DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Byoung-Yoon | - |
dc.contributor.advisor | 김병윤 | - |
dc.contributor.author | Yun, Seok-Hyun | - |
dc.contributor.author | 윤석현 | - |
dc.date.accessioned | 2011-12-14T07:27:32Z | - |
dc.date.available | 2011-12-14T07:27:32Z | - |
dc.date.issued | 1997 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=128500&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/47575 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 물리학과, 1997.8, [ v, 117 p. ] | - |
dc.description.abstract | This dissertation describes principles, fabrications, evaluations, and applications of all-fiber Acousto-Optic(AO) devices based on optical mode coupling by a flexural acoustic wave. Three different types of AO devices are described, which use a two-mode fiber(TMF), a fused tapered null coupler, and a single-mode fiber, respectively. Main emphasis is on their spectral characteristics and polarization properties and applications to fiber lasers. Spectral bandwidths of a few nm and tuning ranges of a few tens nm are typically achieved. Polarization dependence of the TMF device using a slightly elliptical-core fiber is greatly reduced by canceling out the geometrical and the stress-induced birefringences by thermal treatment of the fiber. A double-pass configuration using the null-coupler AO device is employed to realize polarization-independent filtering without optical frequency shift. Using multiple cladding modes, a multi-frequency operation of the notch filter based on the single-mode fiber is introduced for electronically controllable designer spectral profiles. Acousto-optic interaction in the TMF AO device is analyzed by using a coupled mode analysis and the acoustic waveguide equation. A new coaxial acoustic transducer is developed to improve the electrical-to-acoustic conversion efficiency and device``s ruggedness required to make it practical. Wavelength tunable modeless $Nd^{3+}$- and $Er^{3+}$-doped fiber lasers are de-monstrated by incorporating the AO devices in the cavity. Key factors governing the operation of wavelength-swept fiber lasers using swept AO filters are investigated both theoretically and experimentally, which shows that matching the filter sweep rate to the frequency shift per roundtrip gives a reduction in the instantaneous linewidth. It is also shown that a large amplified spontaneous emission noise suppresses the natural tendency of the frequency-shifted fiber lasers to pulsing associated with the nonlinear Kerr effect. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Frequency Shifter | - |
dc.subject | Tunable Laser | - |
dc.subject | Filter | - |
dc.subject | Fiber Laser | - |
dc.subject | Acousto-optic device | - |
dc.subject | Optical fiber | - |
dc.subject | 광섬유 | - |
dc.subject | 주파수 변환기 | - |
dc.subject | 파장가변 레이저 | - |
dc.subject | 파장필터 | - |
dc.subject | 광섬유 레이저 | - |
dc.subject | 음향광학 소자 | - |
dc.title | All-fiber acousto-optic devices and their applications to fiber lasers | - |
dc.title.alternative | 광섬유 음향광학 소자와 이를 이용한 광섬유 레이저 연구 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 128500/325007 | - |
dc.description.department | 한국과학기술원 : 물리학과, | - |
dc.identifier.uid | 000935233 | - |
dc.contributor.localauthor | Yun, Seok-Hyun | - |
dc.contributor.localauthor | 윤석현 | - |
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