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Based on the Rayleigh-Sommerfeld diffraction integral and complex analytical signal representation,the free-space propagation equation and its Fourier spectrum for ultrashort chirped pulsed Gaussian beams are derived,and the far-field analytical electric field and spatial intensity are presented.

基于瑞利-索末菲衍射积分,使用复解析信号法推导出了啁啾脉冲高斯光束在自由空间中的传输方程及其傅里叶谱,给出了远场的光场和空间光强的解析式,研究了啁啾参数C对脉冲光束传输的影响。

And the critical power, which is mainly determined by the medium, is inverse proportion to n_2 of the medium.

光谱展宽量随光束直径的增加而减少,而且表现出与光束直径平方的倒数成正比的关系。

With the ever-increasing needs of high power diode laser source, it is important to obtain symmetric diode laser beam with high power so that a kind of beam-shaping technique with isosceles right-angled prism group has been used to achieve this aim.

随着半导体激光器应用的日益广泛,半导体激光的光束质量在二维方向极不均衡的特点限制了它的应用范围。采用一种等腰直角棱镜组的整形方法,可实现二维方向的光束质量均匀化。

This paper points out that laser beam quality's evaluating criterion is related to real application types.

详细地介绍了各种激光光束质量的评价标准,提出了光束质量的评价标准与实际的应用类型有关。

The results show that the laser energy is relatively concentrated while using Gaussian beam, but the lateral transport area is limited.

结果表明:与均匀光束比较,高斯光束辐照时,激光能量较为集中,但侧向传播范围较窄。

The method based on law of cosines of radiation. Used arrayed optical receivers to collect LASER energy. Because of the different between AOA and axes of optical receivers, the energy between each receiver was corresponding different.

该方法采用阵列光学头接收光能量,利用入射光束与不同光学通道夹角不同,接受的能量则不同的原理,通过对它们的比较来确定入射光束的角度。

Simulations are carried out upon square-aperture beam using Legendre polynomial. Conjugate gradient method is used and optimization is performed for several steps to reduce executing time.

针对方光束口径,利用 Legendre 多项式模拟光束波前分布,利用共轭梯度算法对多项式系数进行了优化计算;优化过程分为几步进行以减少计算时间。

In this work, the equations describing circular Gaussian beams propagating inside absorptive Keer medium have been derived from nonlinear paraxial equation. Based on the equations, an evolution equation of beam waist lias been obtained.

本文从非线性近轴波方程出发,导出了在吸收克尔介质中具有二次位相因子的圆对称高斯光束的传输方程,得到了光束束腰的演化方程。

This research is important in optical micromanipulation and beam shaping.

这一研究结果在研究涡旋光束的微粒操控和光束整形等方面具有重要意义。

The results indicate that for the same aperture Φ of the prism,Ahrens Nicol prism has the least beam translation,and Thompason inversed Nicol prism has the biggest beam translation.

结果表明:对于相同的棱镜孔径Φ,阿伦斯尼科耳棱镜产生的光束平移量最小,而汤普逊倒尼科耳棱镜产生的光束平移量最大。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。