【摘 要】
：
Two different pulse cleaning techniques for ultra-high contrast laser systems are comparably analysed in this work. The first pulse cleaning technique is based on noncollinear femtosecond optical-parametric amplification (NOPA) and second-harmonic generat
【机 构】
：
StateKeyLaboratoryofHighFieldLaserPhysics,ShanghaiInstituteofOpticsandFineMechanics,ChineseAcademyof
【出 处】
：
HighPowerLaserScienceandEngineering
论文部分内容阅读
Two different pulse cleaning techniques for ultra-high contrast laser systems are comparably analysed in this work. The first pulse cleaning technique is based on noncollinear femtosecond optical-parametric amplification (NOPA) and second-harmonic generation (SHG) processes. The other is based on cross-polarized wave (XPW) generation. With a double chirped pulse amplifier (double-CPA) scheme, although temporal contrast enhancement in a high-intensity femtosecond Ti:sapphire chirped pulse amplification (CPA) laser system can be achieved based on both of the techniques, the two different pulse cleaning techniques still have their own advantages and are suitable for different contrast enhancement requirements of different laser systems.
其他文献
We present an image recognition method to distinguish targets with cat-eye effect from the dynamic background based on target shape and modulation frequency. Original image sequences to be processed are acquired through an imaging mechanism that utilizes
We propose a high sensitivity sensor based on a mode number-encoded multi-longitudinal mode fiber laser. The fiber laser incorporates a uniform fiber Bragg grating (FBG) and a fiber Fabry-Perot interferometer (FFPI) as sensitive components in the cavity.
Asymmetric broad-waveguide separate-confinement heterostructure (BW-SCH) quantum well (QW) laser diode emitting at 808 nm is analyzed and designed theoretically. The dependence of the optical field distribution, vertical far-field angle, and internal loss
提出一种用于顺电相晶体Kerr系数和透射率的数字全息测量方法。该方法是数字记录晶体在不同电压时的全息图，再现数字全息图，得到晶体的复振幅信息，即振幅和相位分布。由晶体的振幅分布获得晶体的透射率；由相位分布得到不同电压差时的折射率变化量，从而计算得到晶体的电光系数。对顺电相Mn0.25%KLTN晶体进行了测量，记录了不同入射光模式以及不同电压时的数字全息图，得到了晶体透射率T和电光系数R11、R12。研究结果表明，该方法可用于顺电相晶体电光系数和透射率的测量，并且对晶体形状，照明光斑大小没有要求。
已研制成配有四级差分泵单元的2.5kW小型壁稳氩弧光源.其光谱辐射稳定性和重复性优于±0.5%,一致性优于±1%.其连续光谱分布可用Hofsaess理论计算,准确度达10%.等离子体光谱学诊断表明:氩弧电流40A、气压1.75×10~5Pa时,等离子体温度为12,650K,电子密度为1.29×10~(17)cm~(-3).
In this article, we report on an experimentally generated soliton and bound-state soliton passively mode-locked erbium-doped fiber laser by incorporating a saturable absorber (SA) made of MoS2/fluorine mica (FM) that was fabricated with the Langmuir–Blodg
为了提高图像压缩的质量,提出量子核函数算法。首先采用自适应灰度阈值使图像归一化处理,用量子比特表示图像白色和黑色状态的出现概率;然后每个像素点的值被编码为量子角度向量;接着构造适应度函数的极小值获得高斯径向基核函数的最优核宽,在量子核影响半径以外的像素量子编码不再起引导作用;最后给出了算法流程。实验仿真显示本文算法的压缩重构效果清晰,PSNR最大,压缩时间最少。
The dispersion of a pair of prisms is analyzed by means of a ray-tracing method operating at other than tip-to-tip propagation of the prisms, taking into consideration the limited spectral bandwidth. The variations of the group delay dispersion and the th
In inertial confinement fusion, the laser–plasma interaction (LPI) happens when the high-energy laser irradi-ates on the target where the scattered light share generated from the stimulated Raman scattering (SRS) effect is difficult to suppress. We propos
日本理化学研究所在世界上首次成功开拓一种移植异种遗传基因的新技术，该技术是将聚焦激光照射到置于显微镜下的活细胞上,细胞膜的透过性瞬间提高，异种遗传基因便被植入细胞内。