SiO(b3П)与Na的近共振传能过程是钠原子化学激光的关键步骤。为了对这一过程进行初步的实验研究,建立了一个包括SiO(b3П)合成系统和Na蒸气生成供给系统在内的近共振传能实验装置。通过SiH4热解产物与N2O反应合成了一定浓度的亚稳态储能粒子——SiO(b3П); 在此基础上进行了SiO(b3П)与Na混合传能的实验研究。测到了SiO(b3П)和Na(4d2D)的自发辐射光谱,并且验证了SiO(b3П)与Na近共振传能及Na(4d2D)粒子的存在。进一步研究发现,在SiH4流量为0.09 mmol/s,SiH4载气流量为14.88 mmol/s,N2O流量为0.744 mmol/s,SiH4热解炉温度为1350 K实验条件下,当Na蒸气载气流量(7.44 mmol/s)保持不变时,Na(4d2D)粒子数密度与Na池温度成递增关系; 而当Na池温度(分别在673 K和723 K)固定时,Na(4d2D)粒子数密度与Na蒸气载气流量基本成线性递增关系。

The near resonant energy transfer from SiO(b3П) to Na is one of the most important processes of the chemical sodium atom laser. In order to research the process, an experimental device of near resonant energy transfer, which includes a system of synthesizing SiO(b3П) and a system of producing and carrying sodium vapor, was set up. The metastable state energy storage particle—SiO(b3П) was synthesized by the reaction of products of silane pyrolysis and N2O. Based on these works, the experimental research of energy transfer from SiO(b3П) to Na has been done. The spontaneous emission spectra of SiO(b3П) and Na(4d2D) was detected; the existence of the near resonant energy transfer from SiO(b3П) to Na and the existence of Na(4d2D) were testified. The further research showed that under the experimental conditions of the flow rate of SiH4 at 0.09 mmol/s, the flow rate of SiH4 buffer gas at 14.88 mmol/s, the flow rate of N2O at 0.744 mmol/s, and the pyrolysis temperature of SiH4 at 1350 K, when the flow rate of Na buffer gas (7.44 mmol/s) is fixed, the density of Na(4d2D) increases with the rise of the temperature of Na oven; and when the temperatures of Na oven (673 K and 723 K respectively) are fixed, the density of Na(4d2D) increases with the rise of the flow rate of Na buffer gas almost linearly. This work provides a preparation for the further research of this laser system, such as the measurement of signal gain and performance of lasing.