共查询到20条相似文献,搜索用时 78 毫秒
1.
本文针对激光束准直系统中的离焦量对准直倍率的影响进行详细的讨论,给出了准直系统的最佳设计公式,同时提出一种新的准直光源系统的设计构想。 相似文献
2.
基于单平板的两种旋转特性(绕表面中心法及绕入射光束光轴旋转)作者提出了一种任意剪切方向的全方位剪切干涉仪,这不仅对于旋转对称发光,尤其对于非旋转对称激光束的定量检测具有十分重要的应用价值,文中描述了该仪器原理,参数及应用实例。 相似文献
3.
本文用麦克斯韦方程组分析了高斯光波的偏振特性。结果表明,场矢量除了含有主偏振分量和纵向偏振分量以外,还存在一个非零的正交偏振分量,并提出了一种基于激光束偏振特性的准直测量方法。 相似文献
4.
LD激光束准直整形模块的研制 总被引:1,自引:0,他引:1
SDL-5400型号GaAlAs LD激光器产生的是单模高斯光束,在相互垂直方向上光束发散角不相等,且存在像散。为得到共腰的圆形光斑,由复参数q和ABCD定律,设计出两相互垂直的柱面透镜和棱镜对准直整形模块,通过CCD标定方法,得到经准直整形后的LD激光束在弧矢方向上的远场发散角为0.53mrad,子午方向为0.64mrad。 相似文献
5.
介绍了一种新型自适应双频激光准直系统,该系统利用两个完全对称的渥拉斯顿棱镜,五个作为测量元件,另一个作为补偿元件。对测量信号的处理,采用比相技术,测量元件可以暂时移出光路,因而能够进行同轴度的测量。两束干涉光基符合共光路原则,适应于长距离的准直测量。 相似文献
6.
离轴抛物镜准直特性的研究 总被引:2,自引:3,他引:2
由于反射式离轴抛物镜不产生色差并具有较大的有效孔径,已经广泛应用于辐射校准、宽波段的目标模拟和能量聚焦工作中。影响离轴抛物镜准直特性的主要因素有离轴量,有效孔径和焦面出射点的位置。采用矢量的方法,分析了离轴量等参量和准直性能之间的关系。给出了焦面出射点的位置从0~0.05f,相对孔径D/f从0~0.40,相对离轴量h/f从0.1~0.5变化时,离轴抛物镜准直仪的准直性能曲线。运用CODE V对矢量法的分析结果进行了验证,在条件一致的情形,两者结果吻合。这些结果有助于准直仪的设计。 相似文献
7.
上海软X射线自由电子激光装置(SXFEL)对束流发射度增长的幅度有着较为严格的限制,传统的光学准直已经不能满足其要求。采用基于束流的准直方法可以实现更为精密的准直,使得直线加速器的准直误差进一步降低,以满足自由电子激光装置的要求。通过对不同条件下束流位置检测器(BPM)测得的数据采用最小二乘法算法进行计算分析,可以计算得到四极磁铁和BPM的准直误差,进而进行束流准直和轨道校正。基于以上原理,计算了各种元件误差对轨道和发射度造成的影响,同时基于Matlab平台设计了控制软件,模拟结果表明轨道偏离量可减少一个数量级。 相似文献
8.
上海软X射线自由电子激光装置(SXFEL)对束流发射度增长的幅度有着较为严格的限制,传统的光学准直已经不能满足其要求。采用基于束流的准直方法可以实现更为精密的准直,使得直线加速器的准直误差进一步降低,以满足自由电子激光装置的要求。通过对不同条件下束流位置检测器(BPM)测得的数据采用最小二乘法算法进行计算分析,可以计算得到四极磁铁和BPM的准直误差,进而进行束流准直和轨道校正。基于以上原理,计算了各种元件误差对轨道和发射度造成的影响,同时基于Matlab平台设计了控制软件,模拟结果表明轨道偏离量可减少一个数量级。 相似文献
9.
