TEA CO2激光器同轴非稳腔光束质量

Beam quality of TEA CO2 lasers with coaxial output unstable resonators

摘要: TEA CO2激光器作为推进系统的理想新能源之一,在提高单脉冲能量的同时,为了保证远距离传输效率,必须对其光束质量提出适当要求。通过漫反射法及分光束法精确测量了1Hz下TEA CO2激光器在平-凹型稳定腔和改进的带有涡流管冷却系统的同轴非稳腔的光束发散角,在得到稳腔β=12.53的情况下,采用改进后的同轴非稳腔,β=3.28,且单脉冲能量损失很少。这一结果对继续研制激光推进系统中大体积高能TEA CO2激光器是很有帮助的。

Abstract: As one of the ideal and new energy sources in propulsion systems,TEA CO2 laser,with the increasing of single pulse energy,must have high beam quality to acquire high efficiency in long distance transmission.The divergence angle of TEA CO2 laser with stable resonator and improved unstable resonator with a vortex tube cooling system are accurately measured at 1Hz,using diffuse reflection and beam filter method respectively,giving the value of β is 12.53 and 3.28 respectively.Meanwhile,the pulse energy of unstable resonator reduced very little.As the result shown,the improved unstable resonator is much more valuable in propulsion system and the result is helpful in large volume high energy TEA CO2 lasers.