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激光辐照靶产生的等离子体电子密度的诊断对于惯性约束聚变、高能量密度物理等相关领域的研究具有重要意义,特别是高Z材料等离子体临界面附近的电子密度分布信息的测量.利用软X射线激光作为探针是诊断等离子体电子密度分布的一种重要方法,但在诊断激光辐照高Z材料产生的等离子体研究中,遇到了高Z材料等离子体自发辐射过大的问题,难以开展.为此,针对软X射线激光的特点,发展了多种具体的实验技术.通过综合利用这些技术,大大的抑制了待测等离子体自发辐射对信号的影响,使得软X射线激光探针诊断高Z材料等离子体成为可能.作为典型例子,实验诊断了激光辐照金平面靶的等离子体,获得了清晰的实验图像,表明相关的技术是有效和可行的. 相似文献
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激光辐照靶产生的等离子体电子密度的诊断对于惯性约束聚变、高能量密度物理等相关领域的研究具有重要意义,特别是高Z材料等离子体临界面附近的电子密度分布信息的测量. 利用软X射线激光作为探针是诊断等离子体电子密度分布的一种重要方法,但在诊断激光辐照高Z材料产生的等离子体研究中,遇到了高Z材料等离子体自发辐射过大的问题,难以开展. 为此,针对软X射线激光的特点,发展了多种具体的实验技术. 通过综合利用这些技术,大大的抑制了待测等离子体自发辐射对信号的影响,使得软X射线激光探针诊断高Z材料等离子体成为可能. 作为典型例子,实验诊断了激光辐照金平面靶的等离子体,获得了清晰的实验图像,表明相关的技术是有效和可行的.
关键词:
等离子体诊断
激光探针技术
软X射线激光
Z材料等离子体')" href="#">高Z材料等离子体 相似文献
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激光辐照靶产生的等离子体电子密度的诊断对于惯性约束聚变、等离子体物理、高能量密度物理等相关领域的研究具有重要意义,特别是中、高Z材料等离子体临界面附近的电子密度分布信息的测量.采用波长13.9 nm的类镍银软X射线激光作为探针,利用双频光栅剪切干涉技术尝试诊断了激光辐照金平面靶产生的等离子体的电子密度分布.实验获得了清晰的干涉条纹图像,通过对条纹的初步处理,测量到的最高密度达到了约1.4倍临界密度.通过与相关理论程序模拟结果对比,发现实验与模拟存在一定的偏差,为进一步优化模拟程序提供了有益的参考.通过实验,充分表明了软X射线激光双频光栅干涉技术在诊断中、高Z材料临界密度附近区域等离子体方面的实用性. 相似文献
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惯性约束聚变一直对临界面附近的稠密等离子体电子密度信息非常感兴趣。利用X射线激光为探针的干涉诊断是目前直接获得稠密等离子体电子密度信息的最好方法。等光程、条纹定域、条纹密度的调节是干涉仪装调需要解决的主要问题。2003年秋,建立了马赫一贞德尔干涉仪在靶室外调节、靶室内的安装以及模拟光干涉条纹的监测系统,很好的解决了以上3方面的问题。 相似文献
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Lithographical laser ablation using femtosecond laser 总被引:1,自引:0,他引:1
Y. Nakata T. Okada M. Maeda 《Applied Physics A: Materials Science & Processing》2004,79(4-6):1481-1483
Lithographical laser ablation was demonstrated using a femtosecond laser with a lithographical optical system. In this method, a femtosecond laser beam passes through a mask and the pattern is imaged on a film by a coherent optical system. As a result, the film is lithographically ablated, and a micron-sized pattern can be generated in a single shot. The resolution of generation was 13 m, and the narrowest width of a generated line was about 4 m. Moreover, the system was applied to transmission gratings as masks, and nano-sized periodic structures such as nano-sized hole matrices and nano-meshes were generated in a single shot. PACS 52.38.Mf; 42.25.Hz; 42.82.Cr; 81.16.-c 相似文献
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I. G. Koprinkov K. V. Stamenov K. A. Stankov 《Applied physics. B, Lasers and optics》1984,33(4):235-238
An intensive generation of radiation from a discharge-pumped atomic-fluorine gas laser is reported. A peak power exceeding 330 kW and a total energy of more than 2 mJ is obtained for a number of lines in the red, using a NF3He (1100) gas mixture at total pressure of 500 Torr. The circuitry optimization is described and the conditions for effective operation of the atomic-fluorine laser are discussed. The temporal and the spectral characteristics of the laser emission are also presented. 相似文献
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Hua-Bei Jiang 《Applied physics. B, Lasers and optics》1991,53(5-6):347-349
We propose a scheme for building a free-electron laser in the soft X-ray region pumped by the soliton laser. Making use of soliton laser wave evolution shape and single-pass small signal analysis, we find that this laser has two special advantages over the previous electromagnetic wave undulator free-electron lasers. One is a very small mass-shift effect because of the special characteristics of soliton laser; the other is that it has an additional frequency tuning effect based on the conventional free-electron laser's tunability. We also obtain the small signal gain and present some discussion. 相似文献
