利用似噪音脈衝產生可見光至近紅外光超連續白光光源

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研究生：	滕原合 Teng, Yuan-He
論文名稱：	利用似噪音脈衝產生可見光至近紅外光超連續白光光源 Noise-like-pulse-generated visible-NIR supercontinuum white light source
指導教授：	潘犀靈 Pan, Ci-Ling
口試委員:	施宙聰 Shy, Jow-Tsong 吳小華 Wu, Hsiao-Hua
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 光電工程研究所 Institute of Photonics Technologies
論文出版年：	2018
畢業學年度：	106
語文別：	英文
論文頁數：	77
中文關鍵詞：	似噪音脈衝、超連續光譜、自動控制
外文關鍵詞：	Noise-like pulses, Supercontinuum generation, Automatic control
相關次數：	點閱：4 下載：0
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使用雙光子致光電流吸收作為回饋訊號，改變腔內的非線性效應即化偏轉(Nonlinear polarization rotation)可以自動尋找一具長腔全正色散(ANDi)光纖雷射穩定脈衝輸出，且操縱似噪音脈衝輸出特性。此外，也可以通過調整泵浦功率和雙光子吸收致光電流之目標值來操縱超連續光譜的範圍。我們也研究以似噪音脈衝激發單模光纖及光子晶體光纖來產生超連續白光。若使用50公尺單模光纖，超連續白光光譜涵蓋1000奈米至1750奈米；使用5公尺光子晶體光纖時，超連續光譜由可見光550奈米延伸至1950奈米，且可見光波段(600奈米-1040奈米)光譜分布較為理想(近高斯型)，適合光學同調斷層掃描成像分析等應用。目前白光光譜寬度最寬可達到1400奈米。以1040奈米為界，低於此界線的白光10-dB帶寬最寬達405 nm，而在長波長範圍之10-dB帶寬為863 nm。我們也利用色散位移光纖達成時間拉伸技術後，佔空比最高可以達到85％。

Using two-photon absorption (TPA) signal as a feedback signal and rotating the nonlinear polarization rotation can automatically obtain stable pulses from long-cavity all-normal dispersion (ANDi) fiber laser. The output properties of noise-like pulses (NLPs) can be also manipulated. In addition, the range of supercontinuum spectra can be manipulated by adjusting the pump power and the target value of TPA signal. We can use NLPs source to generate the supercontinuum white light by using single mode fiber (SMF) or photonic crystal fiber (PCF). By using 50-meter SMF, the spectral range of supercontinuum white light is between 1000 nm to 1750 nm, while the spectral range by using PCF is between 550 nm to 1950 nm. The spectral pattern is ideal (similar to Gaussian shape) and is suitable for optical coherence tomography imaging analysis in visible range. At present, the white light spectrum can be up to 1400 nm. Bounded by 1040 nm, the 10-dB bandwidth is 405 nm in the short wavelength range and 863 nm in the long wavelength range. After using the dispersion-shifted fiber to achieve time-stretch technique, the highest duty cycle can be achieved to 85 %.

摘要    I
Abstract    II
致謝    III
Table of Contents    IV
List of Figures    VII
List of Tables    XII
List of Abbreviations    XIII
Chapter 1    Introduction    1
Chapter 2    Theoretical background    2
1    Fiber laser and amplifier    3
1.1.    Ytterbium-doped fiber    3
1.2.    Pumping wavelength of laser diode    5
1.3.    Doped fiber amplifier    5
1.4.    Operation of cladding pumping    6
2    Mode-locking techniques    7
2.1.    Mode-locking theory    7
2.2.    Active mode-locking    9
2.3.    Passive mode-locking    10
2.4.    Nonlinear polarization evolution (NPE)    10
3    Nonlinearities in optical fibers    12
3.1.    Four wave mixing (FWM)    12
3.2.    Self-Phase modulation (SPM)    12
3.3.    Stimulated Raman Scattering (SRS)    13
4    Ultrafast pulses propagation in fiber laser system    15
4.1.    Nonlinear Schrödinger equation (NLSE)    15
5    Automatic control of fiber laser system    17
5.1.    Introduction    17
5.2.    Choices of feedback signals    18
6    Supercontinuum generation in optical fibers    19
6.1.    Introduction    19
6.2.    Physical mechanism    19
Chapter 3    Noise-like pulses fiber laser    20
1    Background    20
2    Characteristics    21
3    Phenomenological model of noise-like pulses    23
Chapter 4    Swept-source generated from automatic ANDi fiber laser    25
1    Method of automatic control    26
2    Photogenerated carrier density    27
3    Automatic fiber laser system in short cavity    29
3.1.    Short cavity with 3nm intra-cavity bandpass filter    29
3.2.    Short cavity without intra-cavity bandpass filter    35
4    Automatic fiber laser system in long cavity    39
4.1.    Long cavity with 3nm intra-cavity bandpass filter    39
4.2.    Long cavity with 10nm intra-cavity bandpass filter    42
4.3.    Long cavity with 25nm intra-cavity bandpass filter    46
4.4.    Long cavity without intra-cavity bandpass filter    49
5    Summary    51
Chapter 5    Supercontinuum generated and pulse stretching by noise-like pulse    51
1    Introduction    51
2    Simulation    52
3    Yb-doped fiber amplifier    57
4    Supercontinuum generation in single-mode fiber    60
5    Supercontinuum generation in photonics crystal fiber    63
5.1.    System setup    63
5.2.    The effect for supercontinuum generation in different goal voltage    64
6    Summary    68
Chapter 6    Time-stretched pulses    69
1    Introduction    69
2    Experimental results    70
3    Summary    72
Chapter 7    Conclusions and future works    73
1    Conclusions    73
2    Future works    73
References    75

                                

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