請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/4833
標題: | 基於寬頻晶體光纖元件之功能性光學同調斷層掃描術之研究 Functional Optical Coherence Tomography Based on Broadband Crystal Fiber Light Source |
作者: | Tuan-Shu Ho 何端書 |
指導教授: | 黃升龍(Sheng-Lung Huang) |
關鍵字: | 光學,光源,晶體,光纖,光學同調斷層掃描,材料檢測, optics,light source,crystal,fiber,optical coherence tomography,material characterization, |
出版年 : | 2015 |
學位: | 博士 |
摘要: | With the co-drawing laser-heated pedestal growth (CD-LHPG) method, various crystal fibers were developed. Ce:YAG, Ce:YSO, and Ti:sapphire crystal fibers grown in our laboratory generate broadband, continuous-wave, and near-Gaussin florescence spectra under laser diode pumping, and are suitable to be the light source of optical coherence tomography (OCT) system. The Ce:YSO crystal fiber light source has a broadband fluorescence emission in the blue wavelength range, and the OCT system based on the Ce:YSO light source can achieve a 0.6-μm axial resolution on single cell measurement, and 0.5-μm axial resolution on examination of panel devices.
The crystal fiber light source has high brightness, large numerical aperture and multi-transverse-mode, and the design rules for crystal-fiber-based OCT are much different from the commercial OCT systems with tunable lasers or pig-tailed superluminescent diodes (SLD) as light sources. In this dissertation, the issues related to the fabrication of spectral-domain and full-field OCT systems are also presented and discussed. The crystal-fiber-based OCT systems are not only capable for high-resolution structural imaging, but also suitable for functional analysis. The broadband property of crystal fiber light sources also provides a large available bandwidth for spectroscopic analysis. Their near-Gaussian lineshapes also help to reduce the crosstalk problem for time-frequency analysis. A series of OCT systems are were implemented for the study of various corneal properties, and the performances were tested with human eye models. The OCT tonometry system in our laboratory, can achieve high speed intraocular pressure measurement, and to provide information related to the corneal elasticity. With carrier-analysis-based algorithm, a full-field OCT keratometry and achieve two-dimensional curvature mapping within 6-mm diameter within 70 milliseconds. An OCT approach for characterization of absorptive thin-film materials was developed, which can obtain the thickness and optical properties of absorptive films with micrometer thickness. With the Ce:YAG and Ce:YSO crystal fiber light source, the systems are able to measure the refractive index and extinction coefficient spectra from 400 to 600 nm, and a 0.15% precision was achieved on the film thickness measurement on various absorptive films. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/4833 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 光電工程學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-104-1.pdf | 6.41 MB | Adobe PDF | 檢視/開啟 |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。