连续波氟化氢激光输出光谱特性研究

Output Spectrum of Continuous Wave Hydrogen Fluoride Laser

设计了V型折叠非稳定光学谐振腔,对不同氧化剂过量系数条件下连续波氟化氢(HF)激光输出谱线变化规律进行分析。结果表明,在合适的激光反应体系配方和光学谐振腔参数下,波长大于2.87μm的2P8和2P9等HF激光长波谱线能够有效输出。调节燃烧室反应相对氧化剂过量系数,控制参与光腔激射反应的自由氟原子量,能够在一定程度上调节HF激光输出谱线分布。激光器输出功率与增益系数密切相关,单支谱线的最高输出功率与其最大增益系数相对应,激光器最高输出功率与各支谱线增益系数之和的最大值相对应。

A V-model unstable optical resonator is designed, and the rule of the output spectrum of continuous wave hydrogen fluoride （HF） laser is discussed on the condition of different oxidant excess indexes. Spectral lines corresponding to wavelength over 2.87 μm, such as 2P8 and 2P9, are obtained efficiently under appropriate reaction formula and optical resonator parameters. We can partly regulate the distribution of HF laser output spectrum by adjusting the combustor oxidant excess index and controlling the amount of free fluoride atom lasing reaction. The output power of laser is closely related to the gain coefficient. The maximal output power of a single spectral line is determined by its maximal gain coefficient, while the maximal output power of the laser depends on the maximal value of the sum of all spectral lines gain coefficients.