氮稀释剂连续波DF激光器输出光谱分析

Analysis of Output Spectrum in Nitrogen Diluted Continuous Wave DF Laser

为获得氮稀释剂燃烧驱动连续波DF激光器输出光谱特性,利用傅里叶红外光谱仪对Z型折叠非稳定光学谐振腔DF激光器的外传输光路高反射镜散射激光进行了光谱分析.结果表明:采用N2稀释剂的DF激光输出谱线向长波偏移,有效输出波长大于4.0μm的3P10～3P13谱线,且各振动能级跃迁谱线为更高转动量子数跃迁谱线.各支谱线存在谱带间和谱带内竞争,且在一定程度上体现级联效应.改变燃烧室反应氧化剂过量系数,能够在一定程度上调节DF激光输出谱线分布.过量的副燃料主要为满足气动性能需求,在合适范围内变化的副燃料比对输出谱线及分布影响较小.研究结果可为燃烧驱动连续波DF激光技术研究及应用提供参考.

In order to acquire characteristic of the output spectrum in nitrogen diluted combustor driven continuous wave deuterium fluoride laser,the spectrum analysis was accomplished basd on Z-model unstable optical resonator,which used Fourier infrared spectrum analyzer measuing scatter of the reflector mirror in out optical path.The results show that the output lines of nitrogen diluted DF laser transfer to long wavelength,and 3P10~3P13 lines with wavelength larger than 4.0μm are brought out efficiently.Also,the transition lines of each vibrational energy level take on higher rotational quantum number.The output spectra of DF laser compete intensely existing in self and different band,and cascade effect appears among them.The distribution of DF laser output spectra can be regulated partly by adjusting the combustor oxidant excess index.It satisfies pneumatic performance with excess second fuel,and the distribution or output spectra is affected faintly with the appropriate second fuel ratio range.The results have a reference to research and application of the combustion driven continuous wave DF laser.