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采用未泵浦掺铒光纤作为饱和吸收体压缩线宽,窄带高反光纤光栅作为波长选择器件,通过偏振控制器和偏振相关隔离器控制环形腔中行波的偏振态,利用反馈电路控制980 nm泵浦源的输入电流,以减小铒离子的弛豫振荡对光强波动带来的影响。研制的光纤激光器线宽小于8 kHz,相对强度噪声(RIN)10 kHz内小于-100dB/Hz,1 kHz处1 m程差干涉仪的相位噪声小于-120 dB/(Hz)~(1/2),长时间监测无跳模现象,输出激光功率稳定。
Using uncoiled erbium-doped fiber as saturation absorber compression linewidth and narrow-band high-anti-fiber grating as wavelength selection device, the polarization state of traveling wave in annular cavity is controlled by polarization controller and polarization-dependent isolator. The feedback circuit is used to control 980 nm pump Pu source input current, in order to reduce erbium ion relaxation oscillations on the impact of light intensity fluctuations. The designed linewidth of fiber laser is less than 8 kHz and the relative intensity noise (RIN) is less than -100 dB / Hz in 10 kHz. The phase noise of 1 μm path difference interferometer at 1 kHz is less than -120 dB / (Hz) ), Long time no mode-monitoring phenomenon, the output laser power and stability.