Wu K, Hao L Z, Yu H H, Wang Z P, Wang J Y, Zhang H J
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
Opt Express. 2012 Mar 26;20(7):6944-51. doi: 10.1364/OE.20.006944.
We measured the thermal properties of Nd:Lu₃Sc₁.₅Ga₃.₅O₁₂ (Nd:LuSGG) crystal, including the thermal expansion coefficient, specific heat, and thermal diffusion coefficient. The calculated thermal conductivity is 4.4 W/mK at room temperature. A high-power continuous-wave and passively Q-switched Nd:LuSGG laser was also demonstrated. Continuous-wave output power of 6.96 W is obtained which is the highest power with this material. For the first time to our knowledge, the passively Q-switched Nd:LuSGG laser is reported with the shortest pulse width, largest pulse energy, and highest peak power are achieved to be 5.1 ns, 62.5 μJ, and 12 kW, respectively. By spectral analysis, it has been found that the Nd:LuSGG laser was located at 1059 nm under low pump power, and became dual-wavelength at 1061.5 and 1059 nm when the incident pump power is over 2.27 W. The generating mechanism of dual-wavelength laser is also discussed.
我们测量了钕掺杂钇镓石榴石晶体（Nd:Lu₃Sc₁.₅Ga₃.₅O₁₂，Nd:LuSGG）的热学性质，包括热膨胀系数、比热容和热扩散系数。室温下计算得到的热导率为4.4W/(m·K)。还展示了一台高功率连续波和被动调Q的Nd:LuSGG激光器。获得了6.96W的连续波输出功率，这是该材料的最高功率。据我们所知，首次报道了被动调Q的Nd:LuSGG激光器，其最短脉冲宽度、最大脉冲能量和最高峰值功率分别达到5.1ns、62.5μJ和12kW。通过光谱分析发现，在低泵浦功率下，Nd:LuSGG激光器位于1059nm波长处，当入射泵浦功率超过2.27W时，变为1061.5nm和1059nm的双波长。还讨论了双波长激光的产生机制。
