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Stimulated Raman amplification in Ga As/Al As intermixed superlattices

Stimulated Raman amplification in Ga As/Al As intermixed superlattices
Stimulated Raman amplification in Ga As/Al As intermixed superlattices
We show the effectiveness of a χ(3)-quasi-phase-matched structure made of a GaAs/AlAs inter-mixed superlattice in stimulated Raman amplification for an enhancement in the output efficiency of anti-Stokes waves, where the efficiency is originally extremely small due to a phase mismatch for the anti-Stokes waves (although the output efficiency of Stokes waves is sufficiently large because of no such phase mismatch). We demonstrate that our quasi-phase matched structure enhances the anti-Stokes output efficiency up to the order of 103 when compared with that without the quasi-phase matched structure, particularly at a small pump intensity. Here, the effects of four-wave mixing, self- and cross-phase modulations are included in addition to Raman amplification with linear optical losses. In this efficiency enhancement, we see that the output efficiency of the anti-Stokes waves is boosted via simultaneous four-wave mixing. Moreover, we show how much the effects of the self- and cross-phase-modulations degrade this efficiency enhancement. With all those effects taken into account, we show that there is an optimal superlattice length that provides the highest efficiency. In addition, we analyze the efficiency degradation due to two-photon absorption, and point out that in order to keep the highest efficiency at the optimal length, the Stokes, anti-Stokes, and pump wavelengths should be set larger than the half-bandgap wavelength of the intermixed superlattice.
1
Tomita, Isao
e4a78ed2-f525-4fb0-9711-86e2b2dd5587
Saito, Shinichi
14a5d20b-055e-4f48-9dda-267e88bd3fdc
Hutchings, David
0d7772d0-9a17-452b-b2a9-bb8efbfb06cf
Tomita, Isao
e4a78ed2-f525-4fb0-9711-86e2b2dd5587
Saito, Shinichi
14a5d20b-055e-4f48-9dda-267e88bd3fdc
Hutchings, David
0d7772d0-9a17-452b-b2a9-bb8efbfb06cf

Tomita, Isao, Saito, Shinichi and Hutchings, David (2018) Stimulated Raman amplification in Ga As/Al As intermixed superlattices. Physical Review Applied, 10 (6), 1, [064005]. (doi:10.1103/PhysRevApplied.10.064005).

Record type: Article

Abstract

We show the effectiveness of a χ(3)-quasi-phase-matched structure made of a GaAs/AlAs inter-mixed superlattice in stimulated Raman amplification for an enhancement in the output efficiency of anti-Stokes waves, where the efficiency is originally extremely small due to a phase mismatch for the anti-Stokes waves (although the output efficiency of Stokes waves is sufficiently large because of no such phase mismatch). We demonstrate that our quasi-phase matched structure enhances the anti-Stokes output efficiency up to the order of 103 when compared with that without the quasi-phase matched structure, particularly at a small pump intensity. Here, the effects of four-wave mixing, self- and cross-phase modulations are included in addition to Raman amplification with linear optical losses. In this efficiency enhancement, we see that the output efficiency of the anti-Stokes waves is boosted via simultaneous four-wave mixing. Moreover, we show how much the effects of the self- and cross-phase-modulations degrade this efficiency enhancement. With all those effects taken into account, we show that there is an optimal superlattice length that provides the highest efficiency. In addition, we analyze the efficiency degradation due to two-photon absorption, and point out that in order to keep the highest efficiency at the optimal length, the Stokes, anti-Stokes, and pump wavelengths should be set larger than the half-bandgap wavelength of the intermixed superlattice.

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In preparation date: 11 September 2017
Accepted/In Press date: 12 October 2018
e-pub ahead of print date: 4 December 2018
Published date: December 2018

Identifiers

Local EPrints ID: 426448
URI: http://eprints.soton.ac.uk/id/eprint/426448
PURE UUID: a5b82055-8e13-44ff-8b95-494d61e955d6
ORCID for Shinichi Saito: ORCID iD orcid.org/0000-0003-1539-1182

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Date deposited: 27 Nov 2018 17:30
Last modified: 07 Oct 2020 03:36

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