基于频移反馈腔的全光纤射频调制脉冲激光研究
发布时间：2018-09-14 08:53
【摘要】：射频调制的脉冲激光是激光雷达探测领域内的一项重要研究内容.根据声光斩波器的强度和频率调制特性,设计了基于频移反馈腔的全光纤射频调制脉冲激光.理论上,建立了基于频移反馈腔的激光外差相干理论模型,并进行了数值仿真.根据理论模型,实验上严格控制频移反馈腔的长度和声光斩波器触发信号的周期,在100 MHz的射频信号驱动下,产生了脉冲宽度110 ns、重复频率约20 kHz的具有最高700 MHz射频调制的脉冲激光(脉内调制激光);同时微调斩波周期可以实现脉冲前沿或后沿的多样性射频调制.通过改变反馈腔内光纤放大器的输出功率实现了射频调制深度的连续可调,最高达到了0.67.
[Abstract]:RF modulated pulsed laser is an important research content in the field of lidar detection. According to the intensity and frequency modulation characteristics of acoustooptic chopper, an all-fiber RF modulated pulse laser based on frequency shift feedback cavity is designed. Theoretically, the theoretical model of laser heterodyne coherence based on frequency shift feedback cavity is established, and the numerical simulation is carried out. According to the theoretical model, the length of frequency shift feedback cavity and the period of acousto-optic chopper trigger signal are strictly controlled experimentally. The frequency shift feedback cavity is driven by 100 MHz RF signal. A pulse laser with a pulse width of 110 ns, and a repetition rate of about 20 kHz with a maximum RF modulation of 700 MHz (intrapulse modulated laser) is generated. The RF modulation depth is continuously adjustable by changing the output power of the fiber amplifier in the feedback cavity, and the maximum is 0.67.
【作者单位】： 北京理工大学光电学院;
【基金】：国家自然科学基金(批准号:61308054)资助的课题~~
【分类号】：TN24
[Abstract]:RF modulated pulsed laser is an important research content in the field of lidar detection. According to the intensity and frequency modulation characteristics of acoustooptic chopper, an all-fiber RF modulated pulse laser based on frequency shift feedback cavity is designed. Theoretically, the theoretical model of laser heterodyne coherence based on frequency shift feedback cavity is established, and the numerical simulation is carried out. According to the theoretical model, the length of frequency shift feedback cavity and the period of acousto-optic chopper trigger signal are strictly controlled experimentally. The frequency shift feedback cavity is driven by 100 MHz RF signal. A pulse laser with a pulse width of 110 ns, and a repetition rate of about 20 kHz with a maximum RF modulation of 700 MHz (intrapulse modulated laser) is generated. The RF modulation depth is continuously adjustable by changing the output power of the fiber amplifier in the feedback cavity, and the maximum is 0.67.
【作者单位】： 北京理工大学光电学院;
【基金】：国家自然科学基金(批准号:61308054)资助的课题~~
【分类号】：TN24
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