Research on Intracavity Laser Cooling of Solid

A theoretical study of intra-cavity laser cooling by anti-Stokes luminescence in a rare-earth doped glass is performed. Compared with cooling in an external cavity by multipassing the radiation, intra-cavity cooling has the advantage of high pumping power and high-absorbed power. However, one must ensure that the cavity can still form a laser by locating the material in the cavity. A model is developed to evaluate the enhancement factor and the absorbed power. The results show that for a low optical density, especially when the sample length is less than 2ram, the intracavity configuration is a very efficient method for laser cooling. The diode laser, which may become the best candidate for our model, is briefly discussed.     

带增倍镜的红外变焦光学系统设计

设计了一种红外三档变焦光学系统。系统工作波段为中波3.7~4.8μm,焦距为40/60/240mm,6×变倍比,具有100%冷光阑效率,加入2倍镜后,焦距为80/120/480mm。对系统进行了光学设计、传递函数分析、机械设计等分析,带增倍镜的红外三档变焦光学系统具有像质好、变焦速度快、结构紧凑的特点,可在红外成像系统中得到广泛应用。