近代光学物理最重要的成就之一是1966年由Sorokin和Lankard以及ScMfer等各自独立发明的染料激光器。有机染料激光器的出现,提供了一种波长跨越很宽范围连续可调的相干辐射源。在某些实验,如多光子吸收和非线性光学实验中,往往同时需要两个或两个以上能独立调节的髙功率脉冲激光波长。然而,由于激光脉冲的典型宽度为5 ns,因此,任何一个的频率抖动都将使两个独立的激光器难以同步。如果用单泵激励双波长染料激光器就可保证输出在时间上的一致性,从而避免了上述困难。迄今已发展了若干不同类型的双波长染料激光器。1
We study an electronic compensator (EC) as a receiver for a 100-Gb/s polarization division multiplexing coherent optical orthogonal frequency division multiplexing (PDM-CO-OFDM) system without optical dispersion compensation. EC, including electrical disp
本文报道了AgGaS2晶体Ⅱ类非共线相位匹配Q开关Nd:YAG激光泵浦CO2激光参量上转换研究结果,用迭代法计算了相位失配因子ΔK=0时的最佳非共线夹角.当泵浦功率密度为6MW/cm2和晶体长度为4.7mm时,功率转换效率达16.1%,并且首次采用硅雪崩光电二极管接收和频信号.
工作在超辐射模式下的集体区自由电子激光器的增益特性研究可以通过改变互作用区长度及泵浦强度来进行。我们利用偏转磁场可以获得任意的相互作用区长度。实验结果证明,工作在集体区的自由电子激光的辐射增益随泵浦磁场近似呈1.7次方关系,实验测得的增益系数范围为0.4dB/cm到1.38dB/cm。
多参数联合优化是光刻分辨率增强技术的发展方向。提出了一种以光刻胶三维形貌差异为评价目标的光刻多参数联合优化方法。以多个深度位置的光刻胶图形误差为目标函数,对光源、掩模、投影物镜波前、离焦量和曝光剂量进行联合优化,提高了光刻胶图形三维形貌的质量。为获得较高的优化效率,采用自适应差分进化算法实现光源和掩模的优化,并针对其他参数的特点,采用不同优化方法进行优化。对密集线、含有交叉门的复杂掩模图形和静态随机存储器中的典型图形进行了仿真验证,可用焦深的最大值分别达到237 nm、115 nm 和144.8 nm,曝
A novel four light ray path test method for measuring residual reflectance has been presented. Residual reflectance spatial distribution at a cladding interface was measured using the technique. Residual reflectance could be on the order of 10
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本文报道了一种分析望远镜热稳定腔的新方法——组合透镜法。运用这种方法,成功地实现了Nd:YAG脉冲激光器的稳定而大体积TEM_(00)模运转,在1~10pps重复率范围内,振荡级的单脉冲输出能量达250mJ,输出能量起伏小于±2%。
An approach, based on the correlation between the intensity distribution of object wave of the directly recorded by charge-coupled device and the one reconstructed by computer, is proposed to evaluate the quality of the phase reconstruction in light emitt
Phase diversity (PD) is a kind of wavefront sensing technology based on image collecting and post-processing. We apply the PD technology to align an off-axis three-mirror reflecting anastigmatic system precisely. It can be concluded that the wavefront err