gain medium that can significantly influence the operation lifetime of the device. Moreover, it was observed that the PD is related to the transverse mode instability (TMI) that can limit the output power of the laser [3]. Here we report an efficient Yb-PS high power laser fiber fabricated using an optimized MCVD (modified chemical vapor deposition) and all-vapor -phase chelate precursor doping technique. Double -clad fi ber with a 150µm quasi-octagonal inner cladding and a 12i.tm core diameter was drawn with a low index polymer outer cladding. The core NA was 0.1, Fig.1 (a). The small signal absorption at the pump wavelength of -976nm was measured as 2.5 dB/m. Initially the fiber was tested in a 4%-4% laser cavity. An output power of >100W (limited by the available pump power) and the slope efficiency of >85% were obtained. The laser emission was centered at 1066nm.

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Published date: 17 October 2019

Identifiers

Local EPrints ID: 441951
URI: http://eprints.soton.ac.uk/id/eprint/441951
PURE UUID: def2e288-de15-48a5-96c3-850ea00743be
ORCID for J.K. Sahu: ORCID iD orcid.org/0000-0003-3560-6152
ORCID for Di Lin: ORCID iD orcid.org/0000-0001-5025-9051
ORCID for N.J. Ramírez-Martínez: ORCID iD orcid.org/0000-0001-8711-792X
ORCID for A.A. Umnikov: ORCID iD orcid.org/0000-0001-6006-5410
ORCID for M. Núñez-Velázquez: ORCID iD orcid.org/0000-0003-0774-3272

Catalogue record

Date deposited: 02 Jul 2020 16:35
Last modified: 13 Dec 2021 03:24

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Contributors

Author: J.K. Sahu ORCID iD
Author: Di Lin ORCID iD
Author: N.J. Ramírez-Martínez ORCID iD
Author: A.A. Umnikov ORCID iD
Author: P. Barua

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