高温高压制备Cr^(2+):ZnSe单晶及其光学性质

Optical properties of Cr^(2+):ZnSe single crystal grown under high temperature and high pressure

为了得到高质量、大尺寸Cr2+∶Zn Se中红外激光晶体,以适应高功率全固态中红外激光器的发展要求,在高温高压下全石墨腔内运用布里奇曼晶体生长方法,生长出了高质量Ф30×120 mm Cr2+∶Zn Se单晶。采用X射线粉末衍射(XRD)、透射电镜(TEM)、红外稳态吸收及荧光光谱等测试方法对晶体的结构及光谱特性进行了表征,并探讨了Cr2+∶Zn Se晶体中Cr2+的能级结构及跃迁机理。结果表明:所生长的Cr2+∶Zn Se单晶结构均匀,性质稳定,1.97μm激发的荧光光谱覆盖1.9~3μm范围,可用于获得2~3μm全固态中红外激光。

In order to obtain single crystal with brilliant quality and large size to accommodate the requirement of high-power solid state Mid-IR laser,the Cr2 ＋∶ Zn Se single crystal is grown in the all-graphite cavity with the surrounding of super-high pressure and temperature by the method of Bridgeman. By means of the X-ray Diffraction（ XRD）,Transmission Electron Microscope（ TEM）,absorption and fluorescence spectra,the structure,optical properties of the crystal are investigated. Meanwhile,energy level structure and transition mechanism of Cr2 ＋in the Cr2 ＋∶ Zn Se crystal are also studied. Experiment results show that the as-grown Cr2 ＋∶ Zn Se crystal with well-distributed structure and stable physical properties has much wider spectral range of 1. 9-3. 0 μm range under the pumping source of 1. 97 μm laser. It is applicable to obtain a mid-IR laser at the range of 2- 3 μm.