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フォトニックバンドギャップ導波路による利得制御を用いた単一周波数ファイバーレーザー光源の開発

机译：利用光子带隙波导的增益控制开发单频光纤激光源

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摘要

For the applications at the yellow-orange color region, such as laser guide star, laser coagulation, and spectroscopy,fiber laser sources at the wavelength range of 1150 nm-1200 nm are alternatively investigated because of no gain medium at the visible region. Ytterbium fiber laser and amplifier have shown excellent performances in high output power and efficiency at 1μm. Since the gain peak of an Yb fiber is around 1030 nm, in the case of the long wavelength operation, the Yb fiber laser/amplifier suffers from strong amplified spontaneous emission (ASE) and parasitic lasing at unwonted wavelengths near the gain peak. In this thesis the development of the high-power, single-frequency fiber sources at 1178 nm is presented. The gain peak of Yb3+ is modified by use of the photonic bandgap fiber (PBGF). At the high gain region, large propagation loss was applied by the spectral filtering property of the PBGF core. The single-frequency source is based on the master-oscillator power amplifier configuration and composed of one oscillator and two amplifiers. The seed was in-house external cavity laser diode. Fiber Raman amplifier (FRA) was developed as the preamplifier in order to obtain highly efficient amplification at the PBGF amplifier. Because the power limitation by the nonlinear effect, stimulated Brillouin scattering (SBS), is the main obstacle in the case of the narrow linewidth, mitigation techniques of SBS are investigated for the power scaling. Three different SBS mitigation techniques were experimentally tested in the FRA. Eventually the SBS mitigation at both FRA and PBGF amplifier were achieved by the spectral linewidth broadening using electro-optical phase modulator. Besides the experiments, several numerical studies were introduced to predict the suitable PBGF and amplifier designs. The higher ASE suppression was founded in the case of that the fiber bending radius is orthogonal to the PBGFu27s boron axis. For the further power scaling large mode area PBGFs have been developed and experimentally tested in the amplifier.
机译：对于在橙黄色区域的应用，例如激光导星，激光凝结和光谱学，由于在可见区域没有增益介质，因此可以选择研究波长范围为1150 nm至1200 nm的光纤激光源。 tter光纤激光器和放大器在1μm的高输出功率和效率下表现出出色的性能。由于Yb光纤的增益峰值在1030 nm左右，因此在长波长操作的情况下，Yb光纤激光器/放大器会遭受强烈的放大自发发射（ASE）和在增益峰值附近的非获知波长处产生寄生激光。本文提出了大功率单频光纤在1178 nm的发展。 Yb3 +的增益峰通过使用光子带隙光纤（PBGF）进行修改。在高增益区域，由于PBGF核的光谱过滤特性，导致了较大的传播损耗。单频源基于主振荡器功率放大器配置，并且由一个振荡器和两个放大器组成。种子是内部外腔激光二极管。开发了光纤拉曼放大器（FRA）作为前置放大器，以便在PBGF放大器上获得高效的放大。由于在窄线宽的情况下受非线性布里渊散射（SBS）限制的功率限制是主要障碍，因此研究了SBS的缓解技术以进行功率缩放。在FRA中对三种不同的SBS缓解技术进行了实验测试。最终，通过使用电光相位调制器加宽谱线宽度，实现了FRA和PBGF放大器的SBS缓解。除了实验之外，还引入了一些数值研究来预测合适的PBGF和放大器设计。在光纤弯曲半径与PBGF u27s硼轴正交的情况下，建立了更高的ASE抑制。为了进一步进行功率缩放，已经开发了大模式面积PBGF，并在放大器中进行了实验测试。

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    陳 明晨; Mingchen Chen;

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