Mode-locked fibre lasers for ultrafast gyroscopic measurements


Modern applications are constantly pushing the limits of current technologies, requiring further improvements in their precision. The advances in laser development significantly contribute to the achievements of modern technologies. One of the niches of precision technologies is gyroscopic measurements, where laser-based gyroscopes deliver unparalleled accuracy. Nonetheless, laser gyroscopes are subjected to the general limitation as ’lock-in’ effect, which restricts the lowest measurable angular velocity. The usage of pulsed laser sources, such as mode-locked lasers, can mitigate this deleterious effect and benefit the laser gyroscope development.The extensive studying of ultrafast lasers over the last few decades significantly improved their performance, extending their applications to extremely precise measurements such as optical clocks and telescope calibration. However, the usage of ultrafast lasers for the detection of angular rotations is still rudimentary and requires further studies. In this manuscript, our goal is to contribute to the scientific achievements in the area of ultrashort pulses interferometry and, in particular, gyroscopic applications. We aim to deliver novel approaches for phase measurements at high data frequencies by using the recent advances in fast electronics and ultrafast measurement techniques. Firstly, we study bidirectional mode-locked fibre laser and its applicability for the detection of angular movements. Indicating the main obstacles to achieve continuous reliable results, in the following chapter we propose another interferometric setup, which provides the measurements of the pulse-to-pulse phase drift and can be used to characterise the phase noise of a pulse train or being exploited for interferometry. Finally, we demonstrate a passive gyro setup based on interferometric measurements, which inherits all the benefits of the usage of ultrashort pulses, while the phase noises of the laser source are significantly mitigated. We conclude that ultrashort pulses can benefit many phase-based applications, which require high resolution and high data rates, including but not limited to gyroscopic measurements.

Additional Information: (c) Igor Kudelin, 2021. Igor Kudelin asserts his moral right to be identified as the author of this thesis. This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rests with its author and that no quotation from the thesis and no information derived from it may be published without appropriate permission or acknowledgement. If you have discovered material in Aston Publications Explorer which is unlawful e.g. breaches copyright, (either yours or that of a third party) or any other law, including but not limited to those relating to patent, trademark, confidentiality, data protection, obscenity, defamation, libel, then please read our Takedown Policy and contact the service immediately.
Institution: Aston University
Uncontrolled Keywords: Laser gyroscope,fibre laser,mode-locking,ultrashort pulses,Dispersive Fourier Transformation
Last Modified: 08 Dec 2023 08:58
Date Deposited: 02 Feb 2022 17:27
Completed Date: 2021-09
Authors: Kudelin, Igor (ORCID Profile 0000-0002-5892-8544)

Export / Share Citation


Additional statistics for this record