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Cr,Nd:GSAG是一种性能优良的激光晶体,但是关于它的LD泵浦激光性能的研究很少。用提拉法生长了Cr,Nd:GSAG晶体,测定了它的化学成分、结构,初步测试了它的激光性能。晶体的(111)面X射线摇摆曲线半高全宽为0.055°。采用Rietveld方法精修X射线粉末衍射谱得到了Cr,Nd:GSAG晶体的原子结构参数、温度因子等。Cr,Nd:GSAG的最强吸收峰位于808.6 nm处,吸收截面为3.38×10-20cm2。808 nm光激发下,Cr,Nd:GSAG的最强发射峰位于1060 nm,发射截面为6.04×10-20cm2,并测得激光上能级4F3/2的荧光寿命为274μs。利用808nm连续波LD泵浦实现了1060 nm的激光输出,在输入功率为8.88 W时,最大输出功率为0.513 W,斜效率为6.73%,光-光转换效率为5.78%。此外还讨论了Cr,Nd:GSAG晶体中的Cr~(3+)与Nd~(3+)之间的能量传递机理。
Cr, Nd: GSAG is a good performance laser crystal, but little research has been done on its LD-pumped laser performance. The Cr, Nd: GSAG crystals were grown by Czochralski method. The chemical composition and structure of Cr, Nd: GSAG were measured and its laser performance was preliminary tested. The FWHM of the (111) plane X-ray rocking curve of the crystal is 0.055 °. The atomic structure parameters and temperature factors of Cr, Nd: GSAG crystals were obtained by X-ray powder diffraction (XRD) spectroscopy using the Rietveld method. The strongest absorption peak of Cr and Nd: GSAG is at 808.6 nm and the absorption cross section is 3.38 × 10-20 cm2.808 nm, the strongest emission peak of Cr and Nd: GSAG is at 1060 nm and the emission cross section is 6.04 × 10 -20cm2, and the measured fluorescence level 4F3 / 2 of the fluorescence life of 274μs. The laser output of 1060 nm was achieved by using 808nm CW LD pump. The maximum output power was 0.513 W at the input power of 8.88 W, the slope efficiency was 6.73%, and the light-to-light conversion efficiency was 5.78%. In addition, the energy transfer mechanism between Cr 3+ and Nd 3+ in Cr and Nd: GSAG crystals is also discussed.