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Demonstration of arbitrary temporal shaping of picosecond pulses in a radially polarized Yb-fiber MOPA with > 10 W average power

Demonstration of arbitrary temporal shaping of picosecond pulses in a radially polarized Yb-fiber MOPA with > 10 W average power
Demonstration of arbitrary temporal shaping of picosecond pulses in a radially polarized Yb-fiber MOPA with > 10 W average power
High precision surface processing has an unmet demand for picosecond pulses with arbitrary temporal profiles in radial polarization states and at high average powers. Here, simultaneous spatial and arbitrary temporal shaping of chirped 10 – 100 picoseconds pulses is demonstrated with an Yb-doped fiber laser system generating an output power of more than 10 W at 40 MHz repetition frequency. The closed-loop control algorithm carves the pulses using a commercial, rugged, and fiberized optical pulse shaper placed at the front end of the system and uses feedback from the output pulse shapes for optimization. Arbitrary complex temporal profiles were demonstrated using a dispersive Fourier transform based technique and limits set by the system were investigated. Pulse shaping in the spatial domain was accomplished using an S-waveplate, fabricated in-house, to change the linearly polarized fundamental mode into a doughnut mode with radial polarization. This was amplified in a final-stage few-mode large-mode area fiber amplifier. Placing both temporal and spatial shaping elements before the power-amplifier avoids complex and potentially lossy conversion of the spatial mode profile at the output and provides an efficient route for power-scaling. The use of properly oriented quarter- and half-wave plates, which have both low loss and high power handling capability, enabled the output to be set to pure radial or azimuthal polarization states. Using commercial off-the-shelf components, our technique is able to immediately enhance the versatility of ultrashort fiber laser systems for high precision material processing and other industrial applications.
1094-4087
15402-15413
Zhang, Betty Meng
93b8aca7-c6ae-45b9-9bcd-c201fdf2d116
Feng, Yujun
25a28374-33d9-478f-9bd2-98f0d93231af
Lin, Di
d858c2c7-6eab-49d8-87e7-6b71d9bad013
Price, Jonathan H.V.
fddcce17-291b-4d01-bd38-8fb0453abdc8
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Alam, Shaiful
2b6bdbe5-ddcc-4a88-9057-299360b93435
Shum, Perry Ping
ff8c91e7-6560-468b-813d-0da021b81f04
Payne, David Neil
4f592b24-707f-456e-b2c6-8a6f750e296d
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Zhang, Betty Meng
93b8aca7-c6ae-45b9-9bcd-c201fdf2d116
Feng, Yujun
25a28374-33d9-478f-9bd2-98f0d93231af
Lin, Di
d858c2c7-6eab-49d8-87e7-6b71d9bad013
Price, Jonathan H.V.
fddcce17-291b-4d01-bd38-8fb0453abdc8
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Alam, Shaiful
2b6bdbe5-ddcc-4a88-9057-299360b93435
Shum, Perry Ping
ff8c91e7-6560-468b-813d-0da021b81f04
Payne, David Neil
4f592b24-707f-456e-b2c6-8a6f750e296d
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3

Zhang, Betty Meng, Feng, Yujun, Lin, Di, Price, Jonathan H.V., Nilsson, Johan, Alam, Shaiful, Shum, Perry Ping, Payne, David Neil and Richardson, David J. (2017) Demonstration of arbitrary temporal shaping of picosecond pulses in a radially polarized Yb-fiber MOPA with > 10 W average power. Optics Express, 25 (13), 15402-15413. (doi:10.1364/OE.25.015402).

Record type: Article

Abstract

High precision surface processing has an unmet demand for picosecond pulses with arbitrary temporal profiles in radial polarization states and at high average powers. Here, simultaneous spatial and arbitrary temporal shaping of chirped 10 – 100 picoseconds pulses is demonstrated with an Yb-doped fiber laser system generating an output power of more than 10 W at 40 MHz repetition frequency. The closed-loop control algorithm carves the pulses using a commercial, rugged, and fiberized optical pulse shaper placed at the front end of the system and uses feedback from the output pulse shapes for optimization. Arbitrary complex temporal profiles were demonstrated using a dispersive Fourier transform based technique and limits set by the system were investigated. Pulse shaping in the spatial domain was accomplished using an S-waveplate, fabricated in-house, to change the linearly polarized fundamental mode into a doughnut mode with radial polarization. This was amplified in a final-stage few-mode large-mode area fiber amplifier. Placing both temporal and spatial shaping elements before the power-amplifier avoids complex and potentially lossy conversion of the spatial mode profile at the output and provides an efficient route for power-scaling. The use of properly oriented quarter- and half-wave plates, which have both low loss and high power handling capability, enabled the output to be set to pure radial or azimuthal polarization states. Using commercial off-the-shelf components, our technique is able to immediately enhance the versatility of ultrashort fiber laser systems for high precision material processing and other industrial applications.

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More information

Accepted/In Press date: 16 May 2017
e-pub ahead of print date: 22 June 2017
Published date: 26 June 2017
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 408294
URI: http://eprints.soton.ac.uk/id/eprint/408294
ISSN: 1094-4087
PURE UUID: 124403a0-08f3-4ba0-b91b-6972d6466eb4
ORCID for Yujun Feng: ORCID iD orcid.org/0000-0001-7839-065X
ORCID for Di Lin: ORCID iD orcid.org/0000-0001-5025-9051
ORCID for Jonathan H.V. Price: ORCID iD orcid.org/0000-0003-0256-9172
ORCID for Johan Nilsson: ORCID iD orcid.org/0000-0003-1691-7959
ORCID for David J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058

Catalogue record

Date deposited: 19 May 2017 04:02
Last modified: 27 Aug 2020 01:41

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