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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
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104820
- ISBN
- 9798291578339
- DDC
- 530
- 저자명
- Sekhar, Pooja.
- 서명/저자
- 10 Gigahertz Electro-Optic Combs Spanning Ultraviolet-Visible to Mid-Infrared
- 발행사항
- [Sl] : University of Colorado at Boulder, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 194 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
- 주기사항
- Advisor: Diddams, Scott A.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2025.
- 초록/해제
- 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.
- 일반주제명
- Physics
- 일반주제명
- Optics
- 일반주제명
- Analytical chemistry
- 일반주제명
- Nanoscience
- 키워드
- Nonlinear optics
- 기타저자
- University of Colorado at Boulder Physics
- 기본자료저록
- Dissertations Abstracts International. 87-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017359001
■00520260202104820
■006m o d
■007cr#unu||||||||
■020 ▼a9798291578339
■035 ▼a(MiAaPQ)AAI32169144
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■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.
