We first study the effect of cavity modes propagating in the lateral dimension on high-power semiconductor lasers with a large stripe width. A sidewall microstructure was fabricated to prevent optical feedback of lateral resonant modes. Theoretically, we demonstrate the existence of lateral resonant modes in the Fabry–Perot cavity with a large stripe width. Experimentally, we design the corresponding devices and compare them with conventional broad-area diode lasers. About a 15% reduction in threshold current and a 27% increase in maximum electro-optical conversion efficiency are achieved. The amplified spontaneous emission spectrum is narrowed, which proves that lateral microstructures suppress optical feedback of lateral resonant modes. Under a large continuous-wave operation, the maximum output power of laser device is 43.03 W, about 1 W higher than that of the standard broad-area laser at 48 A.

放射性废油是核电机组运行产生的有机“疑难废物”之一，针对该类废物开发了基于氧化老化法的核素分离净化处理工艺，研制一套放射性废油核素分离净化处理工程装置并实现了工程应用。结果表明：氧化老化工艺去污系数可达两个量级以上；使用工程装置处理后的废油达到清洁解控水平，可作为普通危险废物进行管理；处理后废油焚烧供热过程（包括运输）中可能造成的额外附加剂量远远低于剂量限值，满足再利用过程的剂量准则，符合废物最小化原则。

激光通信以其带宽大、保密性好、无频谱限制等特点成为构建空天地海全域网络高速通信有效技术途径。相较天基而言，搭载在气球、飞艇、无人机、飞机等平台的空基激光通信系统以其灵活性好、成本低、可维修等特点，成为高保密军用战术网络、救灾应急网络、商用低成本网络的首选。详细介绍了美国、德国、法国、中国等空基激光通信技术最新研究进展和主要项目的参数指标，总结了一对多、轻量化、高带宽等发展趋势和面临的大气信道复杂、背景噪声严重等技术挑战，提出了高动态捕跟、高密度集成、高灵敏度接收等关键技术措施，为空基激光通信技术研究和工程项目研制提供参考。

A high peak power density and low mechanical stress photonic-band-crystal (PBC) diode laser array based on non-soldered packaging technology is demonstrated. The array consists of the PBC diode laser bars with small fast axis divergence angles. Meanwhile, we design the non-soldered array structure that realizes mechanical stacking of 10 bars in the vertical direction. In the experiment, the peak power density of the PBC array is about 1.75 times that of the conventional array when the same total power is obtained. The peak power of the non-soldered array is 292.2 W, and the “smile” effect is improved by adjusting the mechanical fixing force of the array.

We studied the spectral beam combining (SBC) of a large optical cavity (LOC) laser array to achieve high-power and high-brightness laser output. We discussed the characteristics of the external cavity feedback efficiency and the focal length of the transform lens for lasers with different waveguide thicknesses. We have found that using LOC laser diodes can increase the proportion of external cavity feedback, thereby improving the SBC efficiency. At a current of 90 A, the CW output power of the SBC system is 59.2 W, and the SBC efficiency reaches up to 102.8%. All emitters of the laser array have achieved spectral locking with a spectral width of 11.67 nm, and the beam parameter product is 4.38 mm·mrad.

铁锰结核是具有高反应活性的矿物复合体; 与海洋铁锰结核不同, 土壤铁锰结核常在干湿交替、 水气干扰条件下存在, 形成了独具特色的地球化学特征。 作为土壤“新生体”, 不同地区铁锰结核常表现出较大差异。 研究典型区域土壤铁锰结核与重金属的结合行为, 有助于深入了解铁锰结核的微生态属性, 对于后续土壤的开发利用、 保育改良、 污染修复等都具有战略性指导意义。 目前, 关于中国西部地区土壤铁锰结核的相关研究极少, 本研究有望从光谱学层面弥补领域不足、 充实科学体系。 采用水洗法获得西部地区土壤铁锰结核, 使用电感耦合等离子体发射光谱(ICP-OES)、 紫外-可见光谱(UV-Vis)、 X射线衍射(XRD)和傅里叶变换红外光谱(FTIR)表征铁锰结核主量元素和结构特点。 通过静态批次实验考察铁锰结核与Cd的结合行为, 探讨时间、 Cd溶液浓度和温度对吸附的影响, 引入动力学方程和等温线方程拟合反应过程, 计算热动力学参数并探讨吸附后铁锰结核的洗脱可能性。 不同粒径铁锰结核主量元素氧化物都以Fe₂O₃, SiO₂, Al₂O₃, MnO为主, Fe₂O₃含量最高, SiO₂次之; 铁锰结核与土壤基质的矿物组成高度相似, FTIR图谱证实—OH, Si—O—Si (Al), Fe(Mn)—O等基团的存在。 吸附过程总体表现为“先快后慢”: 反应6 h后的吸附量Q为4.96 mg·g^-1, 至12 h后吸附效果趋于不变。 Cd溶液浓度的增加有助于吸附量Q的升高, 温度对吸附反应的影响较小。 准二级动力学方程可以更好地拟合吸附反应(R²为0.994 3), 说明化学吸附为控速步骤。 Langmuir方程的拟合系数(R²为0.999 1)高于Freundlich方程, 表明吸附反应属于单分子层化学吸附。 吸附过程自发、 吸热且存在络合性吸附, 反应后体系混乱度增加。 由自来水配制的0.1 mol·L^-1 HCl溶液的洗脱效果更好。 本研究可以为后续(光谱层面的)反应机制剖析提供基础数据。

We design a 645 nm laser diode (LD) with a narrow vertical beam divergence angle based on the mode expansion layer. The vertical beam divergence of 10.94° at full width at half-maximum is realized under 1.5 A continuous-wave operation, which is the smallest vertical beam divergence for such an LD based on the mode expansion layer, to the best of our knowledge. The threshold current and output power are 1.07 A and 0.94 W, limited by the thermal rollover for the 100 µm wide and 1500 µm long broad area laser, and the slope efficiency is 0.71 W/A. The low coherence device is fabricated with the speckle contrast of 3.6% and good directional emission. Such 645 nm LDs have promising applications in laser display.