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Spatial Control of Nonlinear Interactions in Multimode Fibers
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
키워드  
Wavefront shaping
키워드  
Transverse mode instability
기타저자  
Yale University Physics
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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MARC

 008260126s2025        us                              c    eng  d
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■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.

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