高功率波長穩定的半導體雷射(𝝀=976 nm)應用甚廣，如用以泵浦摻鐿光纖雷射。本論文中，我們量測了以VBG穩定波長的半導體雷射的特性: 其輸出功率可超過10W，其雷射閾值為0.49 A，中心波長為976.2 nm。在固定溫度的情況下，每改變泵浦電流一安培，其輸出波長偏移 0.07 nm，而在幫浦電流固定的情況下，每改變溫度1°C，其輸出波長僅紅移 0.014 nm。我們也架設了一座麥克森干涉儀，量得其線寬約為0.108 nm，與光譜分析儀量測結果相符。此方法亦可以決定雷射輸出是否為多縱向模。利用此雷射二極體，我們成功的泵浦雙包層摻鐿光纖雷射系統，利用非線性極化旋轉機制及色散控制產生重複率為14.9 MHz 的鎖模雷射脈衝；並與同一系統利用915 nm 波長雷射泵浦時之行為相比較。本論文中也展示用915 nm 及976 nm 同時泵浦此雷射系統之可能性及脈衝壓縮的結果。最後我們提出系統改進之可能性。

There are many applications of wavelength-stable high-power laser diodes. For example, such lasers have been used to pump ytterbium-doped fiber laser systems. In this thesis, we have characterized highly-stable diode laser of which the wavelength were locked by a volume Bragg grating (VBG). This laser diode can generate power exceeding 10 Watts. The lasing threshold is 0.49 A and the center wavelength is 976.2 nm at room temperature. In the case of a fixed temperature, the output wavelength shifts with bias current by 0.07 nm/A. Keeping the bias current a constant, the output wavelength shifts by 0.014 nm for temperature change of 1°C. Furthermore, we set up a Michelson interferometer and determine that the laser linewidth is about 0.108 nm, which is consistent with the results obtained by using an optical spectrum analyzer. This method can also be used to determine whether the laser output consists of multiple longitudinal modes. We have also successfully pumped a double-clad dispersion-mapped Yb-doped fiber laser system with this laser diode to generate mode-locked pulses. Results are compared with performances of the same laser pumped by laser diodes operating at 915 nm. We also study the feasibility of simultaneous pumping with 915 nm and 976 nm and pulse compression. Finally, we propose schemes for further improvements of the laser system.

中文摘要 I
Abstract II
致謝 III
Table of Contents IV
List of Figures VI
List of Abbreviations X
Chapter 1 Introduction 1
Chapter 2 Theoretical backgrounds 4
2.1 Wavelength stabilized high power laser diode 4
2.2 Volume Bragg grating (VBG) 6
2.2.1 Photo-thermo-refractive (PTR) glass 7
2.2.2 Plane wave theory 8
2.3 Coherence measurement 11
2.4 Ultrafast Mode-Locked Laser 13
2.4.1 Mode-locking theory 13
2.4.2 Active mode-locking 15
2.4.3 Passive mode-locking 16
2.4.4 Mode-locking by nonlinear polarization evolution (NPE) 17
2.5 Optical fiber 19
2.5.1 Ytterbium (Yb) doped active fiber 19
2.5.2 Pumping wavelength of laser diode 21
2.6 Dispersion management 21
2.6.1 Pulse propagation in a dispersive medium 21
2.6.2 Grating pair compressor 23
Chapter 3 Characteristics of 976 nm VBG LD 28
Chapter 4 Experiment results 34
4.1 Experiment setup 34
4.2 915 nm LD pump laser system 37
4.3 976 nm VBG-locked LD pump laser system 43
4.4 976 nm and 915 nm dual-wavelength pump laser system 48
4.5 Different pumping source comparison 53
Chapter 5 Conclusion and future work 58
References 60

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