In an experiment performed on the Shenguang-III prototype laser facility, collective Thomson scattering (TS) is used to study the spatial growth of stimulated Brillouin scattering (SBS) in a gas-filled hohlraum by detecting the SBS-driven ion acoustic wave. High-quality time-resolved SBS and TS spectra are obtained simultaneously in the experiment, and these are analyzed by a steady-state code based on the ray-tracing model. The analysis indicates that ion–ion collisions may play an important role in suppressing SBS growth in the Au plasma; as a result, the SBS excited in the filled gas region is dominant. In the early phase of the laser pulse, SBS originates primarily from the high-density plasma at the edges of the interaction beam channel, which is piled up by the heating of the interaction beam. Throughout the duration of the laser pulse, the presence of the TS probe beam might mitigate SBS by perturbing the density distribution around the region overlapping with the interaction beam.

提出了一种无波长校正的光纤布拉格光栅（FBG）传感系统，可在未对基于重构等效啁啾（REC）技术制造的扫频DFB激光器进行波长线性校正的情况下，识别波长变化，并解调出光栅传感器的温度变化。所提无波长校正FBG传感系统可以在200 ℃范围内进行精确的温度检测，测得的波长与温度的线性系数1－R²仅为0.004 4。该传感系统光源在1 kHz的锯齿波调制下，调谐范围可达2.5 nm，且测量过程中无需额外波长校正器件。

随着我国核辐射技术的进步, 辐射探测在近些年也得到了高速发展, 并被广泛应用于辐射安全监测、放射性医学诊疗、X射线安监系统、工业无损探伤以及微观粒子轨迹探测等诸多领域。辐射光致发光(Radio- photoluminescence, RPL)是一种在电离辐射作用下, 材料内部产生新的发光中心, 并被紫外光激发进而发光的现象, 可作为一种新型辐射探测手段。RPL材料通常具有存储辐射信息、信息几乎不衰减、剂量线性响应好、均匀稳定的高辐射灵敏度、能量依赖性小和可重复读数等特点, 弥补了光释光(Optically stimulated luminescence, OSL)和热释光(Thermally stimulated luminescence, TSL)材料在存储稳定性和重复使用性等方面的不足。自RPL现象被报道以来, RPL材料层出不穷, 如传统的Ag掺杂磷酸盐玻璃、Al₂O₃:C,Mg和LiF, 再到新型的Cu离子掺杂体系、Sm离子掺杂体系以及无掺杂体系材料等。同时, RPL应用也被不断发掘, 目前它已成为辐射探测领域不可或缺的材料之一。基于此, 本文概述了RPL材料的最新进展, 重点梳理了传统和新型RPL材料的发光原理、性能特点及其应用, 特别对比了不同RPL材料在辐射探测性能方面的差异。最后, 本文对RPL材料的优势及其不足之处进行了归纳分析, 并对其发展趋势进行了展望。