We investigated the frequency noise coupling mechanism of a 2 μm polarization-maintaining single frequency fiber laser (SFFL) theoretically and experimentally. The coupling of pump’s relative intensity noise (RIN) to frequency noise of a single-frequency high-gain silica fiber laser is shown experimentally to be consistent with a theoretical model where thermal expansion and thermo-optic effect mediate the coupling. The measured and theoretical frequency noise of the 2 μm SFFL with three pump sources is compared. We find using a 1550 nm single frequency laser pump source produces the lowest frequency noise, less than 100 $\rm {Hz/\sqrt {Hz}}$ at frequencies higher than 100 Hz.

中文翻译：

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泵浦RIN耦合到保偏2 µm单频光纤激光器的频率噪声

我们研究了高频噪声耦合的2机构μ米的偏振保持单频光纤激光器（SFFL）理论和实验。实验表明，泵的相对强度噪声（RIN）与单频高增益石英光纤激光器的频率噪声的耦合与理论模型一致，其中热膨胀和热光效应介导了耦合。的2的测量的和理论频率噪声μ具有三个泵源m SFFL相比较。我们发现使用1550 nm单频激光泵浦光源会产生最低的频率噪声，在高于100 Hz的频率下，其噪声低于100 $ rm {Hz / \ sqrt {Hz}} $。