Chen Zhifei Yao Ke Fan Chen Tang Jun Lü Mengjie Lu Zhenhua Gao Song Xie Xudong Fu Xuejun Fan Mengqiu Zheng Kuixing Chen Bo Peng Zhitao Feng Bin 《强激光与粒子束》2021,33(9):091004-1-091004-6
展示了基于离轴八程激光放大器的闭环自动准直技术研究,该项技术旨在用自动准直系统取代手动光路准直的方式,明显提高了该构型复杂的多程激光放大器的运行效率、准直精度与其输出光束质量。该技术利用主激光照明和像传递系统实现离轴八程激光放大器中滤波器小孔空间位置的精确标定,通过边缘检测处理远场光斑得到其指向中心。基于光斑中心与基准间的差值,对特定反射镜架进行二维控制进行光束指向补正,从而实现离轴八程放大器系统的闭环自动准直。研究结果表明,实验结果契合离轴八程放大器系统对光束准直准确率与效率的要求,验证了该准直技术在离轴八程激光放大光路中应用的可行性。 相似文献
10.
《低温与超导》2015,(4)
Cry Module由于其无法通视和超低温特性,是超导直线加速器准直中的重点与难点。文中提出由激光跟踪仪和测微准直望远镜协同准直冷质量组件。作者设计了测微准直望远镜所用十字丝目标及其支架,而且成功安装低温超导组件,监测了两次低温实验时的位移。常温安装精度达到0.15mm,低温监测精度达到0.5mmm。目前ADS-Cry Module已通过中期检查验收,成功引出能量2.68Me V、最大流强3.6m A的连续波质子束,束流功率达到9.6k W,是目前国际上连续束运行的超导质子直线加速器中束流功率最高的,也是我国首次实现超导高频腔加速毫安级连续波质子束。这标志着我国强流质子超导直线加速器技术进入国际先进行列。 相似文献
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B. Smeets R. W. Herfst L. P. Maguire E. te Sligte P. van der Straten H. C. W. Beijerinck K. A. H. van Leeuwen 《Applied physics. B, Lasers and optics》2005,80(7):833-839
We report results of the first laser collimation of a thermal beam of Fe atoms on the leaky 5D4 5F5 transition, with both parallel linear xx and crossed linear xy laser polarization configurations. The measured atomic beam divergence is compared to a rate-equation model and a quantum Monte Carlo model. The experimental values for the divergence are limited by the finite laser line width, which is comparable to the natural line width of the Fe atom. In general, flux decreases with higher intensities, showing the effect of the leaky transition. At the best beam collimation RMS = 0.17 mrad, which is for a detuning of = – and a saturation parameter of s = 6, the flux decreased to approximately 70%. Highest flux was measured for a detuning of = –2 and s = 4, reaching 135% of the uncooled value. From our measurements we estimate the total leak rate to be 1/(240 ± 40), which is in good agreement with the literature value of 1/244. The crossed linear polarization configuration is the better choice, with a slightly better collimation but the same atomic beam flux. Plugging of the largest leak would increase the flux to at least 80% of the closed transition value, resulting in better contrast for atom lithography. 相似文献
13.
《Physics letters. [Part B]》2011,703(5):547-551
New experiments on crystal assisted collimation have been carried out at the CERN SPS with stored beams of 120 GeV/c protons and Pb ions. Bent silicon crystals of 2 mm long with about 170 μrad bend angle and a small residual torsion were used as primary collimators. In channeling conditions, the beam loss rate induced by inelastic interactions of particles with the crystal nuclei is minimal. The loss reduction was about 6 for protons and about 3 for Pb ions. Lower reduction value for Pb ions can be explained by their considerably larger ionization losses in the crystal. In one of the crystals, the measured fraction of the Pb ion beam halo deflected in channeling conditions was 74%, a value very close to that for protons. The intensity of the off-momentum halo leaking out from the collimation station was measured in the first high dispersion area downstream. The particle population in the shadow of the secondary collimator-absorber was considerably smaller in channeling conditions than for amorphous orientations of the crystal. The corresponding reduction was in the range of 2-5 for both protons and Pb ions. 相似文献
14.
