放电引发非链式脉冲HF激光器输出光谱特性研究

Output Spectral Characteristics of Discharge Initiated Non-Chain Pulsed HF Laser

利用项目组研制的放电引发脉冲HF激光器,测量并研究了激光输出光谱的特性。结果表明:放电引发脉冲HF激光光谱的能量主要集中于v(3—2),v(2—1)以及v(1—0)三个振动跃迁辐射带,在2.65～3.05μm波长范围内测量得到了13～16条主要的输出谱线,其中v(2—1)振动跃迁输出能量占比最大,在40%～50%之间。适当改变充电电压和工作气体总压力可以调节各个振动带输出能量的比例:v3振动能级输出能量的比例随着激光器充电电压的增加而增大,随着工作气体总压力的升高而减小,这与v1振动能级的情况相反。

The laser output spectral characteristics are measured and studied with the discharge initiated pulsed HF laser developed by our project team. The results show that the spectral energy of the discharge initiated pulsed HF laser is mainly concentrated in three vibrational transition bands of v(3—2), v(2—1) and v(1—0). The 13-16 main output spectral lines are obtained by the measurements in the wavelength range of 2.65-3.05 μm, in which the v(2—1) vibrational transition band has the highest output energy ratio, about 40%-50%. The output energy ratio in each vibrational transition band can be tuned via the suitable adjustment of charging voltage and total working gas pressure. The output energy ratio in the v3 vibrational transition band increases with the increase of laser charging voltage, but decreases with the increase of total working gas pressure, which is opposite to those for the v1 vibrational transition band.