Generation of high power laser at 1314 nm from a diode-side-pumped Nd:YLF module

We demonstrate a high power continuous-wave （CW） and acoustic-optically （AO） Q-switched 1314-nm laser with a diode-side-pumped Nd：YLF module. A maximum CW output power of 21.6 W is obtained with a diode pump power of 180 W, corresponding to an optical-to-optical conversion efficiency of 12.0% and a slope efficiency of 16.1%. In the Q-switching operation, a highest pulse energy of 3.8 mJ is obtained at a pulse repetition rate of 1 kHz. The shortest pulse width and maximum single peak power are 101.9 ns and 37.3 kW, respectively.     

Energy spectrum of multi-radiation of X-rays in a low energy Mather-type plasma focus device

The multi-radiation of X-rays was investigated with special attention to their energy spectrum in a Mather-type plasma focus device （operated with argon gas）. The analysis is based on the effect of anomalous resistances. To study the energy spectrum, a four-channel diode X-ray spectrometer was used along with a special set of filters. The filters were suitable for detection of medium range X-rays as well as hard X-rays with energy exceeding 30 keV. The results indicate that the anomalous resistivity effect during the post pinch phase may cause multi-radiation of X-rays with a total duration of 300 ± 50 ns. The significant contribution of Cu-Kα was due to the medium range X-rays, nonetheless, hard X-rays with energies greater than 15 keV also participate in the process. The total emitted X-ray energy in the forms of Cu-K and Cu-K/3 was around 0.14 ± 0.02 （J/Sr） and 0.04 ±0.01 （J/Sr）, respectively. The total energy of the emitted hard X-ray （〉 15 keV） was around 0.12± 0.02 （J/Sr）.     

高强度三次谐波转换对光束质量的影响

分别利用光强对比度和功率谱密度作为激光束的振幅调制和位相畸变的定量描述参量,研究了在高功率条件下,三次谐波转换过程对激光光束质量的影响,详细分析了基频光的光束质量与三倍频光光束质量的定量变化关系.     

罗斯滤片法测量激光打靶X射线辐射通量

利用一套罗斯滤片系统测量激光轰击固体金属Ti平面靶产生的X射线辐射通量,系统包括两个相同的X射线探测器及相应滤膜。罗斯滤片法的优点在于利用相邻核素对X射线相似的阻止率,可滤出一个窄的能带并去除高能部分的干扰,获得了Ti平面靶K壳层X光辐射产额。实验结果表明:硬X射线能段在4.5~4.9keV之间的K壳特征辐射占优,连续谱所占份额较低(与晶体谱仪一致);随着激光能量的增加,特征辐射增加;激光强度接近2×1015 W/cm2时,能量转换效率出现峰值。     

Raman spectrum study of graphite irradiated by swift heavy ions

Highly oriented pyrolytic graphites are irradiated with 40.5-Me V and 67.7-Me V ^112Sn-ions in a wide range of fluences： 1×10^11 ions/cm^2–1×10^14ions/cm^2. Raman spectra in the region between 1200 cm^-1 and 3500cm^-1 show that the disorder induced by Sn-ions increases with ion fluence increasing. However, for the same fluence, the amount of disorder is greater for 40.5-Me V Sn-ions than that observed for 67.7-Me V Sn-ions, even though the latter has a slightly higher value for electronic energy loss. This is explained by the ion velocity effect. Importantly, ～ 3-cm^-1frequency shift toward lower wavenumber for the D band and ～ 6-cm^-1 shift toward lower wavenumber for the 2D band are observed at a fluence of 1×10^14 ions/cm^2, which is consistent with the scenario of radiation-induced strain. The strain formation is interpreted in the context of inelastic thermal spike model, and the change of the 2D band shape at high ion fluence is explained by the accumulation of stacking faults of the graphene layers activated by radiation-induced strain around ion tracks. Moreover,the hexagonal structure around the ion tracks is observed by scanning tunneling microscopy, which confirms that the strains near the ion tracks locally cause electronic decoupling of neighboring graphene layers.     

新型热电子发电机

<正>德国和美国的研究人员开发出一种将热或光转换成电能的新型热电子发电机。新的设计克服了"空间电荷效应问题",这个问题阻碍着实用设备的研制。新型发电机的效率大约是以前的发电机效率的4倍。这种新技术可应用于太阳能发电及废热利用等方面。热电子发电机利用由真空隔开的两块金属板之间的温差来将热或光转换成电流。热的那块金属板由入射光或热传导来加热,使得电子从金属板的表面蒸发     

球磨法对不同基质上转换发光的影响

分别利用高温固相法和高能球磨法,在反应温度为1 100 ℃、反应时间为2 h的条件下合成了以Y₂O₃、La₂O₃、LiTaO₃为基质的双掺和三掺Tm³⁺、Er³⁺、Yb³⁺发光粉。XRD测试结果表明,高能球磨法制备的Y₂O₃、La₂O₃、LiTaO₃材料的相纯度高于高温固相法。用980 nm红外激光分别对两种合成方法制得的样品粉末进行发光性质的检测,结果表明高能球磨法制得样品的发光强度高于高温固相法样品。不同基质样品的上转换发光性质表现为：Tm³⁺、Yb³⁺掺杂呈蓝光;Er³⁺、Yb³⁺掺杂呈黄光;Tm³⁺、Er³⁺、Yb³⁺三掺样品的发光减弱,颜色可调。     

非晶态HoP5O14的蓝绿波段上转换发光的分析

本文报道了脉冲ＤＣＭ染料激光导致的非晶态ＨｏＰ５Ｏ１４的兰绿波段的上转换发光现象，从实验和理论上对其上转换发光的现象，机理和能道行了测量，分析和计算；结果表明对＾５Ｆ３和Ｓ２能级，其上转换发光主要由离间能量传递机理导致；对５Ｇ４和（５Ｇ３Ｇ）５能级，则步进双光子吸收和离子间能量传递共同参与导致了它们的上转换发光。     

阿尔芬波加热托卡马克等离子体的能量平衡问题

本文用“剖面不变性”确定等效电子热导系数,研究了TCA装置上阿尔芬波加热的能量平衡,结果与实验符合很好。证明本文所用的方法对不同装置、不同加热方式都适用。