Sc掺杂Nd:CaF_2激光晶体的结构及其光谱性能参数

采用温度梯度法生长了0.5at%Nd、xat%Sc:CaF_2(x=0,2,5,8)系列晶体,测试了晶体的吸收光谱、荧光光谱和荧光寿命。研究发现发射强度和荧光寿命随着Sc^(3+)离子浓度的增加而提高。通过改变Sc^(3+)离子的浓度发现,当掺杂5at%Sc^(3+)时可以获得最大的吸收截面为1.42×10^(–20) cm^2。另外,掺入Sc^(3+)使共掺晶体在吸收光谱796 nm处产生新峰。综上,通过调节Sc^(3+)离子浓度,可以改变Nd^(3+)离子的局域结构,优化晶体的光谱性能。

Tunable Nd,La:SrF2 laser and passively Q-switched operation based on gold nanobipyramids saturable absorber

A novel Nd, La：SrF_2 disordered crystal is prepared, and its continuous-wave wavelength tuning operation is performed for the first time. Employing a surface plasmon resonance（SPR） based gold nanobipyramids（G-NBPs） saturable absorber,we obtain a compact diode-pumped passively Q-switched Nd, La：SrF_2 laser. The stable Q-switched pulse operates with the shortest pulse duration of 1.15 μs and the maximum repetition rate of 41 k Hz. The corresponding single pulse energy is 2.24 μJ. The results indicate that G-NBPs could be a promising saturable absorber applied to the diode-pumped solid state lasers（DPSSLs）.

Silver nanorods absorber for passively Q-switched Nd,Gd:CaF_(2) laser

Using a novel silver nanorods absorber with a localized surface plasmon resonance absorption peak at 1.06μm,we obtain a diode-pumped passively Q-switched(PQS)Nd,Gd:CaF_(2) disordered crystal laser output.Its PQS pulse laser performances are studied comprehensively and systematically in this Letter.The single pulse energy and peak power can be attained to 2.15μJ and 2.06 W,respectively.