Dissertation/ Thesis
利用運行在近布拉格區之聲光偏轉器進行超短脈衝雷射的角度色散補償 ; The Angular Dispersion Compensation for Ultrashort-Pulsed Laser using an Acousto-Optic Deflectors Operated in the Near Bragg Region
| العنوان: | 利用運行在近布拉格區之聲光偏轉器進行超短脈衝雷射的角度色散補償 ; The Angular Dispersion Compensation for Ultrashort-Pulsed Laser using an Acousto-Optic Deflectors Operated in the Near Bragg Region |
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| المؤلفون: | 何禎哲 |
| سنة النشر: | 2017 |
| المجموعة: | National Taiwan University of Science and Technology Repository (NTUSTR) / 台灣科技大學 |
| مصطلحات موضوعية: | 聲光效應, 聲光偏轉器, 超短脈衝雷射, 飛秒雷射, 近布拉格區, 角度色散, 角度色散補償, Acousto-optic, Acousto-optic deflectors, Ultrashort-pulsed Laser, femtosecond Laser, Near-Bragg region, Angular dispersion, Angular dispersion compensation |
| الوصف: | 國立臺灣科技大學光電工程研究所 ; 學位：碩士 ; 指導教授：譚昌文 ; 於本論文中，利用理論模型探討當飛秒雷射(Femtosecond laser)經過運行在近布拉格區(Near-Bragg region)的聲光偏轉器(Acousto-optic deflector)產生角度色散(Angular dispersion)問題。飛秒雷射為超短脈衝(Ultrashort-pulsed)，屬於寬頻譜光源(Broadband light source)，不同頻率的光在經過聲光偏轉器時會產生不同之偏轉角度，故有角度色散之問題。透過波動方程式(Maxwell’s equations)可以推導出一組耦合方程式能具體描述飛秒雷射的光在聲光偏轉器裡的動態(dynamics)，把耦合方程式經空間傅立葉轉換(Spatial Fourier transform)再用數值模擬出脈衝經過聲光偏轉器的角度變化。 利用反向傳輸聲波的聲光偏轉器可以讓原本經過一個聲光偏轉器產生的擴散效果消失就能解決角度色散問題，數值模擬可以證明理論模型的有效性。 In this thesis, a theoretical model is proposed to discuss the angular dispersion problem of a femtosecond laser using an acousto-optic deflectors operated under the near Bragg region. The ultra-pulsed laser has broadband optical spectrum and results in a problem of angular dispersion when a pulse passed through the acousto-optic deflector. Starting from the Maxwell’s equations, a set of coupled equations can be properly derived to describe the dynamics of a femtosecond laser light inside an acousto-optic deflector. Through these coupled equations, the angular dispersion phenomenon can be properly depicted. The coupled equations can be solved numerically with the spatial Fourier transformation. The angular dispersion problem can be properly solved by using a counter propagating sound wave inside the acousto-optic deflector to offset the effect of spreading that caused by the interaction with the propagating sound wave inside the acousto-optic deflectors. Numerical simulations are provided to prove the validity of our theoretical model. |
| نوع الوثيقة: | thesis |
| وصف الملف: | 169 bytes; text/html |
| اللغة: | Chinese |
| Relation: | http://ir.lib.ntust.edu.tw/handle/987654321/69042; http://ir.lib.ntust.edu.tw/bitstream/987654321/69042/1/index.html |
| الاتاحة: | http://ir.lib.ntust.edu.tw/handle/987654321/69042 http://ir.lib.ntust.edu.tw/bitstream/987654321/69042/1/index.html |
| رقم الانضمام: | edsbas.EB8F530C |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |