射频激励轴快流CO2激光放大器增益性能的研究
Gain Performance of Radio Frequency-Excited Axial Fast-Flow CO2 Laser Amplifier
黄维 1游聪 1林高洁 1李波 1赵江 2胡友友3
作者信息
- 1. 华中科技大学光学与电子信息学院,湖北 武汉 430074
- 2. 湖北大学微电子学院,湖北 武汉 430062
- 3. 江苏科技大学理学院,江苏 镇江 212100
- 折叠
摘要
为实现高功率、短脉冲CO2激光输出,自行研制了一台13.56 MHz射频(RF)激励的轴快流CO2激光放大器,可调节射频注入功率范围为0～88 kW,并搭建激光放大实验装置研究放大器的增益性能.首先,描述了六温度模型理论,建立激光放大动力学方程,并对其输出特性进行了计算;其次,研究了3种不同腔压下放大器射频注入功率、CO2占比及非解离比等参数与小信号增益系数的关系,当腔压为8 kPa、射频注入功率为50 kW、CO2占比为14%时,放大器获得最大的小信号增益系数,且随着射频注入功率的不断增大,小信号增益系数呈现先增大然后逐渐饱和的趋势;然后,理论分析了放大器出现增益饱和现象的原因,通过实验测得当种子光输入功率为110 W时,放大器输出功率可达3500 W以上;最后,模拟了增益提取阶段激光脉冲波形的演化并分析了小信号增益系数随时间变化特性.
Abstract
To achieve high power,short-pulse CO2 laser outputs,a 13.56 MHz radio frequency(RF)-excited axial fast-flow CO2 laser amplifier with an adjustable RF injection power of 0‒88 kW is developed in this study.Additionally,a laser-amplification experimental device is created to investigate the gain performance of the amplifier.First,the six-temperature model theory is described and the laser-amplification kinetic equation is established and its output characteristics are calculated.Second,the relationship between amplifier RF injection power,CO2 proportion,non-dissociation ratio,and other parameters and the small-signal gain coefficient under three different cavity pressures is analyzed.When the amplifier cavity pressure is 8 kPa,the RF injection power is 50 kW,and the CO2 ratio is 14%,the maximum small-signal gain coefficient is obtained.As the RF injection power continues to increase,the small-signal gain coefficient first increases and then gradually saturates.Reasons contributing to the amplifier-gain saturation are analyzed theoretically.Based on experimental measurements,when the seed light input power is 110 W,the amplifier output power can exceed 3500 W.Finally,the evolution of the laser-pulse waveform during the gain-extraction stage is simulated and the time-domain variation characteristics of the small-signal gain coefficient are analyzed.
关键词
放大器/高功率CO2激光/六温度模型/小信号增益Key words
amplifier/high power CO2 laser/six-temperature model/small signal gain引用本文复制引用
出版年
2024
NETL
NSTL
万方数据