Optical properties of Cr2+: ZnSe single crystal grown under high temperature and high pressure
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摘要: 为了得到高质量、大尺寸Cr2+: ZnSe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Ф 30×120 mm Cr2+: ZnSe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+: ZnSe晶体中Cr2+的能级结构及跃迁机理。结果表明:所生长的Cr2+: ZnSe单晶结构均匀,性质稳定,1.97 μm激发的荧光光谱覆盖1.9~3 μm范围,可用于获得2~3 μm全固态中红外激光。
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关键词:
- Cr2+: ZnSe单晶 /
- 布里奇曼方法 /
- 红外吸收 /
- 红外荧光 /
- 全固态中红外激光器
Abstract: 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+: ZnSe 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+: ZnSe crystal are also studied. Experiment results show that the as-grown Cr2+: ZnSe 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. -
图 3 Cr2+∶ZnSe晶体X射线衍射图谱及ZnSe的标准pdf卡
Figure 3. XRD pattern of Cr2+∶ZnSe (above) and standard card of ZnSe
图 5 Cr2+∶ZnSe晶体红外稳态吸收光谱及红外稳态荧光光谱
Figure 5. Absorption spectrum and fluorescence spectrum of Cr2+∶ZnSe crystal
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