Dynamics of coupled modes in two-section semiconductor lasers with saturable absorption

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dc.contributor.advisor O'Brien, Stephen en
dc.contributor.advisor O'Reilly, Eoin P. en
dc.contributor.author O'Callaghan, Finbarr
dc.date.accessioned 2016-11-01T12:19:23Z
dc.date.available 2016-11-01T12:19:23Z
dc.date.issued 2015
dc.date.submitted 2015
dc.identifier.citation O'Callaghan, F. 2015. Dynamics of coupled modes in two-section semiconductor lasers with saturable absorption. PhD Thesis, University College Cork. en
dc.identifier.endpage 110 en
dc.identifier.uri http://hdl.handle.net/10468/3229
dc.description.abstract Semiconductor lasers have the potential to address a number of critical applications in advanced telecommunications and signal processing. These include applications that require pulsed output that can be obtained from self-pulsing and mode-locked states of two-section devices with saturable absorption. Many modern applications place stringent performance requirements on the laser source, and a thorough understanding of the physical mechanisms underlying these pulsed modes of operation is therefore highly desirable. In this thesis, we present experimental measurements and numerical simulations of a variety of self-pulsation phenomena in two-section semiconductor lasers with saturable absorption. Our theoretical and numerical results will be based on rate equations for the field intensities and the carrier densities in the two sections of the device, and we establish typical parameter ranges and assess the level of agreement with experiment that can be expected from our models. For each of the physical examples that we consider, our model parameters are consistent with the physical net gain and absorption of the studied devices. Following our introductory chapter, the first system that we consider is a two-section Fabry-Pérot laser. This example serves to introduce our method for obtaining model parameters from the measured material dispersion, and it also allows us to present a detailed discussion of the bifurcation structure that governs the appearance of selfpulsations in two-section devices. In the following two chapters, we present two distinct examples of experimental measurements from dual-mode two-section devices. In each case we have found that single mode self-pulsations evolve into complex coupled dualmode states following a characteristic series of bifurcations. We present optical and mode resolved power spectra as well as a series of characteristic intensity time traces illustrating this progression for each example. Using the results from our study of a twosection Fabry-Pérot device as a guide, we find physically appropriate model parameters that provide qualitative agreement with our experimental results. We highlight the role played by material dispersion and the underlying single mode self-pulsing orbits in determining the observed dynamics, and we use numerical continuation methods to provide a global picture of the governing bifurcation structure. In our concluding chapter we summarise our work, and we discuss how the presented results can inform the development of optimised mode-locked lasers for performance applications in integrated optics. en
dc.description.sponsorship Science Foundation Ireland (SFI Grant 13/IF/I2785) en
dc.format.mimetype application/pdf en
dc.language English en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2015, Finbarr O'Callaghan. en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ en
dc.subject Semiconductor en
dc.subject Laser en
dc.subject Dynamics en
dc.subject Absorption en
dc.subject Absorption en
dc.subject Two-section en
dc.title Dynamics of coupled modes in two-section semiconductor lasers with saturable absorption en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en
dc.check.info No embargo required en
dc.description.version Accepted Version
dc.contributor.funder Science Foundation Ireland en
dc.description.status Not peer reviewed en
dc.internal.school Physics en
dc.internal.school Tyndall National Institute en
dc.check.type No Embargo Required
dc.check.reason No embargo required en
dc.check.opt-out No en
dc.thesis.opt-out false
dc.check.embargoformat Not applicable en
ucc.workflow.supervisor bryan.kelleher@ucc.ie
dc.internal.conferring Autumn 2016 en

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© 2015, Finbarr O'Callaghan. Except where otherwise noted, this item's license is described as © 2015, Finbarr O'Callaghan.
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