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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。
Using Ho_2 (superscript 3+) as flux, the molar fraction of Ho 3+ doped was 9%, and the monoclinic holmium doped ytterbium tungstate [Ho 3+: KYb (WO_4) _2 (Ho: KYbW)] crystals. The crystal’s infrared spectrum and Raman spectrum were tested, and the peaks appearing were assigned to vibration. The absorption and fluorescence spectra of the crystals were measured and the corresponding spectral parameters were calculated. Absorption spectra showed that Yb ~ (3+) had the strongest absorption peak at 930,987 nm and full width at half maximum (FWHM) of 93 nm. Fluorescence spectra show that the Ho: KYbW crystal has a strong emission peak near 1971 and 1988 nm, and the emission line width at the main peak at 1988 nm is 71 nm. Therefore, Ho: KYbW crystal can be used as tunable laser gain medium. Upconversion fluorescence spectra of the crystals show that the upconversion green and red light are obtained at 542 and 647 nm, respectively, and the corresponding upconversion mechanism is analyzed.