小型电激励连续波DF化学激光器的实验研究

对一台小型电激励连续波DF化学激光器进行了实验研究,在光轴位于喷管阵列出口平面下游10mm处和15mm处分别进行了出光实验,得到188.4W和205.8W的DF激光输出,输出激光波长为3.6~4.1μm,激光器的电效率分别为2.3%和2.5%。该小型电激励连续波DF化学激光器长时间(100s)运行的功率稳定性峰谷值和均方根值分别为±1.04%和0.49%,工作状态较为稳定,实验可重复性好,操作方便,是强光条件下镜片膜层吸收系数测量的适用红外激光光源。     

Absorption measurement of optical thin films under high power density with a Closed Cavity

A Closed Cavity measuring platform is built on the basis of a 1000 W-class direct current(DC)-discharge drived continuous-wave(CW) HF/DF chemical laser. On this platform, the absorption coefficients of optical thin films coated on the surfaces of monocrystalline silicon substrates, at the wavelength of 3.6–4.1 μm, is measured, when the power density on the surfaces of optical thin films reaches about 3.16 kW ∕cm2. The measuring principle and structure of the Closed Cavity is introduced. The temperature curves and balanced temperature rises of the film-substrate systems under test measured through the experiment is presented in this Letter. The experiments show high reliability, good repeatability and strong practicality. The Closed Cavity measuring platform is applicable for not only absorption measurement but other performance measurement of optical thin films under high power density.