Desighn and Development of Infrared-to-Visible Upconversion Rare Earth Laser

我们在以下几个方面取得了研究成果：首次在红外AlGaAs激光器800 nm辐射下，在掺Er~(2+)的重金属氧化物玻璃中观察到了有效的可见上转换。在声子边带光谱中观察到，上转换效率随声子能量与基质玻璃中稀土离子的耦合而变化。650 nm泵浦DCM-染料激光，Tm^&lt；3&gt；掺杂玻璃呈现出紫外光和蓝光上转换。Tm^&lt；3&gt；上转换的主要机制是两种激发能级的激发态吸收，明确了氧化物和几种氟化物玻璃中Er^&lt；3&gt；和Nd^&lt；3&gt；离子强度参数的控制因素。在三个omega_t参数中，对于相同组成的玻璃，在穆斯堡尔效应测量中，omega_6与^&lt；151和gt；Eu；Eu异构体位移之间有很强的相关性。这些现象可以通过6S电子对5dorbary的屏蔽效应得到很好的解释，6s电子的密度通过稀土与配位键的共价效应而增加。

We have obtained several research results listed below.It was possible for the first time to ovserve efficient visible upconverion in Er^<3+> doped heavy metal oxide glasses by 800nm radiation of infrared AlGaAs laser diode.The upconversion efficiency was found to vary with the phonon energy coupled with the rare earth ions in the host glass, which was observed in the phonon sideband spectra.The Tm^<3+> doped glasses exhibit uv and blue upconversion by 650nm pumping of DCM-dye laser. The main mechanism of Tm^<3+> upconversions was excited state absorption from two kinds of excited levels.Teh controlling factors of Judd-Ofelt intensity parameters were made clear for Er^<3+> and Nd^<3+> ions in oxide and several fluoride glasses. Among three OMEGA_t parameters, the OMEGA_6 showed a strong correlation between the ^<151>Eu isomer shift in Mossbauer effect measurement for the glass with the same composition. These phenomena could be well explained by the shielding effect on the 5dorbital by the 6s electron, the density of which is increased by the covalency effect of rare earth and ligand bond.