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Raman amplification of optical beam carrying orbital angular momentum in a multimode step-index fiber

Raman amplification of optical beam carrying orbital angular momentum in a multimode step-index fiber
Raman amplification of optical beam carrying orbital angular momentum in a multimode step-index fiber

We experimentally demonstrate 15 dB of Raman amplification of 1115 nm pulses in an orbital angular momentum mode (OAMM) with charge l 2, S 1 in 5 m of step-index 25 μm-diameter-core fiber. The total output reaches 4.5 kW of peak power and 68.5 μJ of energy in ∼15 ns pulses at 4 kHz repetition rate. An Yb-doped fiber source pumps the Raman amplifier at 1060 nm with 60 ns pulses. Using a spatial light modulator for modal decomposition, we measure 83% purity for the amplified target OAMM of selected polarization. To the best of our knowledge, this is the first time high energy, peak power, gain, and purity are achieved in a fiber Raman amplifier for a single OAMM.

0146-9592
1658-1661
Pidishety, Shankar
b693fa46-8454-4577-8166-6a8ae2d3f19c
Zhu, Sheng
0c71d889-2dbe-4bcc-add0-02e00d93cc77
Feng, Yutong
8257a816-5e4a-47bc-8aa2-e364c4d6e21e
Srinivasan, Balaji
b04f794d-be0c-41d1-98e6-791458fb2eba
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Pidishety, Shankar
b693fa46-8454-4577-8166-6a8ae2d3f19c
Zhu, Sheng
0c71d889-2dbe-4bcc-add0-02e00d93cc77
Feng, Yutong
8257a816-5e4a-47bc-8aa2-e364c4d6e21e
Srinivasan, Balaji
b04f794d-be0c-41d1-98e6-791458fb2eba
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b

Pidishety, Shankar, Zhu, Sheng, Feng, Yutong, Srinivasan, Balaji and Nilsson, Johan (2019) Raman amplification of optical beam carrying orbital angular momentum in a multimode step-index fiber. Optics Letters, 44 (7), 1658-1661. (doi:10.1364/OL.44.001658).

Record type: Article

Abstract

We experimentally demonstrate 15 dB of Raman amplification of 1115 nm pulses in an orbital angular momentum mode (OAMM) with charge l 2, S 1 in 5 m of step-index 25 μm-diameter-core fiber. The total output reaches 4.5 kW of peak power and 68.5 μJ of energy in ∼15 ns pulses at 4 kHz repetition rate. An Yb-doped fiber source pumps the Raman amplifier at 1060 nm with 60 ns pulses. Using a spatial light modulator for modal decomposition, we measure 83% purity for the amplified target OAMM of selected polarization. To the best of our knowledge, this is the first time high energy, peak power, gain, and purity are achieved in a fiber Raman amplifier for a single OAMM.

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More information

Accepted/In Press date: 26 February 2019
e-pub ahead of print date: 26 February 2019
Published date: 22 March 2019

Identifiers

Local EPrints ID: 431410
URI: https://eprints.soton.ac.uk/id/eprint/431410
ISSN: 0146-9592
PURE UUID: 45618da5-a7b7-46d7-809f-53f0e4eed538
ORCID for Johan Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

Catalogue record

Date deposited: 31 May 2019 16:30
Last modified: 10 Dec 2019 01:51

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Contributors

Author: Sheng Zhu
Author: Yutong Feng
Author: Balaji Srinivasan
Author: Johan Nilsson ORCID iD

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