单频调制的相位调制激光在频率损失下激发的幅频效应

Amplitude-frequency effect excited by the phase-modulated laser with single-frequency modulation under frequency loss

鉴于当前对幅频效应的研究主要局限于从时域角度关注脉冲顶部调制,无法全面揭示其在频域或其它维度上的特性,从单频激光相位调制模型出发,结合理论仿真和实验验证,从波形强度调制度、激发的幅度调制信号强度和频谱分布变化等角度,研究了单阶次频率损失、整体频率损失以及调制深度变化对幅频效应激发的影响。研究结果表明,随着相位调制激光偏离滤波器中心位置距离增大,波形强度调制度随之增强,但激发的调制信号强度则呈现先上升后下降的趋势;与单阶次频率损失相比,整体频率损失所激发的幅频效应中,调制信号主要集中在基频和二次谐波上;此外,调制深度的增加会导致光谱宽度增大以及激发的调制信号强度增强。

Given that the current research on amplitude-frequency effects is primarily limited to focusing on pulse top modulation from a time-domain perspective,which fails to comprehensively reveal its characteristics in the frequency domain or other dimen-sions,this study commences from a single-frequency laser phase modulation model,combining theoretical simulations and exper-imental verifications.It investigates the impact of single-order frequency loss,overall frequency loss,and modulation depth changes on the excitation of amplitude-frequency effects,considering factors such as waveform intensity modulation,excited am-plitude modulation signal strength,and spectrum distribution changes.The research results indicate that as the phase-modulated laser deviates further from the center position of the filter,the waveform intensity modulation increases accordingly,while the ex-cited modulation signal strength exhibits a trend of first rising and then falling.Compared with single-order frequency loss,the amplitude-frequency effects excited by overall frequency loss mainly concentrate on the fundamental frequency and second har-monic.Additionally,an increase in modulation depth leads to an enhancement in spectral width and an intensification of the ex-cited modulation signal strength.