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41.
42.
光腔模式及光束传输的特征向量算法 总被引:1,自引:0,他引:1
发展了一种新颖的适用于光腔模式及光束传输模拟计算的特征向量法.该方法的核心是基于菲涅耳-基尔霍夫衍射积分理论构造了一种新的光腔传输矩阵,通过求解激光谐振腔的本征积分方程,即可一次求解得到表征腔镜上多个光场模式振幅及相位分布的特征向量组;而谐振腔内或腔外任意地方的光场分布,也可采用该方法进行光束传输模拟而求得.对与该方法有关的单元划分、形函数选取、误差及稳定性分析等问题进行了论述,分析表明:合适的单元划分和形函数选取有利于提高计算速度、精度和稳定性. 相似文献
43.
Xe-Kr laser induced collisional ionization system and experimental preparation of its initial state: Four-photon resonant excitation 下载免费PDF全文
This paper proposes a novel one-colour Xe-Kr laser induced collisional ionization system. Considering the level scheme of the system, it finds that the initial state of the reaction--the four 4f levels with even J of Xe-can be prepared through method of four-photon resonant excitation by dye laser with wavelength of -440 nm. Absorption of an additional photon (the transfer laser) of the same wavelength will complete the laser induced collisional ionization process. The resonance enhanced ionization spectrum of Xe by four laser photons at -440nm is measured through time-of-flight mass spectrometry, this aims at the preparation of the initial state of the system proposed. The Stark broadening of the measured spectrum is observed and consistent with the previous study. Analysis of the measured resonance ionization spectrum implies the feasibility of -440 nm four-photon resonant excitation of the initial 4f state of the Xe Kr system proposed in this paper, which prepares for a further experiment of laser induced collisional ionization. 相似文献
44.
By considering the relative velocity distribution function and multipole expansion interaction Hamiltonian, a three-state model for calculating the cross section of laser-induced quadrupole-quadrupole collisional energy transfer is presented. Calculated results in Xe-Kr system show that in the present system, the laser-induced collision process occurs for ~4 ps, which is much shorter than the dipole-dipole laser-induced collisional energy transfer (LICET) process. The spectrum of laser-induced quadrupole-quadrupole collisional energy transfer in Xe-Kr system has wider tunable range in an order of magnitude than the dipole-dipole LICET spectra. The peak cross section decreases and moves to the quasi-static wing with increasing temperature and the full width at half peak of the profile becomes larger as the system temperature increases. 相似文献
45.
介绍了微机应用于静电导体、静电亚导体和静电绝缘体的静电泄漏规律研究的一种教学实验系统。同时通过实验结果的分析讨论,指出对目前大学物理教学实验“静电泄漏规律的研究”所作的改进及其实用价值。 相似文献
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48.
Characteristics of xenon-lamp pumped pyrromethene 567-doped dye laser based on polymethylmethacrylater 下载免费PDF全文
The solid-state medium containing pyrromethene 567 (PM567) in a polymethylmethacrylate polymer host is shown to lase under the flash lamp excitation. The experimental setup is an ordinary industrial product without special design. The bulk transmission losses, the output energy, and the other lasing properties are compared. The medium with the lowest transmission loss, measured to be 0.392 %/cm at 633 nm, gives a laser output of 130 mJ with a slope efficiency of 0.082%. 相似文献
49.
A modified U-tube conical bubble sonoluminescence device is used to
study the conical bubble photoluminescence. The spectra of conical
bubble sonoluminescence at different concentrations of rhodamine 6G
(Rh6G) solution in 1,2-propanediol have been measured. Results show
that the sonoluminescence from the conical bubbles can directly
excite Rh6G, which in turn can fluoresce. The light emission of this
kind is referred to as conical bubble photoluminescence. The maximum
of fluorescence spectral line intensity in the conical bubble
photoluminescence has a red shift in relative to that of the
standard photo-excited fluorescence, which is due to the higher
self-absorption of Rh6G, and the spectral line of conical bubble
photoluminescence is broadened in width compared with that of
photo-excited fluorescence. 相似文献
50.
工科物理课程建设与综合改革易丽莎,李天应,汤钧民,唐光荣,肖育英(华中理工大学物理系,武汉430074)工科物理课程(包括理论与实验两部分)是工科所有专业必修的重要基础课。由于物理学的基本原理和实验方法渗透到一切科学领域,因此物理课程的教学质量对科技... 相似文献