扩束准直光学系统中光学元件失调对高斯光束传输变换的影响分析 总被引:1,自引:1,他引:1
基于广义惠更斯-菲涅尔衍射积分公式, 以高斯光束为激光束模型,推导了激光光束通过失调扩束准直光学系统的传输公式,分析了光学元件失调对扩束准直光学系统输出光束传输特性的影响,并在此基础上进行了仿真。实验结果表明,高斯光束通过失调扩束准直光学系统时,出射光束变为偏心高斯光束,光学元件失调程度越大,输出光束越偏离光轴,光束质量越差。在同样的失调下,长焦距光学元件对输出光束影响更大,因此在激光扩束准直光学系统中,调整长焦距光学元件更为重要。 相似文献
15.
Y. Z. Wang L. Liu X. Z. Chen X. J. Wang S. W. Fang W. Q. Cai S. Y. Zhou Y. S. Liu 《Applied physics. B, Lasers and optics》1994,58(4):327-331
This paper reports an experimental study on the collimation and decollimation of an atomic beam in a misaligned standing wave, in which the effective detuning caused by the Doppler effect is affected by the longitudinal velocity of the atomic beam. The experiment shows that in a strong field with red detuning between laser field and atomic transition frequency, laser heating in a normal standing wave becomes laser cooling in a misaligned standing wave for an approriate misalignment angle. For blue detuning, laser cooling in a standing wave can also become laser heating in a misaligned standing wave for an appropriate condition. These results ca be used in controling atomic motion. 相似文献
16.
Beam shaping and homogenization techniques are essential to optimize a large number of laser-material processing applications and laser-material interaction studies. In this paper, we present an innovative approach for modeling laser beam homogenization by means of the integration method. The numerical results are compared with experimental data, and the influence of the measurement technique is discussed. The enhancement of the homogenization capability using an asymmetric divider is also presented and discussed. 相似文献
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Irina Koshelev Rong Huang Timothy Graber Mati Meron J. Lewis Muir William Lavender Kevin Battaile Anne M. Mulichak Lisa J. Keefe 《Journal of synchrotron radiation》2009,16(5):647-657
The IMCA‐CAT bending‐magnet beamline was upgraded with a collimating mirror in order to achieve the energy resolution required to conduct high‐quality multi‐ and single‐wavelength anomalous diffraction (MAD/SAD) experiments without sacrificing beamline flux throughput. Following the upgrade, the bending‐magnet beamline achieves a flux of 8 × 1011 photons s?1 at 1 Å wavelength, at a beamline aperture of 1.5 mrad (horizontal) × 86 µrad (vertical), with energy resolution (limited mostly by the intrinsic resolution of the monochromator optics) δE/E = 1.5 × 10?4 (at 10 kV). The beamline operates in a dynamic range of 7.5–17.5 keV and delivers to the sample focused beam of size (FWHM) 240 µm (horizontally) × 160 µm (vertically). The performance of the 17‐BM beamline optics and its deviation from ideally shaped optics is evaluated in the context of the requirements imposed by the needs of protein crystallography experiments. An assessment of flux losses is given in relation to the (geometric) properties of major beamline components. 相似文献
19.
A. A. Zemlyanov Y. E. Geints 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,42(2):349-357
The generic scenario of intense femtosecond laser pulse propagation in the
air from the viewpoint of evolution of its integral effective parameters
(energy transfer coefficient, effective radius, effective duration, limiting
angular divergence) is considered. The analysis of variation of the
effective parameters along the propagation path in the single and multiply
filamentation scenarios based on numerical calculations is presented. It is
shown that the process of self-action of the ultrashort radiation is
characterized by the formation in a medium of the nonlinearity layer, after
which optical pulse propagates quasi-linearly with the limiting angular
divergence that depends mainly on initial pulse power. The effective pulse
temporal duration and the effective beam radius increase after the passage
through the nonlinearity layer, and their values are mostly determined by
the initial beam power also. The coefficient of energy transmission of
femtosecond laser radiation is lower than in the linear medium and has a
tendency to decrease with the increase of the pulse power. 相似文献
20.
报道激光二极管泵浦的掺钕氟磷酸钙固体激光器,该器件在重复频率为100Hz的准连续状态下运行,当耦合输出透过率为8%时,得到31%的斜效率,比较了FAP和YAG这两种介质的激光器的性能,理论分析得出的两者的阈值泵浦功率的相对值与实验结果相一致,并证实FAP是一种有前途的适合激光二极管泵浦的激光介质。 相似文献