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Spatial Control of Nonlinear Interac...

Wisal, Kabish,

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Spatial Control of Nonlinear Interactions in Multimode Fibers /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Spatial Control of Nonlinear Interactions in Multimode Fibers // Kabish Wisal.
作者:	Wisal, Kabish,
面頁冊數:	1 electronic resource (263 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
Contained By:	Dissertations Abstracts International86-12B.
標題:	Physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31846033
ISBN:	9798286442331

Spatial Control of Nonlinear Interactions in Multimode Fibers /
Wisal, Kabish,

Spatial Control of Nonlinear Interactions in Multimode Fibers /Kabish Wisal. - 1 electronic resource (263 pages)

Source: Dissertations Abstracts International, Volume: 86-12, Section: B.

In recent years, there has been significant advancement in controlling optical scattering by structuring the wavefront of the incident light, or 'wavefront shaping'. Most applications of wavefront shaping have focused on linear scattering, but there is a growing interest in tailoring nonlinear scattering. In this thesis, we explore a new approach based on wavefront shaping for suppressing certain instabilities induced by nonlinear scattering in passive and active multimode fibers (MMFs). Specifically, we focus on suppressing stimulated Brillouin scattering (SBS) and transverse mode instability (TMI). A key motivation for our work is power scaling in high power fiber lasers and amplifiers, which has been primarily limited by SBS and TMI.SBS is caused by nonlinear acousto-optic scattering, and can lead to undesirable backreflection above a certain power threshold. Whereas, TMI leads to fluctuations in the output beam profile due to nonlinear thermo-optical scattering. Previous efforts to suppress SBS and TMI have primarily utilized single mode fibers, driven by their smooth gaussian output beam profile. In contrast, we utilize wavefront shaping of coherent light to selectively excite multiple modes in an MMF, which we show allows suppression of SBS and TMI, while simultaneously controlling the output beam profile.We develop new theories and computational models of SBS and TMI for highly multimode excitations in passive and active MMFs. Our theories predict mitigation of both SBS and TMI upon generic multimode excitations. The results for SBS suppression are confirmed experimentally in both passive and active fibers, while predictions for TMI mitigation are validated with numerical simulations. We also develop an optimization framework to find the optimal input wavefronts for maximal SBS and TMI suppression, both individually and jointly. Finally, we provide a theoretical proof for the existence of an input wavefront to obtain any given output in an MMF amplifier with dissipation and nonlinear scattering. Our work creates a new avenue for generating ultra-high continuous-wave laser power with a narrow linewidth, enabling applications in gravitational wave detection, advanced manufacturing and directed-energy delivery.

English

ISBN: 9798286442331Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Fiber lasers

Spatial Control of Nonlinear Interactions in Multimode Fibers /
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520 $a In recent years, there has been significant advancement in controlling optical scattering by structuring the wavefront of the incident light, or 'wavefront shaping'. Most applications of wavefront shaping have focused on linear scattering, but there is a growing interest in tailoring nonlinear scattering. In this thesis, we explore a new approach based on wavefront shaping for suppressing certain instabilities induced by nonlinear scattering in passive and active multimode fibers (MMFs). Specifically, we focus on suppressing stimulated Brillouin scattering (SBS) and transverse mode instability (TMI). A key motivation for our work is power scaling in high power fiber lasers and amplifiers, which has been primarily limited by SBS and TMI.SBS is caused by nonlinear acousto-optic scattering, and can lead to undesirable backreflection above a certain power threshold. Whereas, TMI leads to fluctuations in the output beam profile due to nonlinear thermo-optical scattering. Previous efforts to suppress SBS and TMI have primarily utilized single mode fibers, driven by their smooth gaussian output beam profile. In contrast, we utilize wavefront shaping of coherent light to selectively excite multiple modes in an MMF, which we show allows suppression of SBS and TMI, while simultaneously controlling the output beam profile.We develop new theories and computational models of SBS and TMI for highly multimode excitations in passive and active MMFs. Our theories predict mitigation of both SBS and TMI upon generic multimode excitations. The results for SBS suppression are confirmed experimentally in both passive and active fibers, while predictions for TMI mitigation are validated with numerical simulations. We also develop an optimization framework to find the optimal input wavefronts for maximal SBS and TMI suppression, both individually and jointly. Finally, we provide a theoretical proof for the existence of an input wavefront to obtain any given output in an MMF amplifier with dissipation and nonlinear scattering. Our work creates a new avenue for generating ultra-high continuous-wave laser power with a narrow linewidth, enabling applications in gravitational wave detection, advanced manufacturing and directed-energy delivery.
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650 4 $a Optics. $3 517925
650 4 $a Biomedical engineering. $3 535387
650 4 $a Medical imaging. $3 3172799
653 $a Fiber lasers
653 $a Multimode fibers
653 $a Nonlinear optics
653 $a Wavefront shaping
653 $a Transverse mode instability
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690 $a 0752
690 $a 0574
690 $a 0541
710 2 $a Yale University. $b Physics. $e degree granting institution. $3 3824119
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