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A double-pulsed neutral copper vapor laser, based on a Cu/CuCl discharge, was placed in tandem with a ZnCl2 discharge cell in a common optical cavity. The ZnCl2 in the separately heated discharge tube acted as a source of Cl-based plasma by- products which are also likely constituents of the Cu/CuCl laser plasma. The timing of the two discharges was varied relative to one another and the Cu laser emission at λ = 510 nm was monitored to test the optical absorption losses in the combined cavity in relation to time. The experiments provide some insight into the chemical effects in the laser plasma that may limit the energy output of a Cu/CuCl laser. 相似文献
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Development is reported of a UV-preionized electric-discharge XeCI laser with emission energy 0.8 J ( = 308 nm). The energy and temporal characteristics of the laser are investigated, and the optimum gas-mixture composition for He as the buffer gas is determined. Ways of further increasing the XeCl-laser energy are indicated on the basis of the results.Translated from Lazernye Sistemy, pp. 87–91, 1982. 相似文献
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为了满足超远程和高速空间激光通信的需求,设计了一种以1.06 m光纤激光4支路相控阵作为发射源的通信系统结构。采用53 Mb/s、120 Mb/s、155 Mb/s速率调制的伪随机序列,实验了相控阵种子源和一条支路处调制的2种方案。结果表明:相同速率下,种子源调制的接收眼图质量较好,通过相位控制,可以进一步提高接收质量。实验中,研究了2条支路光分别调制的相控阵多载波特性,调制信号采用5/5.08 MHz及20/40 MHz两组正弦波,经光束合成和相位控制,在接收端观测到相应的频域信号。实验初步验证了光纤激光相控阵空间通信系统的可行性。 相似文献
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Benware BR Ozols A Rocca JJ Artioukov IA Kondratenko VV Vinogradov AV 《Optics letters》1999,24(23):1714-1716
We focused the beam of a high-repetition-rate capillary-discharge tabletop laser operating at a wavelength of 46.9 nm, using a spherical Si/Sc multilayer mirror. The energy densities significantly exceeded the thresholds for the ablation of metals. Single-shot laser ablation patterns were used in combination with ray-tracing computations to characterize the focused beam. The radiation intensity within the 2-mum -diameter central region of the focal spot was estimated to be approximately 10(11)W/cm(2), with a corresponding energy density of ~100 J/cm(2). 相似文献
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Short FIR laser pulses of high repetition rate are obtained by pumping NH3 with the pulses of a passively Q-switched IR laser. The two cascade laser transitions observed show coupled relaxation oscillations. The pulse shapes and delay times are qualitatively in agreement with a four-level rate-equation model.Partially supported by Deutsche ForschungsgemeinschaftOn leave from Korea Standards Research Institute, Dae Deog Dan Ji, P.O. Box 3, Choong Nam, Korea, supported by Korea Science and Engineering Foundation 相似文献
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The operation of an eightfold longitudinally diode laser pumped 1.06m cw Nd:YAG slab laser is demonstrated. The 809 nm diode radiation is focused through a dichroic coating into each laser channel starting from the reflection points of the 1.06m beam in the slab crystal. At an absorbed pump power in the crystal of 2830 mW a maximum cw TEM00 output of 1075 mW was achieved with a corresponding slope efficiency of 42.5%. 相似文献
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The photophysical properties such as singlet absorption and fluorescence spectra, the fluorescence quantum yield and fluorescence decay time as well as the laser performance data such as the tuning range, the conversion efficiency, and the photochemical stability of 12 sterically hinderedp-quaterphenyls have been measured in ethanol and/or dioxane at room temperature. The sterically hinderedp-quaterphenyls exhibit shorter laser dye emissions in the 330–380 nm range than the parent compoundp-quaterphenyl. The conversion efficiencies of the sterically hinderedp-quaterphenyls range between 1 and 21%. The photochemical stability of the sterically hinderedp-quaterphenyls is by a factor of 10 to 20 better in dioxane than in ethanol. 2-Methyl-5-tert. butyl-p-quaterphenyl and 2,5,2,5-tetramethyl-p-quaterphenyl are among the most stable UV laser dyes known today. 相似文献