【摘 要】
：
A high power narrow-linewidth nanosecond all-fiber laser based on the master oscillator power amplifier (MOPA) configuration is demonstrated. A pulsed seed with high repetition rate of 10 MHz was generated by modulating a continuous-wave (CW) single-frequ
【机 构】
：
CollegeofOptoelectronicScienceandEngineering,NationalUniversityofDefenseTechnology,Changsha410073,Ch
【出 处】
：
HighPowerLaserScienceandEngineering
论文部分内容阅读
A high power narrow-linewidth nanosecond all-fiber laser based on the master oscillator power amplifier (MOPA) configuration is demonstrated. A pulsed seed with high repetition rate of 10 MHz was generated by modulating a continuous-wave (CW) single-frequency fiber laser at 1064 nm by using an electro-optic intensity modulator (EOIM). After multi-stage cascaded power amplification, the average power was boosted to be kilowatt level. The pulses from the main amplifier had a pulse width of 3 ns and an average/peak power of 913 W/28.6 kW. Further power scaling of the pulses was limited by stimulated Raman scattering (SRS) for the moment, method for SRS suppression and further power scaling was briefly discussed.
其他文献
提出一种基于多频段区域互信息(MRMI)的光学成像系统性能评价方法。由信息论出发,结合人类视觉系统(HVS)分频感知原理,利用小波变换将物面与像面图像分解为多个频段,分别计算各频段区域互信息(RMI),再由小波滤波器和MTF的空间频段积分比计算各频段RMI的权重系数,加权综合得到多频段区域互信息(MRMI)。实验分析了具有不同像散度的光学系统点光源成像,最终得到的评价参数MRMI随着光学系统像散度
Diode-laser pumped monolithic single-frequency non-planar ring laser has the advantages of compactness, reliability and high efficiency. But when the pump power is high enough, the thermal effect will be serious and the high-order transverse modes will ap
在氙等离子体柱的动力学压缩期间，已发现三次电离的氙出现激射。已探测到近紫外到橙色波段上的激光谱线。测量了它们的峰值功率、发生时间、持续时间、波长和相干长度。找到了最佳电流和压力，并与別的公布结果进行了此较。此外，使用了箍縮等离子体的简化模型，以及收缩柱的扫描摄影机照片和电子密度的对间分辨干涉测量结果，用以估计电子的温度。氙等离子体的电子密度、温度和电导率的值与公布的强电洸脉冲氩离子激光嚣的结果非常接近。
高动态范围成像已经成为数字显微镜发展的一大趋势。目前视频级高动态范围显微成像技术由于计算复杂度较高, 还无法做到实时处理和显示。提出利用高清电视领域中的 REC.2020色域变换, 结合 GPU实时加速处理技术, 成功实现了高动态范围显微图像视频流的实时显示, 图像具有良好的色彩还原性和细节恢复性。实验结果表明, 设计的算法不仅能够提供稳定的高清、高动态范围视频, 其细节和色彩还原性也有了很大的提高, 突破了传统的高动态范围图像技术在成像速度和质量方面的限制。
第一台用高效全息摄影装置偏转和探测激光的超级市场扫描装置已由国际商业机器公司制造和安装。
采用动电位极化曲线和电化学阻抗谱研究了激光选区熔化成形CP-Ti和Ti-5%TiN复合材料在人工模拟体液Hank溶液中的腐蚀性能,结果表明:激光选区熔化成形CP-Ti主要由针状α-Ti相组成,加入的TiN颗粒不仅可以与钛基体形成良好的界面结合,还可以细化α-Ti晶粒并产生更多的晶界;在Hank溶液中,激光选区熔化成形Ti-5%TiN复合材料具有比激光选区熔化成形CP-Ti更好的耐腐蚀性能,这是因为作为微阴极的TiN颗粒均匀地分布在钛基体内,可以加速钛基体的阳极溶解过程,使Ti-5%TiN复合材料能够优先进
We propose and experimentally validate an optical true time delay beamforming scheme with straightforward integration into hybrid optical/millimeter (mm)-wave access networks. In the proposed approach, the most complex functions, including the beamforming
激光辐射在地球至宇宙间通道内大气衰减的测量，是在实验上遇到困难的问题。我们研制了能在HF和DF激光波长下作这些测量的以地球为基地的系统。将介绍几条激光谱线的实验结果。吸收测量系统的中心是接近量子噪声极限的光学外差辐射计。
Scanner color management is one of the key techniques for color reproduction in information optics. A new scanner color management model is presented based on analyzing rendering principle of scanning objects. In this model, a standard color target is tak