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10 Gigahertz Electro-Optic Combs Spanning Ultraviolet-Visible to Mid-Infrared
10 Gigahertz Electro-Optic Combs Spanning Ultraviolet-Visible to Mid-Infrared
10 Gigahertz Electro-Optic Combs Spanning Ultraviolet-Visible to Mid-Infrared

Detailed Information

Material Type  
 단행본
 
0017359001
Date and Time of Latest Transaction  
20260202104820
ISBN  
9798291578339
DDC  
530
Author  
Sekhar, Pooja.
Title/Author  
10 Gigahertz Electro-Optic Combs Spanning Ultraviolet-Visible to Mid-Infrared
Publish Info  
[Sl] : University of Colorado at Boulder, 2025
Publish Info  
Ann Arbor : ProQuest Dissertations & Theses, 2025
Material Info  
194 p
General Note  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
General Note  
Advisor: Diddams, Scott A.
학위논문주기  
Thesis (Ph.D.)--University of Colorado at Boulder, 2025.
Abstracts/Etc  
요약The development of laser frequency combs (LFC) with tens of gigahertz (GHz) mode spacing and engineered spectral extension into the near ultraviolet (UV)-visible and mid-infrared (MIR) regimes is driven by the growing demands of astronomical spectroscopy and sensing. This thesis presents our efforts to address key calibration challenges in radial velocity (RV) spectroscopy-specifically, the limited spectral coverage of LFCs in the UV-visible, limited frequency tunability for detector characterization, and the high cost and complexity of current systems. To this end, this work investigates fiber-integrated resonant electro-optic combs (REOCs) as a simple, cost-effective alternative for generating high-repetition-rate combs, with a focus on understanding their unique phase noise properties. The femtosecond pulses generated from these 10 GHz combs using mature fiber technology in telecommunications industry are launched into a new nanophotonic waveguide platform, chirped periodically poled thin-film lithium niobate (TFLN), to generate frequency combs spanning the critical 350 - 550 nm wavelength region. Leveraging dispersion engineering, third-order and enhanced second-order nonlinearities via quasi-phase matching in TFLN platform, we achieve multi-octave spanning frequency comb at sub-100 picojoule pulse energies. This work also includes the first demonstrations of UV-visible harmonic combs at 10 GHz repetition rates, supported by numerical modeling and waveguide design strategies aimed at achieving gap-free spectral coverage across the near UV-visible band. In the MIR regime, 10-20 GHz combs generated from EO, microcomb, and mode-locked laser sources at 1550 nm are spectrally broadened and downconverted using a hybrid platform combining highly nonlinear fiber and LN waveguides. Intra-pulse difference frequency generation is employed to extend the spectrum into the MIR or molecular fingerprint region, with ongoing efforts to fully miniaturize the spectrometer system on a TFLN chip for high-speed spectroscopy applications. Finally, this work introduces frequency and intensity tunability to static comb sources, transforming them into dynamic metrological tools. This capability along with the near ultraviolet-visible spectral coverage enables precise characterization and wavelength calibration of large-format detector arrays-an essential step toward achieving centimeter-per-second radial velocity precision required to detect Earth-Sun analogs.
Subject Added Entry-Topical Term  
Physics
Subject Added Entry-Topical Term  
Optics
Subject Added Entry-Topical Term  
Analytical chemistry
Subject Added Entry-Topical Term  
Nanoscience
Index Term-Uncontrolled  
Dispersion engineering
Index Term-Uncontrolled  
Integrated nanophotonic waveguides
Index Term-Uncontrolled  
Laser frequency combs
Index Term-Uncontrolled  
Nonlinear optics
Index Term-Uncontrolled  
Precision astronomical spectroscopy
Added Entry-Corporate Name  
University of Colorado at Boulder Physics
Host Item Entry  
Dissertations Abstracts International. 87-02B.
Electronic Location and Access  
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MARC

