High bandwidth frequency modulation of an external cavity diode laser using an intracavity lithium niobate electro-optic modulator as output coupler

S. Palmer; A. Boes; G. Ren; T. G. Nguyen; S. J. Tempone-Wiltshire; N. Longhurst; P. M. Farrell; A. Steiner; Ch. D. Marciniak; T. Monz; A. Mitchell; R. E. Scholten

doi:10.1063/5.0097880

APL Photonics (Aug 2022)

High bandwidth frequency modulation of an external cavity diode laser using an intracavity lithium niobate electro-optic modulator as output coupler

S. Palmer,
A. Boes,
G. Ren,
T. G. Nguyen,
S. J. Tempone-Wiltshire,
N. Longhurst,
P. M. Farrell,
A. Steiner,
Ch. D. Marciniak,
T. Monz,
A. Mitchell,
R. E. Scholten

Affiliations

S. Palmer: Integrated Photonics and Applications Centre (InPAC), School of Engineering, RMIT University, Melbourne 3000, Australia
A. Boes: Integrated Photonics and Applications Centre (InPAC), School of Engineering, RMIT University, Melbourne 3000, Australia
G. Ren: Integrated Photonics and Applications Centre (InPAC), School of Engineering, RMIT University, Melbourne 3000, Australia
T. G. Nguyen: Integrated Photonics and Applications Centre (InPAC), School of Engineering, RMIT University, Melbourne 3000, Australia
S. J. Tempone-Wiltshire: MOGLabs, Carlton 3053, Australia
N. Longhurst: MOGLabs, Carlton 3053, Australia
P. M. Farrell: MOGLabs, Carlton 3053, Australia
A. Steiner: Institut für Experimentalphysik, 6020 Innsbruck, Austria
Ch. D. Marciniak: Institut für Experimentalphysik, 6020 Innsbruck, Austria
T. Monz: Institut für Experimentalphysik, 6020 Innsbruck, Austria
A. Mitchell: Integrated Photonics and Applications Centre (InPAC), School of Engineering, RMIT University, Melbourne 3000, Australia
R. E. Scholten: MOGLabs, Carlton 3053, Australia

DOI: https://doi.org/10.1063/5.0097880
Journal volume & issue: Vol. 7, no. 8
pp. 086106 – 086106-6

Abstract

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We present a novel approach to high bandwidth laser frequency modulation. A lithium niobate chip is used as an intracavity electro-optic modulator in a tunable cateye external cavity diode laser. The modulator is conveniently integrated with the cateye output coupler, providing a unique approach to high bandwidth frequency stabilization and linewidth narrowing. The intracavity modulator feedback was successfully operated below 1 V and achieved superior frequency noise suppression compared to conventional feedback through diode injection current modulation. A closed loop bandwidth of 1.8 MHz was demonstrated, and the laser linewidth reduced to around 1 Hz as measured by the heterodyne measurement.

Published in APL Photonics

ISSN: 2378-0967 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website: https://aplphotonics.aip.org

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