The University of Southampton
University of Southampton Institutional Repository

Generation of multi-gigahertz trains of phase-coherent femtosecond laser pulses in Ti:sapphire waveguides

Generation of multi-gigahertz trains of phase-coherent femtosecond laser pulses in Ti:sapphire waveguides
Generation of multi-gigahertz trains of phase-coherent femtosecond laser pulses in Ti:sapphire waveguides
Miniature lasers producing ultrashort phase-coherent pulses at high repetition rates by stable mode-locking in ambient conditions can offer unique capabilities in various applications, spanning from microwave photonics to telecom and biological imaging techniques. Here, the operation of graphene mode-locked lasers based on channel waveguides written by femtosecond and picosecond laser pulses in Ti:sapphire crystals is demonstrated. Trains of pulses of 41.4-fs duration at a 21.25-GHz repetition rate were generated by capitalizing on the formation of solitons in their monolithic resonators through Gires–Tournois interferometers. The latter, allow for effective pulse shaping via tuning of the intracavity group delay dispersion while simultaneously enabling ultralow laser operating thresholds. A number of features of these sources, including their high-brightness and broad bandwidth, are essential ingredients for achieving high longitudinal resolution and sensitivity, which are the primary performance metrics of the Fourier domain/spectral domain variant of optical coherence tomography systems. A further doubling of the laser repetition rate to 42.5 GHz was achieved by coherent pulse interleaving in optical fiber technology, thereby underlining the potential of the Ti:sapphire waveguide lasers to produce highly stable, wide-spaced combs of phase-coherent optical frequency lines.
1863-8880
Grivas, Christos
7f564818-0ac0-4127-82a7-22e87ac35f1a
Ismaeel, Rand
c1fb0984-a4c0-484a-8aef-625d48a62086
Corbari, Costantino
273904e8-5f90-4110-bc17-3d3f2c27d461
Huang, Chung-Che
825f7447-6d02-48f6-b95a-fa33da71f106
Hewak, Daniel
87c80070-c101-4f7a-914f-4cc3131e3db0
Lagoudakis, Pavlos
ea50c228-f006-4edf-8459-60015d961bbf
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Grivas, Christos
7f564818-0ac0-4127-82a7-22e87ac35f1a
Ismaeel, Rand
c1fb0984-a4c0-484a-8aef-625d48a62086
Corbari, Costantino
273904e8-5f90-4110-bc17-3d3f2c27d461
Huang, Chung-Che
825f7447-6d02-48f6-b95a-fa33da71f106
Hewak, Daniel
87c80070-c101-4f7a-914f-4cc3131e3db0
Lagoudakis, Pavlos
ea50c228-f006-4edf-8459-60015d961bbf
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8

Grivas, Christos, Ismaeel, Rand, Corbari, Costantino, Huang, Chung-Che, Hewak, Daniel, Lagoudakis, Pavlos and Brambilla, Gilberto (2018) Generation of multi-gigahertz trains of phase-coherent femtosecond laser pulses in Ti:sapphire waveguides. Laser & Photonics Reviews. (doi:10.1002/lpor.201800167).

Record type: Article

Abstract

Miniature lasers producing ultrashort phase-coherent pulses at high repetition rates by stable mode-locking in ambient conditions can offer unique capabilities in various applications, spanning from microwave photonics to telecom and biological imaging techniques. Here, the operation of graphene mode-locked lasers based on channel waveguides written by femtosecond and picosecond laser pulses in Ti:sapphire crystals is demonstrated. Trains of pulses of 41.4-fs duration at a 21.25-GHz repetition rate were generated by capitalizing on the formation of solitons in their monolithic resonators through Gires–Tournois interferometers. The latter, allow for effective pulse shaping via tuning of the intracavity group delay dispersion while simultaneously enabling ultralow laser operating thresholds. A number of features of these sources, including their high-brightness and broad bandwidth, are essential ingredients for achieving high longitudinal resolution and sensitivity, which are the primary performance metrics of the Fourier domain/spectral domain variant of optical coherence tomography systems. A further doubling of the laser repetition rate to 42.5 GHz was achieved by coherent pulse interleaving in optical fiber technology, thereby underlining the potential of the Ti:sapphire waveguide lasers to produce highly stable, wide-spaced combs of phase-coherent optical frequency lines.

Text
Generation of multi-gigahertz trains - Accepted Manuscript
Restricted to Repository staff only until 27 August 2019.
Request a copy

More information

Accepted/In Press date: 27 August 2018
e-pub ahead of print date: 19 September 2018

Identifiers

Local EPrints ID: 423769
URI: https://eprints.soton.ac.uk/id/eprint/423769
ISSN: 1863-8880
PURE UUID: 46144e1c-b06b-48ee-bb20-6fd03f6b1004
ORCID for Chung-Che Huang: ORCID iD orcid.org/0000-0003-3471-2463
ORCID for Daniel Hewak: ORCID iD orcid.org/0000-0002-2093-5773

Catalogue record

Date deposited: 01 Oct 2018 16:30
Last modified: 14 Mar 2019 01:53

Export record

Altmetrics

Contributors

Author: Christos Grivas
Author: Rand Ismaeel
Author: Costantino Corbari
Author: Chung-Che Huang ORCID iD
Author: Daniel Hewak ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×