由雙光子吸收訊號調制似噪音脈衝產生超連續光譜

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研究生：	余柏勳 Yu, Po-Hsun.
論文名稱：	由雙光子吸收訊號調制似噪音脈衝產生超連續光譜 Modulation of Noise-like Pulses from Two-photon Absorption Signals for Supercontinuum Generation
指導教授：	潘犀靈 Pan, Ci-Ling
口試委員:	楊承山 Yang, Chan-Shan 吳小華 Wu, Hsiao-Hua 賀清華 Her, Tsing-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：	2019
畢業學年度：	107
語文別：	英文
論文頁數：	78
中文關鍵詞：	光纖雷射、鎖模脈衝、似噪音脈衝、超連續光譜
外文關鍵詞：	fiber laser, mode locked pulses, noise-like pulses, supercontinuum
相關次數：	點閱：3 下載：0
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使用雙光子吸收訊號做為回饋信號，我們在全正色散(ANDi)及映射色散(dispersion-mapped)鐿摻雜光纖雷射系統中可自動控制產生似噪音脈衝(noise-like pulses)。若調整泵浦功率和雙光子吸收訊號，我們可以調制雷射輸出功率並控制其脈衝特性，如光強度自相干函數(Intensity autocorrelation trace)之底座(pedestal)、尖峰(spike)寬度及尖峰到肩部比例(spike to shoulder ratio)。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光譜(supercontinuum，簡稱SC)。由於超連續光譜涵蓋紅光至近紅外光波段，從683 nm 到 1743 nm，我們使用標準光源來校正不同範圍之兩台光譜儀並銜接其光譜。經過校正，我們將光強度由任意單位轉成絕對輻射照度。
使用全正色散雷射系統連接50公尺單模光纖，當雙光子吸收訊號從1233 mV上升至2130 mV，似噪音脈衝之光強度相關函數(Intensity autocorrelation function)之底座寬度從426 ps 下降到 357 ps，SC之10-dB光譜帶寬從527 nm(1002 nm~1527 nm)上升到1138 nm(998 nm~2138 nm)，光譜範圍為近紅外光波段且為平滑光譜。使用映射色散雷射系統連接五公尺光子晶體光纖，當雙光子吸收訊號從2030 mV上升到2617 mV，似噪音脈衝之光強度相關函數(Intensity autocorrelation function)之底座均為10 ps，尖峰到肩部比例從1.30上升到1.49，SC之10-dB光譜帶寬從1022 nm(685 nm~1707 nm)上升至1060 nm(683 nm~1743 nm)，光譜為一平滑光譜，光譜範圍包含可見光至近紅外光波段。

Using two photon absorption (TPA) signal as a feedback signal. We take advantage of all normal dispersion (ANDi) and dispersion mapped Yb-doped fiber laser system to generate noise-like pulses (NLPs) in automatic control. If we adjust the pump power and TPA signals, we can modulate output power, spectrum and pulses characteristics of NLPs, like pedestal, spike width, and spike to shoulder ratio. We also study NLPs to generate supercontinuum by using single mode fiber (SMF) or photonic crystal fiber (PCF). Since the spectrum of supercontinuum generation covered from red light to near infrared, from 683nm to 1743 nm, we use standard light source to calibrate two different range spectrometers and link up the spectrum. We transform the light intensity from arbitrary unit to absolute irradiance through calibration.
By using ANDi fiber laser system connected with 50m-SMF, when TPA signals increase from 1232 mV to 2130 mV ,pedestals of Intensity autocorrelation function of NLPs decrease from 426 ps to 357 ps,10-dB bandwidth of SC increases from 527 nm(1022 nm ~1527 nm) to 1138 nm(998 nm~2138 nm). Spectral range covered near infrared part and the spectrum is smooth. By using dispersion-mapped fiber laser connected with 5-meter PCF, when TPA signals increase from 2030 mV to 2617 mV ,pedestal widths of NLPs are both 10 ps, spike to shoulder ratio increase from 1.3 to 1.49 ,10-dB bandwidth of SC increase from 1022 nm(685 nm~1707 nm) to 1060 nm(683 nm~1743 nm). The spectrum is smooth, and the spectral range covered from visible light to near infrared.

中文摘要    I
Abstract    II
致謝    IV
Table of Contents    V
List of Figures    VIII
List of Tables    XI
List of Abbreviations    XII
Chapter 1    Introduction    1
Chapter 2    Theoretical background    2
1    Ytterbium-doped fiber laser and amplifier    2
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
1.5.    Amplified Spontaneous Emission (ASE)    7
2    Mode-locking techniques    8
2.1.    Mode-locking theory    9
2.2.    Active mode-locking    10
2.3.    Passive mode-locking    12
2.4.    Nonlinear polarization evolution (NPE)    13
3    Nonlinearities in optical fibers    14
3.1.    Self-Phase modulation (SPM)    14
3.2.    Stimulated Raman Scattering (SRS)    16
4    Pulse propagation in optical fiber    18
4.1.    Basic concept    18
4.2.    Nonlinear Schrödinger coupled-mode equation    21
5    Noise-like pulse (NLP)    22
5.1.    Physical mechanism    22
5.2.    Characteristics    24
6    Two photon absorption    25
6.1.    Introduction    25
6.2.    Photogenerated carrier density    25
Chapter 3    Generation of mode-locked and noise-like pulses    29
1    Dispersion-mapped fiber laser    29
1.1.    System setup    29
1.2.    Characteristics    31
1.3.    Characteristics of different TPA signals    33
1.4.    Power scaling of fiber laser    35
1.5.    First stage amplifier    37
2    All normal dispersion fiber laser    38
2.1.    Two-photon absorption of NLP    43
2.2.    Characteristics of different TPA signals    44
2.3.    First stage amplifier    47
Chapter 4    Calibration of Spectrometers    49
1    Check of spectrometers    49
2    Calibration of spectrometers    50
2.1.    Step of calibrations    52
2.2.    Results of calibration    55
3    Problems of calibrations    56
Chapter 5    Supercontinuum generated by noise-like pulse    57
1    Introduction    57
2    Simulation    57
3    Supercontinuum generation using ANDi fiber laser    62
3.1.    The effect for supercontinuum generation in different pump power (ANDi laser)    62
3.2.    The effect for supercontinuum generation in different TPA signal (ANDi fiber laser)    64
4    Supercontinuum generation using dispersion mapped fiber laser    65
5    Supercontinuum generation in photonic crystal fiber    68
5.1.    The effect for supercontinuum generation in different pump power    68
5.2.    The effect for supercontinuum generation in different TPA signal    70
6    Summary    71
Chapter 6    Conclusions and future works    72
1    Conclusions    72
References 73

                                

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