【摘要】 通过研究分析钨酸盐晶体Nd∶KY(WO4)2和Nd∶KG(WO4)2在室温下的吸收光谱,发现这2种晶体具有作为激光晶体的优良特性。根据Judd-Ofelt理论和测试所得的吸收光谱及数据,用VC++编程计算出晶体的谱线强度、振子强度、吸收截面等,拟合得Nd3+离子的3个晶场调节参数Ωλ(λ=2,4,6)的值,并从理论上计算了自发跃迁几率、能级寿命、荧光分支比和积分发射截面。从计算得出的荧光分支比β可以看出,Nd∶KY(WO4)2(β1060nm=0.438 0)和Nd∶KG(WO4)2(β1060nm=0.461 8)晶体荧光分支比都较大,计算了该晶体的X=Ω4/Ω6,并将其X值与其他晶体的X值加以比较,Nd∶KY(WO4)2和Nd∶KG(WO4)2均易于实现1.06μm激光输出,适合作为LD泵浦的钨酸盐晶体激光器。更多还原

【Abstract】 Nd∶KY(WO4)2 and Nd∶KG(WO4)2 crystals are proved to be good laser crystals through the analysis of their absorption spectrum at room temperature.According to the absorption spectrum and data derived from Judd-Ofelt theory as well as measured absorption and data obtained from the test,VC++ program was used to calculate the intensity of spectral line,oscillator strength and absorption cross-section of the crystals.Then the values of three crystal-field adjusting parameters Ωλ(λ=2,4,6) of Nd3+ ion were obtained by fitting calculation.The spontaneous transition probability,energy level lifetime,fluorescence branch ratio and integrated emission cross-section were calculated theoretically.The calculated fluorescence branch ratio β indicates that the fluorescence branch ratios of both Nd∶KY(WO4)2(β1060nm=0.4380) and Nd∶KG(WO4)2(β1060nm=0.4618) crystals are large.At last,X=Ω4/Ω6 of Nd∶KY(WO4)2 and Nd∶KG(WO4)2 crystals were calculated and compared with those of other laser crystals.It is concluded that Nd∶KY(WO4)2and Nd∶KG(WO4)2crystals can produce 1060nm laser.更多还原