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Spatial Control of Nonlinear Interactions in Multimode Fibers
Spatial Control of Nonlinear Interactions in Multimode Fibers
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103033
- ISBN
- 9798286442331
- DDC
- 530
- 저자명
- Wisal, Kabish.
- 서명/저자
- Spatial Control of Nonlinear Interactions in Multimode Fibers
- 발행사항
- [Sl] : Yale University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 263 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
- 주기사항
- Advisor: Stone, A. Douglas.
- 학위논문주기
- Thesis (Ph.D.)--Yale University, 2025.
- 초록/해제
- 요약In 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.
- 일반주제명
- Physics
- 일반주제명
- Optics
- 일반주제명
- Biomedical engineering
- 일반주제명
- Medical imaging
- 키워드
- Fiber lasers
- 키워드
- Multimode fibers
- 키워드
- Nonlinear optics
- 기타저자
- Yale University Physics
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017356779
■00520260202103033
■006m o d
■007cr#unu||||||||
■020 ▼a9798286442331
■035 ▼a(MiAaPQ)AAI31846033
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aWisal, Kabish.
■24510▼aSpatial Control of Nonlinear Interactions in Multimode Fibers
■260 ▼a[Sl]▼bYale University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a263 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-12, Section: B.
■500 ▼aAdvisor: Stone, A. Douglas.
■5021 ▼aThesis (Ph.D.)--Yale University, 2025.
■520 ▼aIn 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.
■590 ▼aSchool code: 0265.
■650 4▼aPhysics
■650 4▼aOptics
■650 4▼aBiomedical engineering
■650 4▼aMedical imaging
■653 ▼aFiber lasers
■653 ▼aMultimode fibers
■653 ▼aNonlinear optics
■653 ▼aWavefront shaping
■653 ▼aTransverse mode instability
■690 ▼a0605
■690 ▼a0752
■690 ▼a0574
■690 ▼a0541
■71020▼aYale University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-12B.
■790 ▼a0265
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356779▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


