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光纤放大器相位噪声的探测和校正是光纤激光器阵列相干合成的关键技术,热效应是引起光纤放大器相位噪声的主要来源。理论分析了泵浦光开启到稳态过程中光纤放大器掺杂光纤的温度变化,以及对应的光纤放大器相位变化。通过数值计算发现,泵浦光在开启后,光纤放大器的掺杂光纤温度迅速升高,相位变化剧烈,在约10 s后达到稳态,此后泵浦光的能量不稳定。这表明,泵浦光的能量不稳定是引起光纤放大器相位噪声的最主要因素,通过稳定泵浦光电流可以降低光纤放大器的相位噪声。
The detection and correction of phase noise of fiber amplifier is the key technology of coherent fiber laser array. Thermal effect is the main source of phase noise of fiber amplifier. The temperature changes of the fiber amplifier doped fiber during the pump-on to steady-state process are analyzed theoretically, and the corresponding phase changes of the fiber amplifier are analyzed. The numerical results show that the temperature of doped optical fiber in fiber amplifier increases rapidly and the phase changes rapidly after the pump light is turned on. After about 10 s, the steady state is reached, and the energy of the pump light is unstable. This shows that the energy instability of the pump light is the most important factor that causes the phase noise of the fiber amplifier. By stabilizing the pump current, the phase noise of the fiber amplifier can be reduced.