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泡生法生长KYb(WO4)2晶体及其结构与光谱性能
Structure and Spectra Characteristics of KYb(WO4)2 Crystal Grown by Kyropoulos Method
【摘要】 对顶部籽晶提拉法(TSSG)进行了改进,采用泡生法生长KYb(WO4)2晶体(简称KYbW),以0.05℃/h的速率降温生长,转速5~10 r/min,生长周期10~15 d,降温速率15~20℃/h。研究了KYbW晶体的结构,给出了两种晶胞的选取方法。通过晶体的X射线衍射(XRD)谱,计算出晶体的两种晶格常数分别为a=1.061 nm,b=1.029 nm,c=0.749 nm,β=130.65°;a′=0.807 nm,b′=1.029 nm,c′=0.749 nm,β′=94.34°。测得晶体的吸收光谱,结果表明其吸收带在920~1000 nm,计算出主吸收峰981 nm处的吸收截面为11.12×10-20cm2。测得晶体的荧光光谱,结果表明KYbW晶体在1007 nm和1037 nm附近都有较强的发射峰,主峰1037 nm处的发射线宽(FWHM)达13 nm,因此KYbW晶体可作为可调谐激光增益介质,计算出1037 nm处的受激发射截面积eσm=3.4×10-20cm2。
【Abstract】 In this paper,KYb(WO4)2(KYbW) crystal has been grown by Kyropoulos method,and the craft parameters were obtained,cooling growth at(0.05 ℃/h,) rotational speed was(10 r/min,) growth period was 10~(15 d,) and lower the temperature at 15~(20 ℃/h.) The crystal structure was studied,and two ideas for accessing unit cell were presented.The lattice parameters of KYbW were,a=(1.061 nm,) b=(1.029 nm,) c=(0.749 nm,) β=130.65° and a′=(0.807 nm,) b′=(1.029 nm,)c′=(0.749 nm,)β′=94.34° calculated by X-ray diffraction(XRD) analysis.The absorption spectrum and fluorescence spectrum of KYbW were measured. The absorption cross section at(981 nm) was calculated to be(11.12×10-20 cm2.) The emission wavelength of fluorescence was(1007 nm) and(1037 nm,) and the emission line-width at the chief peak(1037 nm) run up to(13 nm,) so KYbW was an excellent gain medium for tunable laser.The emission cross section at(1037 nm) was calculated as(3.4×10-20 cm2.)
【Key words】 materials; KYb(WO4)2 crystal; Kyropoulos method; cell parameters; spectral performance;
- 【文献出处】 中国激光 ,Chinese Journal of Lasers , 编辑部邮箱 ,2006年05期
- 【分类号】O782;O734
- 【被引频次】13
- 【下载频次】150