Passively Q-switched ytterbium-doped fiber lasers (YDFLs) incorporating a molybdenum
Here we study theoretically the optical responses of hybrid structures composed of dielectric nanostructures and quantum emitters with magnetic dipole transitions. Coherent couplings between magnetic dipole transitions and magnetic modes can occur, leadin
为了在影像学检查中实时交互地提取病灶血管的四维计算机断层扫描(CT)影像,提出了一种思维进化算法(MEA)优化的并行区域生长算法;MEA优化的基于三级线程处理队列的并行区域生长算法能够通过自我进化避免局部最优,提高了收敛速度和血管分割精度,借助可视化工具包(VTK)和计算机图形图像类库,实现交互式心脏CT局部任意血管病灶的提取和四维可视化。结果表明:局部感兴趣血管10个时相的提取时间大大缩短,体绘
We report femtosecond pulse generation in an amplifier similariton oscillator and a prechirped fiber amplifier system. The final output power is 1.4 W, and the fundamental repetition rate is 19.1 MHz after a single state fiber amplifier. The pulsewidth is
设计和研制了一台石英毛细管波导型H2喇曼池,用450nm染料激光研究了H2的受激振动喇曼散射,测定了一阶Stokes波输出能量与H2气压之间的依赖关系。最高能量转换效率为20%。用Oxazine-1染料激光作泵浦源获得三阶Stokes信号,得到的红外喇曼散射最长波长达6.57μm。
本文报道用一台对撞脉冲锁模Nd:YAG激光器的三倍频光作为泵浦光源,采用超短腔结构,获得叶绿素的红色ps脉冲激光输出的装置和实验结果。研究了叶绿素a和b在各种聚合状态下输出激光波长随染料浓度的变化关系,当叶绿素a-乙醇溶液浓度为2×10~(-3)M,激光腔长
We report on a radially polarized and passively Q-switched Nd:YAG/Cr4 :YAG laser. The bulk Nd:YAG crystal is bonded with two undoped YAG crystal end caps to weaken the thermal lens e ect and thus, enhance the extraction of stored energy in the bulk gain m
A camera-based model is established to predict the total difference for samples of metallic panels with effect coatings under directional illumination, and the testing results indicate that the model can precisely predict the total difference between samp
在多束激光辐照靶的实验中,时间同步是十分重要的。我们用双光子荧光(TPF)法测量了六束钕玻璃高功率激光系统(6×10~(11)W)的时间同步。测量时间同步的光源是该激光系统中的主被动锁模Nd~(3 )∶YAG振荡器,脉宽是20ps。 相对辐照的二束激光的时间同步测量,采用了在靶位处放置一个四面通光的双光子荧光盒,而正交辐照的二束激光的时间同步测量,采用了在靶位处放置一个半透膜板和一个双光子荧光装置。时间同步测量简便、直观。 给出了用双光子荧光法测量时间同步的误差。两束激光相对辐照时,同步误差为4ps,两束