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■1001  ▼aSekhar,  Pooja.▼0(orcid)0000-0002-1777-4382
■24510▼a10  Gigahertz  Electro-Optic  Combs  Spanning  Ultraviolet-Visible  to  Mid-Infrared
■260    ▼a[Sl]▼bUniversity  of  Colorado  at  Boulder▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a194  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Diddams,  Scott  A.
■5021  ▼aThesis  (Ph.D.)--University  of  Colorado  at  Boulder,  2025.
■520    ▼aThe  development  of  laser  frequency  combs  (LFC)  with  tens  of  gigahertz  (GHz)  mode  spacing  and  engineered  spectral  extension  into  the  near  ultraviolet  (UV)-visible  and  mid-infrared  (MIR)  regimes  is  driven  by  the  growing  demands  of  astronomical  spectroscopy  and  sensing.  This  thesis  presents  our  efforts  to  address  key  calibration  challenges  in  radial  velocity  (RV)  spectroscopy-specifically,  the  limited  spectral  coverage  of  LFCs  in  the  UV-visible,  limited  frequency  tunability  for  detector  characterization,  and  the  high  cost  and  complexity  of  current  systems.  To  this  end,  this  work  investigates  fiber-integrated  resonant  electro-optic  combs  (REOCs)  as  a  simple,  cost-effective  alternative  for  generating  high-repetition-rate  combs,  with  a  focus  on  understanding  their  unique  phase  noise  properties.  The  femtosecond  pulses  generated  from  these  10  GHz  combs  using  mature  fiber  technology  in  telecommunications  industry  are  launched  into  a  new  nanophotonic  waveguide  platform,  chirped  periodically  poled  thin-film  lithium  niobate  (TFLN),  to  generate  frequency  combs  spanning  the  critical  350  -  550  nm  wavelength  region.  Leveraging  dispersion  engineering,  third-order  and  enhanced  second-order  nonlinearities  via  quasi-phase  matching  in  TFLN  platform,  we  achieve  multi-octave  spanning  frequency  comb  at  sub-100  picojoule  pulse  energies.  This  work  also  includes  the  first  demonstrations  of  UV-visible  harmonic  combs  at  10  GHz  repetition  rates,  supported  by  numerical  modeling  and  waveguide  design  strategies  aimed  at  achieving  gap-free  spectral  coverage  across  the  near  UV-visible  band.  In  the  MIR  regime,  10-20  GHz  combs  generated  from  EO,  microcomb,  and  mode-locked  laser  sources  at  1550  nm  are  spectrally  broadened  and  downconverted  using  a  hybrid  platform  combining  highly  nonlinear  fiber  and  LN  waveguides.  Intra-pulse  difference  frequency  generation  is  employed  to  extend  the  spectrum  into  the  MIR  or  molecular  fingerprint  region,  with  ongoing  efforts  to  fully  miniaturize  the  spectrometer  system  on  a  TFLN  chip  for  high-speed  spectroscopy  applications.  Finally,  this  work  introduces  frequency  and  intensity  tunability  to  static  comb  sources,  transforming  them  into  dynamic  metrological  tools.  This  capability  along  with  the  near  ultraviolet-visible  spectral  coverage  enables  precise  characterization  and  wavelength  calibration  of  large-format  detector  arrays-an  essential  step  toward  achieving  centimeter-per-second  radial  velocity  precision  required  to  detect  Earth-Sun  analogs.
■590    ▼aSchool  code:  0051.
■650  4▼aPhysics
■650  4▼aOptics
■650  4▼aAnalytical  chemistry
■650  4▼aNanoscience
■653    ▼aDispersion  engineering
■653    ▼aIntegrated  nanophotonic  waveguides
■653    ▼aLaser  frequency  combs
■653    ▼aNonlinear  optics
■653    ▼aPrecision  astronomical  spectroscopy
■690    ▼a0605
■690    ▼a0752
■690    ▼a0565
■690    ▼a0486
■71020▼aUniversity  of  Colorado  at  Boulder▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0051
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359001▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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