HO^(3+)掺杂KYb(WO_4)_2晶体生长与光谱分析

Growth and Spectral Analysis of Ho^(3+) Doped KYb(WO_4)_2 Laser Crystal

以K_2W_2O_7为助熔剂,Ho^(3+)掺杂摩尔分数为9%,采用顶部籽晶提拉法生长出了单斜晶系的钬掺杂钨酸镱钾[Ho^(3+):KYb(WO_4)_2(Ho:KYbW)]晶体。测试了晶体的红外光谱和拉曼(Raman)光谱,并对出现的峰值进行了振动归属。测量了晶体的吸收光谱和荧光光谱,计算了相应的光谱参数。吸收光谱显示,Yb^(3+)在930,987 nm处吸收峰最强,半峰全宽(FWHM)为93 nm。荧光光谱表明,Ho:KYbW晶体在1971和1988 nm附近有较强的发射峰,主峰1988 nm处的发射线宽达71 nm,因此,Ho:KYbW晶体可作为可调谐激光增益介质。晶体的上转换荧光谱表明,在542和647 nm处分别得到了上转换绿光和红光,并分析了相应的上转换机理。

Mole fraction 9%Ho3＋ doped KYb（WO42（Ho：KYbW crystal which belongs to monoclinic system is grown by top seeded solvent growth method using K2W2O7 as a suitable flux.The infrared spectrum and Raman spectrum of the Ho：KYbW crystals are measured,and the assignation of the vibrations of the peak value is determined.The absorption spectrum and fluorescence spectrum of the Ho：KYbW crystal are analyzed and the corresponding spectral parameters are calculated.The absorption spectrum shows that the highest absorption peaks of Yb3＋ are located position at 930 nm and 987 nm and the full-width at half-maximum（FWHM of the peaks reaches 93 nm.The fluorescence spectrum of the Ho：KYbW crystal indicates that the emission wavelengths of fluorescence are 1971 nm and 1988 nm,and the emission FWHM of the chief peak 1988 nm reaches 71 nm,so it is an excellent gain medium for tunable laser.Upconversion fluorescence spectrum of the crystals is measured,the upconversion green light of 542 nm and red light of 647 nm are obtained,and the corresponding upconversion mechanism is analyzed.