Frequency noise stabilisation of a 1550 nm external cavity diode laser with hybrid feedback for next generation gravitational wave interferometry

Spencer, A. , Barr, B. , Bell, A. , Briggs, J., Minty, A., Sorazu, B. , Wright, J. and Strain, K. (2022) Frequency noise stabilisation of a 1550 nm external cavity diode laser with hybrid feedback for next generation gravitational wave interferometry. Optics Express, 30(13), pp. 22687-22699. (doi: 10.1364/OE.459474) (PMID:36224961)

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Abstract

Longer wavelength lasers will be needed for future gravitational wave detectors that use cryogenic cooling of silicon based test-mass optics. Diode lasers with a 1550 nm wavelength output are potential seed light sources for such a detector, however diode laser devices have a different spectral profile and higher frequency noise than the solid state lasers used in current detectors. We present a frequency stabilisation system for a 1550 nm external cavity diode laser capable of reducing the laser frequency noise to a level of 0.1HzHz√ up to 1 kHz with a unity gain frequency of 535 kHz using a hybrid analogue-digital servo with in-loop cancellation of resonant features. In addition, a method of high speed digital filter optimisation and automated design is demonstrated.

Item Type:Articles
Additional Information:This work was supported by the Science and Technology Facilities Council (Grant ref: ST/N005422/1) and A. Spencer was supported by STFC Studentship award number 1653071. This paper has LIGO document number P2000321.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:WRIGHT, Jennifer and Spencer, Dr Andrew and Bell, Dr Angus and Briggs, Mr Joseph and Barr, Dr Bryan and Sorazu Lucio, Dr Borja and Strain, Professor Kenneth
Authors: Spencer, A., Barr, B., Bell, A., Briggs, J., Minty, A., Sorazu, B., Wright, J., and Strain, K.
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Centre:College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN:1094-4087
ISSN (Online):1094-4087
Published Online:17 June 2022
Copyright Holders:Copyright © 2022 Optics Express
First Published:First published in Optics Express 30(13):22687-22699
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
173808Investigations in gravitational radiationSheila RowanScience and Technology Facilities Council (STFC)ST/N005422/1P&S - Physics & Astronomy