Frequency combs on chip for interferometry applications
2022 (English)Licentiate thesis, monograph (Other academic)
Abstract [en]
Optical frequency combs have revolutionized the field of laser spectroscopy. A frequency comb is a type of laser that generates an array of equally spaced coherent laser lines. Indeed, the outstanding performance of frequency combs in terms of bandwidth and stability is readily attainable in bench-top systems. Integrated photonics offers a platform for the implementation of frequency combs relying on nonlinear optics processes. This thesis explores the generation of chip-scale frequency combs based on supercontinuum and microcomb generation and its potential use for interferometry. This investigation covers the capabilities offered by supercontinuum generation in the normal dispersion regime. The spectral broadening is realized by pumping a straight waveguide with a short duration pulse meaning that the pump is a comb itself. Therefore, its performance in terms of coherence and the transferring of noise to the broadened spectra have been investigated. Microcombs can be generated on a microresonator starting from a continuous wave laser. In this work, we study microcomb generation in the normal dispersion regime using a novel dual-cavity architecture. The appended papers describe the nonlinear processes involved in the microcomb generation. We have studied its capabilities in terms of spectral flatness and symmetry, together with the coherence attained on these combs. It is found that these capabilities make microcombs a suitable spectral sources for spectroscopy. Furthermore, the capabilities of different interferometry techniques are analyzed in terms of resolution, sensitivity and measurement time in order to perform on-chip dual-comb spectroscopy.
Place, publisher, year, edition, pages
Gothenburg, 2022. , p. 68
Series
Technical report MC2 - Department of Microtechnology and Nanoscience, Chalmers University of Technology: 452, ISSN 1652-0769
Keywords [en]
optical frequency combs, microcombs, pulses, nonlinear optics, interferometry, integrated photonics, spectroscopy
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:ri:diva-60327OAI: oai:DiVA.org:ri-60327DiVA, id: diva2:1703129
Presentation
2022-06-17, 13:00
Opponent
Supervisors
Note
Research Project: Dark-Soliton Engineering in Microresonator Frequency Combs (DarkComb)European Commission (EC) (EC/H2020/771410), 2018-05-01 -- 2023-04-30.
This thesis is based on the work contained in the following papers: [A] Israel Rebolledo-Salgado, Zhichao Ye, Simon Christensen, FuchuanLei, Krishna Twayana, Jochen Schröder, Martin Zelan, and Victor Torres-Company, “Coherent supercontinuum generation in all normal dispersion Si3N4 waveguides”, Optics Express, 30, 8641-8651, 2022. [B] Israel Rebolledo-Salgado1, Óskar B. Helgason, Zhichao Ye, JochenSchröder, Martin Zelan, and Victor Torres-Company, “Photonicmolecule microcombs at 50 GHz repetition rate”, Conference onLasers and Electro-Optics, San Jose, USA, paper SW4O.8, 2022. [C] Krishna Twayana, Israel Rebolledo-Salgado, Ekaterina Deriushkina, Jochen Schröder, Magnus Karlsson and Victor Torres-Company,“Frequency-comb-based spectral interferometry for characterizationof photonic devices”, Micromachines, 13, no 4, p. 614, 2022.Related publications and conference contributions by the author, notincluded in the thesis): [D] I. Rebolledo-Salgado, Z. Ye, S. Christensen, F. Lei, J.Schröder, M.Zelan, V. Torres-Company “Nonlinear Broadeningof Electro-Optic Frequency Combs in All-Normal DispersionSi3N4 Waveguides”, Proceedings of Conference on Lasers andElectro-Optics Europe/ European Quantum Electronics Conference(CLEO/Europe-EQEC),2021, pp. 1-4 [E] E. Deriushkina, I. Rebolledo-Salgado, M. Mazur, V. TorresCompany, P. Andrekson, S. Gross, M.J Withford, T. Hayash,T. Nagashima, J. Schröder, M. Karlsson “Characterisation of avCoupled-Core Fiber Using Dual-Comb Swept-Wavelength Interferometry” Proceedings of European Conference on Optical Communication (ECOC),2021, pp. 1-1
2022-10-132022-10-122023-05-25Bibliographically approved