Tm,Ho：BaY2F8晶体光谱性能与能量传递

Spectral Properties and Energy Transfer of Tm,Ho:BaY_2F_8 Crystal

采用提拉法,生长钬铥双掺氟化钇钡[分子式:Tm3+,Ho3+∶BaY2F8,简称Tm,Ho∶BYF]激光晶体。工艺参数:拉速0.5 mm.h-1,转速5 r.min-1,冷却速率10℃.h-1。XRD表明:属于单斜晶系,空间群C12/m1。计算出晶格参数:a=0.69973 nm,b=1.05293 nm,c=0.427 84 nm,β=99.71°。测试了晶体的吸收及荧光光谱,同时计算了784 nm处吸收峰的半高宽、吸收系数及吸收截面,分别为3.2 nm,2.23 cm-1,7.44×10-21 cm2。该吸收峰对应于Tm3+离子从基态3H6到激发态3H4的跃迁。Tm,Ho∶BYF晶体在2.06μm附近有很强的荧光发射峰,在该荧光峰的发射截面和荧光寿命分别为4.96×10-21 cm2,10.1 ms。Tm3+→Ho3+的正向、反向能量转换系数之比是10.4。

Tm,Ho：BaY2F8 single crystal was grown by the Czochralski method for the first time.The optimaltechnical parameters obtained are as follows：the pulling rate is 0.5 mm.h-1,the rotation rate is 5 r.min-1,thecooling speed is 10 ℃.h-1.The result of XRD curve shows that as-grown Tm,Ho∶BaY2F8 crystal belongs to themonoclinic system with scheelite-type structure and space group C12/m1.The cell parameters calculated are a=0.699 73 nm,b=1.052 93 nm,c=0.427 84 nm,β=99.71°.The absorption and fluorescence spectra of the Tm,Ho∶BaY2F8 crystal were measured.and FWHM,absorption coefficient,absorption cross-section were calculated lying inthe 784 nm region,3.2 nm,2.26 cm-1 and 7.44×10-21 cm2,respectively.Transition from the 3H6 ground state to3H4 excited state with Tm3＋.There are three intensive fluorescence emission peak near 2.06 μm,the emissioncross-section and fluorescence lift time 4.96×10-21 cm2 and 10.1 ms,respectively.The ratio between the Tm-Hotransfer and its back-transfer process is 10.4.