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Applied Physics 2024
基于掺铒光纤作为可饱和吸收体的窄线宽光纤激光器研究
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Abstract:
本文介绍了一种以未泵浦的掺铒光纤作为可饱和吸收体，通过3 dB耦合器及环形器，构成一个由驻波效应形成动态光栅的一种窄线宽光纤激光器。测得在中心波长在1559.54 nm处得到输出的激光器，在泵浦功率为150 mW以下时可以保持长时间的稳定工作，泵浦功率为70 mW，输出光功率为17.03 mW，斜率效率为30.73%，光学信噪比为39 dB，波长分辨率的不稳定性小于0.03 nm，光学信噪比的波动小于0.16 dB，从0到1 MHz的37.5 kHz信号频谱中的弛豫振荡频率峰值为？89.6 dB/Hz。通过延时自外差法测量线宽为1.99 kHz。
This article introduces a narrow linewidth fiber laser that uses an unpumped erbium-doped fiber as a saturable absorber and a 3 dB coupler and circulator to form a dynamic grating formed by the standing wave effect. The laser output obtained at the center wavelength of 1559.54 nm can maintain stable operation for a long time when the pump power is below 150 mW. The pump power is 70 mW, the output optical power is 17.03 mW, the slope efficiency is 30.73%, the optical signal-to-noise ratio is 39 dB, the wavelength resolution instability is less than 0.03 nm, the fluctuation of the optical signal-to-noise ratio is less than 0.16 dB, and the peak relaxation oscillation frequency in the 37.5 kHz signal spectrum from 0 to 1 MHz is ？89.6 dB/Hz. The line width was measured to be 1.99 kHz using the delayed self heterodyne method.
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