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基于声光调制的频移反馈激光器是目前研究的热点,它可以生成一串频率间隔相同的谐波。为了生成多频激光,采用移频反馈激光器的方法,设计了一种全光纤式移频-放大反馈环路。理论上建立了基于频移反馈腔的激光外差相关理论模型,并进行了数值仿真;同时,在环路中引入光纤放大器,研究了增益系数对各阶次谐波相应强度的影响,验证了不同增益系数对各阶次频率的选择作用。结果表明,利用频移反馈回路,实现了数倍于基频的高频调制,最高调制频率可达4GHz。这为新体制高频调制激光的研究奠定了理论及实验基
The frequency-shift feedback laser based on acousto-optic modulation is a hot research topic at present. It can generate a series of harmonics with the same frequency interval. In order to generate multi-frequency laser, an all-optical frequency shift-amplification feedback loop is designed by using the frequency-shift feedback laser. The theoretical model of laser heterodyne based on frequency shift feedback cavity is theoretically established and numerical simulation is carried out. At the same time, an optical fiber amplifier is introduced into the loop to study the effect of gain coefficient on the corresponding intensity of each order harmonic. The Choice of Different Gain Coefficients for Different Order Frequencies. The results show that the use of frequency feedback loop to achieve several times the fundamental frequency of high frequency modulation, the maximum modulation frequency up to 4GHz. This laid the theoretical and experimental basis for the research of high-frequency modulated laser in the new system