高重复频率可调谐TEA CO_2激光研究

Investigation on Tunable High Repetition Rate TEA CO_2 Laser

以研制平均功率千瓦级的实用化高重复频率可调谐TEACO2激光器为目标,分别研究了注入锁定、低锐度法布里珀罗(FP)耦合腔、光栅选线等三种调谐方法。利用光栅选线的方案,采用光栅谐振腔,实现了平均功率千瓦级的高重复频率TEACO2激光调谐输出。激光器输出10P(20),10R(20),9P(20),9R(20)线的脉冲能量分别为5.8J,5.8J,5.5J,5.6J,重复频率200Hz,光束远场发散角为1.66mrad(水平)与1.43mrad(竖直),约为2倍衍射极限。

Tunable high repetition rate transversely excited atmospheric-pressure (TEA) CO2 laser has potential applications in laser chemistry, laser radar and optically pumped far-infrared laser investigation. In this paper, with the aim of development of kilowatt-level high repetition rate tunable TEA CO2 laser, inject-locking method, low fitness Fabry-Perot (F-P) coupler method and grating line selection method were investigated. With the method of grating line selection, kilowatt-level high repetition rate tunable TEA CO2 laser output was realized by grating resonator. The pulse energies of 10P(20), 10R(20), 9P(20) and 9R(20) are 5.8 J, 5.8 J, 5.5 J and 5.6 J respectively, at the repetition rate of 200 Hz. The far-field divergence angles are 1.66 mrad (horizontal) and 1.43 mrad (vertical), namely, about 2 times of diffraction limitation.