【摘要】 利用Fe²⁺:ZnSe微米粉末产生了4. 45μm的中红外随机激光。通过气相热扩散法制备了Fe²⁺离子掺杂的ZnSe多晶块体,将制得的块体研磨成尺寸在10～50μm的微米粉末。X射线衍射（XRD）结果表明这些Fe²⁺:ZnSe粉末具有与ZnSe块体相同的立方闪锌矿结构,Fe²⁺离子的引入没有改变ZnSe的晶体结构。在2. 94μm的脉冲激光泵浦下,研究了室温下Fe²⁺:ZnSe粉末的光致发光特性和发光脉冲的时间特性。随着泵浦能量增加,光谱发光强度发生跃变,光谱线宽从500 nm减小到50 nm,脉冲时间从270 ns减小到50 ns。当泵浦能量高于2 m J/pulse的阈值时,观察到中心波长4. 45μm的中红外随机激光。这种中红外随机激光器在红外标记、光通信、分子光谱测量等领域有很好的应用前景。更多还原

【Abstract】 Mid-infrared random laser is obtained by Fe²⁺:ZnSe powders. The Fe²⁺doped ZnSe polycrystal are prepared by vapor phase thermal diffusion method,and the bulk is mechanically grinded into micron-sized powders（10～ 50 μm）. The X ray diffraction（XRD） results indicate that the powders have the same zinc-blende structure as the ZnSe bulk,and the Fe impurity does not change the crystal structure of ZnSe substrate. The PL spectroscopic characterization and temporal profile are studied by a self-made fluorescence testing system under 2. 94 μm excitation of Er:YAG laser at room temperature. As the pump energy increases,the intensity of spectrum is increased abruptly,the linewidth is reduced from 500 nm to 50 nm and the pulse width is decreased from 270 ns to 50 ns. When the pump energy is higher than 2 m J/pulse,typical random laser emissions centering at 4. 45 μm are observed. This mid infrared random laser has a good application prospect in the fields of infrared marking,optical communication and molecular spectrum measurement.更多还原