KTP倍频晶体增透膜的改进

为了改进KTP晶体倍频增透膜的镀膜质量,采用SiO2代替原来使用的MgF2材料作外层膜并重新设计了膜系。实验结果表明,运用上述技术将镀有1064nm和532nm增透膜的KTP倍频晶体应用在高功率Nd:YAG激光器中,当重复频率lkHz、脉宽25ns、基波功率密度高达450MW/cm2时,没有观察到KTP晶体表面激光损伤,膜层表面抗激光损伤和光学性能都得到提高。     

Nd:GdCOB晶体实现被动调Q运转

掺钕三硼酸钙氧钆[Nd3 :GdCa4O(BO3)3,简称Nd:GdCOB]是一种新型的自激活自倍频晶体,具有非线性系数大、损伤阈值高、对倍频光吸收小以及用提拉法能够生长大尺寸高质量晶体等优点,一问世就受到人们极大关注。该晶体在500～840nm范围内有众多吸收峰,因而既适合于用钛宝石激光抽运、激光二极管抽运、染料激光抽运,又适合于用闪光灯抽运。我们采用闪光灯抽运,用Cr4 :YAG作饱和吸收体,实现了Nd:GdCOB晶体的被动调Q运转。所用谐振腔为平凹腔,后腔镜为曲率半径100cm的凹面镜,对1.06μm和0.53μm光均高反;输出镜为平面镜,对1.06μm高反,对0…     

电子辅助热丝CVD法合成金刚石膜

本文采用电子辅助热丝化学气相沉积法合成了厚度为４４０μｍ的金刚石膜。实验结果表明，适当地选择和控制各种沉积参数，可获得高质量的金刚石膜。本文还分析和讨论了基板温度、偏流、压强和甲烷浓度对金刚石膜质量的影响以及它们之间的相互关系。     

LD抽运Nd:LuVO4微片激光器性能研究

报道了一类新型的LD端面抽运Nd：LuVO₄微片激光器，讨论了在不同掺杂浓度，不同厚度和不同透过率下的激光性质，测定了在不同抽运功率下，微片最佳激光输出功率与LD抽运温度的关系.在2W抽运功率下获得923mW的1064nm激光输出，阈值为48mW，斜效率为52%.对微片制冷后斜效率提高到59%. 关键词： LD抽运 微片激光器 4')" href="#">Nd：LuVO₄     

Wildly Tunable,High-Efficiency MgO：PPLN Mid-IR Optical Parametric Oscillator Pumped by a Yb-Fiber Laser

We demonstrate a wildly tunable, high-eFficiency mid-infrared （mid-IR） output-coupled single resonant optical parametric oscillator （OC-SRO） pumped by a Yb-fiber laser. The compact mid-infrared source employs a 50- mm-long, multi-grating MgO-doped periodically poled lithium niobate （MgO-PPLN） crystal, providing as much as 1.73 W idler power at 3.012#m, and 1.27W signal power at 1645nm, corresponding to an overall conversion efficiency of 41.7% and a slope efficiency of 77.9%. In particular, the mid-infrared output power of 1.03 W and 0.67W are obtained at 3.7μm and 3.9μm, respectively, with an optical-to-optical conversion efficiency of 14.3% and 9.3%. Furthermore, the idler light is tunable from 3 μm to 3.9 μm by changing the periods from 31 to 28.5μm, with the output power 〉1 W over 78% of the tuning range. Our experimental results are pump power limited and further mid-IR power and conversion efficiency could be obtained with a suitable high-power pump source. The total OC-SRO output power rms at 2.6 W is about 0.6% during 2 h measurement.