摘要
利用描述CO_2激光器动力学过程的六温度模型理论,建立了计算调Q CO_2激光功率放大器输出特性的数学模型,进行了理论分析和数值计算,并讨论了分光比等参数对输出脉冲特性、输出光谱的影响。结果表明:该调Q CO_2激光功率放大器存在临界增益长度和临界光强分束比,低于临界值时无法获得激光输出;该调Q CO_2激光功率放大器的输出激光脉冲波形、峰值功率、脉冲宽度、输出光谱与光强分束比、抽运电子数密度等参数有关,光强分束比越小,输出的调Q激光脉冲宽度越大,峰值功率越低;该调Q CO_2激光功率放大器利用Q调制的高增益特性,通过控制调Q元件所在的低功率支路可以实现高平均功率的调Q脉冲CO_2激光输出,很好地解决了调Q CO_2激光功率放大器难以高功率运转的问题。
By using the six temperature model theory on the kinetic process in a CO2 laser system,we build a mathematical model to calculate output characteristics of Q-switched CO2 laser power amplifier.Theoretical analysis as well as numerical calculation is carried out,and the effects of parameters such as beam split ratio on output pulse characteristics and output spectra are discussed.The results show that the Q-switched CO2 laser power amplifier has a critical gain length and a critical beam split ratio,below which no laser output can be obtained.The laser pulse waveform,peak power,pulse width,and output spectra of the Q-switched CO2 laser power amplifier are all effected by the beam split ratio and pumping electron density.The less the beam split ratio,the greater the output Q-switched laser pulse width,and the lower the laser peak power.The Q-switched CO2 laser power amplifier utilizes the high gain characteristic of Q modulation.By controlling the low power branch of Q-switched elements,we realize the Q-switched pulse CO2 laser output with high average power.The problem that Q-switched CO2 laser power amplifier is difficult to operate at high power is well solved.
作者
柯常军
钟艳红
李丹阳
万磊
吴谨
Ke Changjun;Zhong Yanhong;Li Danyang;Wan Lei;Wu Jin(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2018年第4期241-247,共7页
Acta Optica Sinica
基金
国家自然科学基金(61475157)
