不同宽带脉冲在钕玻璃放大器中的幅频效应  

Frequency modulation to amplitude modulation conversion of different broadband pulses propagating in Nd-glass amplifiers

作　　者：钟哲强[1] 张彬[1] 

机构地区：[1]四川大学电子信息学院,成都610064

出　　处：《强激光与粒子束》2012年第12期2811-2816,共6页High Power Laser and Particle Beams

摘　　要：宽带脉冲在钕玻璃放大器中传输时,由于受到增益窄化和增益饱和效应的影响,脉冲频谱将受到调制,从而产生边带丢失或者频谱两侧失衡,进而导致脉冲时间波形产生调制。针对不同的宽带光源模型,数值模拟了放大器输出波形的幅度调制,分析了增益带宽、输入脉冲带宽及增益曲线中心波长相对输入脉冲中心波长的偏差等因素对输出脉冲调制度的影响。结果表明:不同的宽带光源脉冲经过钕玻璃放大器后,均会产生不同程度的幅度调制;啁啾堆积脉冲比正弦相位调制脉冲产生的幅度调制小。During propagating in Nd-glass amplifiers,the spectra of the broadband laser pulses are modulated due to gain narrowing and gain saturation effects,resulting in loss of sidebands and unbalance of the spectra,and further leading to the temporal intensity modulation.The amplitude modulations（AMs） have been numerically simulated for different broadband laser sources.The effects of the gain bandwidth,the laser bandwidth,as well as the deviation of central wavelength between the laser source and amplifier on the AMs have been analyzed.Results indicate that all of the different broadband laser sources discussed in this paper exhibit more or less AMs,and the temporal intensity modulation of stacked chirped pulses is smaller than that of sinusoidally frequency-modulated pulses.

关 键 词：宽带光源 幅频效应 钕玻璃放大器 幅度调制 

分 类 号：TN241[电子电信—物理电子学]