基于管状预电离的光栅选线TEA CO_2激光器

Grating Line Selectable TEA CO_2 Laser with Tubulous Preionizer

研制了一种基于管状预电离的可调谐横向激励大气压(TEA)CO2激光器。激光器采用光桥结构和折叠腔技术,输出稳定、结构紧凑。采用光栅谐振腔,实现了激光的调谐输出。激光器可输出谱线73条,波长范围为9.19～10.86μm,其中45条谱线输出能量大于2 J。对于P10(20),R10(20),P9(20),R9(20)四条谱线,获得最大的激光脉冲能量分别为5.3,5.4,5.5,5.1 J,对应的电-光转换效率分别为9.6%,9.8%,10.0%,9.3%;获得的最高电-光转换效率依次为10.3%,10.7%,10.7%,10.7%。在气压为30 kPa下,激光器获得的最大比注入能量为2.626 J/(L.kPa),P9(20)谱线获得的最大比输出能量为0.205 J/(L.kPa)。测量了不同气压下的四条谱线的激光脉冲波形,输出的激光脉冲宽度值有所不同,其中R9(20)的脉冲宽度最大。测量了光束远场发散角,其值为2.6 mrad。实现了激光器的高重复频率可调谐输出,重复频率最高可达190 Hz。

A tunable TEA CO2 laser with tubulous preionizer is developed.With optical bridge and folded cavity,laser is compact and stable.Tunable laser output is realized by grating resonator.73 lines of the CO2 molecule rotational transition which wavelengths range from 9.19 to 10.86 μm are obtained,and there are 45 lines whose pulse energies of laser radiation exceed 2 J.The maximum pulse energies of P10（20）,R10（20）,P9（20）,R9（20） are 5.3,5.4,5.5 and 5.1 J with the corresponding electro-optical efficiency of 9.6%,9.8%,10.0%,9.3%;The maximal electro-optical efficiency of the above four lines are 10.3%,10.7%,10.7% and 10.7% respectively.Under the gas pressure of 30 kPa,the maximal specific injection energy is 2.626 J/（L·kPa）,and the maximal specific output energy of P9（20） is 0.205 J/（L·kPa）.Laser pulse waveforms of the above four lines with different gas pressures are measured;The output pulse widths vary from each other,and the width of R9（20） is the largest.The far-field divergence angle is 2.6 mrad.Tunable high repetition laser output is realized at the repetition rate of 190 Hz.