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光学精密工程2014年第22卷第11期 目录
【出 处】
：
光学精密工程
【发表日期】
：
2014年22期
其他文献
为研究激光选区熔化(SLM)工艺成形CX马氏体时效不锈钢时的成形质量与力学性能,基于单熔道实验确定了CX马氏体时效不锈钢SLM成形的工艺窗口。在此基础上,分析了离焦量对SLM成形CX马氏体时效不锈钢试样致密度、硬度和表面粗糙度的影响规律。结合拉伸实验和微观组织观察,研究了热处理前后试样力学性能的变化规律。结果表明:在低离焦量时,激光能量密度过高,熔池不稳定性增加,球化现象明显,试样致密度和硬度降低,表面粗糙度升高,拉伸断口呈准解理断裂特征;随离焦量增大,适宜的能量密度和光斑尺寸有利于相邻熔道间和层间形成良
The approximative formula for the far-field diffraction of a Gaussian beam through a circular aperture is obtained by using the superposition of Gaussian beams instead of the aperture function, and the explicit expression for calculating the beam divergen
In this paper, we demonstrate a scheme to tailor both longitudinal and transverse modes inside a laser cavity and constitute an eye-safe single longitudinal mode
期刊
相对论大电流电子束（REB)作为一种能在短时间内集中获得大能量的新的束源，正在引起极大的注意。1934年Bennet曾对以电子束自身聚束为中心进行过探讨，而后Alfven(1939)在与宇宙射线传播有关的问题上得出了有限传输的Alfven电流，所以说，在理论上，很早以前对REB就进行了研究。但是，尽管如此，实际上直到1960年才研制出这样的电子束，从此，这一领域的研究工作才得到飞跃的发展。REB技术是英国的AWEE (原子武器研究中心)首次研究成功，之后以美国和苏联为中心开展了大规模的研究，如今能够得到每
期刊
Supersonic flows with high Mach number are ubiquitous in astrophysics. High-powered lasers also have the ability to drive high Mach number, radiating shock waves in laboratory plasmas, and recent experiments along these lines have made it possible to recr
Effect of polarization spectroscopy in multitep excitation and ionization of atoms on ionization eff
本文导出了直角刻槽反射光栅在正入射和非正入射以及刻槽偏离直角等情况下,反射夫朗和费(Fraunhofer)衍射强度分布表达式;用数值计算结果,分析和讨论了这种光栅的后向衍射特性.
In order to solve the difficulty of testing large mirror, the sub-aperture stitching interferometry (SSI) is proposed and expatiated. The basic theory and principle of this method are introduced and analyzed. A reasonable stitching algorithm and mathemati
A new spectroscopic method is proposed for the characterization of optical zero-order retarders. It is demonstrated that the retardance as well as the variation of the effective fast axis of a bi-plate zero-order quarter retarder (633 nm) can be obtained