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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 transversely excited atmospheric pressure (TEA) CO2 laser based on tubular pre-ionization was developed. Laser beam bridge structure and folding chamber technology, the output stability, compact structure. Using grating resonator, the laser output tuning. The laser can output 73 lines with the wavelength range of 9.19 ~ 10.86μm, of which 45 lines output energy greater than 2J. For the four lines of P10 (20), R10 (20), P9 (20) and R9 (20), the maximum laser pulse energies were 5.3, 5.4, 5.5 and 5.1 J, respectively. The corresponding electro-optical conversion efficiencies were 9.6%, 9.8%, 10.0% and 9.3%, respectively. The highest electro-optical conversion efficiencies were 10.3%, 10.7%, 10.7% and 10.7%, respectively. The maximum specific energy of 2.626 J / (L.kPa) obtained by the laser at 30 kPa pressure was 0.205 J / (L.kPa). The laser pulse waveforms of four lines under different pressures were measured. The output laser pulse width values were different, and the pulse width of R9 (20) was the largest. The beam divergence angle was measured at 2.6 mrad. Achieves a high repetition rate laser output can be tuned, the repetition rate up to 190 Hz.