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 |
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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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