Ar的第三谱带240nm中心谱区与气压关系的实验观察

采用强流相对论电子束横向泵浦纯氩,获得了属于Ar的第三谱带范围内240nm中心谱区的光强随气压变化的关系.结果表明,压强为3×10⁵Pa时是产生这一谱区的最佳气压,并证实了这一谱区是由带电的原子团簇产生的.     

强光场中原子的电离速率

以静态场隧道电离为基础,在准静态近似的条件下,对描述强光场中原子及其各阶离子电离的电离速率进行了较为系统的总结,纠正了早期对隧道电离的电离速率公式进行讨论并且后来的计算中被广泛引用的文献「１０」中公式的错误,地部分稀有气体原子及其各了子在线偏振、圆偏振强光场中的了速度及相应的阈值光强进行了比较。     

放电参数对毛细管放电泵浦的软X射线激光的影响

 以哈尔滨工业大学可调谐激光技术国家重点实验室中的Marx发生器的放电脉冲波形为基础,理论上模拟计算了在不同放电参数下充氩气的毛细管放电产生的等离子体状态和类氖氩离子3p_3s跃迁线的增益系数的时空演变过程。中心模型中,选取内径为3.1 mm 的陶瓷毛细管并充入初始密度为1.07×10^-6g·cm^-3的氩气,电流脉冲峰值为27.81 kA,脉冲宽度为61.4 ns。改变放电参数进行模拟,结果表明：上升前沿越陡,则增益系数越大,电流脉冲上升时间在20~40 ns,电流峰值在25~40 kA,电流脉冲宽度在50~70 ns范围内,毛细管放电产生的等离子体状态比较理想,可获得较高的增益系数。     

钾双原子分子21∑+u─x1∑+sub>g跃迁连续谱带研究

理论计算了钾双原子分子21∑+ｕ─ｘ1∑+ｇ跃迁所得到的扩散带荧光谱，并与Gondal等[4]和Luh等[5]以及Milosevic等[6]的实验结果进行了比较。计算结果与Luh等和Milosevic等的实验结果符合很好，排除了600 nm附近扩散带来自Ｋ221∑+ｕ─ｘ1∑+ｇ跃迁的可能性。     

毛细管放电软X光激光预-主脉冲延时电路

 以预-主脉冲方式工作的激励软X光激光毛细管放电装置，其预-主脉冲先后触发时间间隔的控制，直接影响了泵浦能量转换为X射线激光能量的效率。运用光电耦合及脉冲变压器隔离等技术，将集成芯片构成的延时电路用于快速高压放电装置中。实验结果表明，预-主脉冲协调工作，延时触发2～50μs，为产生软X光激光提供了条件。     

激励软X光激光的毛细管预-主脉冲放电装置

 介绍了主脉冲和预脉冲的产生电路、预-主脉冲延时触发的方案以及对预-主脉冲的联调结果。毛细管放电X光激光装置经改造后，抑制了原有电流幅值过大的预脉冲，外加预脉冲发生器可以提供幅值几十A的预脉冲。预 主脉冲的联调结果表明，预脉冲的电流为20A，主脉冲的第一个峰的峰值电流为40.1kA，前沿为26.6ns，脉宽38ns，预-主脉冲之间的触发延时在3～50μs之间可调。     

相干激光雷达图像散斑噪声抑制算法

提出了一种新的用于散斑噪声抑制的非线性加权均值多方向形态滤波算法。运用此算法和先前提出的散斑噪声抑制算法以及小波软阈值算法和Lee滤波算法一并对相干激光雷达图像进行了噪声抑制处理，并且对处理的结果进行了比较，证明了本算法的进步，即在不降低噪声抑制能力的前提下，较好地保持了图像边缘。     

High-order harmonics in static gas target by 795-nm Ti:sapphire femtosecond laser pulses

The 5th-23sd high-order harmonics generation in rare gases in static gas target with 120-fs, 85-mJ/pulse, 10-Hz laser system was investigated. Compared with the traditional gas target, static gas target is simple to be used in experiment, and the experimental parameters can be easily controlled. The effects on high-order harmonics due to laser intensities (energy), polarization, gas densities, confocal parameter, and phase mismatch were studied in this paper.     

Compact waveguide CO2 laser excited by a RF power supply

The design and performance of radio frequency (RF) excited partial Z-fold waveguide CO2 laser with two channels are exposed. The length of the partial Z-fold channel is 3×460 mm and that of the single channel is 460 mm. The electrodes for the two channels are common and excited by a same RF source. According to our analysis, this kind of structure can greatly improve the laser offset frequency stability. In the experiments, we studied the variation of laser output power with gas pressure for two different channels.The maximum laser output power is about 23 W for the partial Z-fold channel and about 6 W for the single channel.     

Processing for laser radar range images

Imaging laser radar can give intensity and range images, which provide integrated 3-dimensional (3D)information about objects. However, dropouts and range anomalies exacerbate range images, which makes their background cluttered and target blurred. For background suppression, a new algorithm that combines intensity image and its mean is presented. By using this algorithm to process actual laser radar range images, most background noises are suppressed. According to range anomalies characteristics, multitemplate selection order mean filtering algorithm is presented and used for actual ladar range images where the distance between two targets is 77 m. This algorithm obtains the clear range image in which the interval of two objects is 75 m. The result shows that the processing algorithm is correct and effective.