全文获取类型
收费全文 | 39篇 |
免费 | 72篇 |
国内免费 | 6篇 |
专业分类
晶体学 | 5篇 |
物理学 | 112篇 |
出版年
2024年 | 1篇 |
2022年 | 3篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 5篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2014年 | 2篇 |
2013年 | 2篇 |
2011年 | 5篇 |
2010年 | 6篇 |
2009年 | 11篇 |
2008年 | 7篇 |
2007年 | 4篇 |
2006年 | 8篇 |
2005年 | 9篇 |
2004年 | 9篇 |
2003年 | 9篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1985年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 3篇 |
1980年 | 1篇 |
排序方式: 共有117条查询结果,搜索用时 171 毫秒
1.
A picosecond widely tunable deep-ultraviolet laser for angle-resolved photoemission spectroscopy 下载免费PDF全文
We develop a picosecond widely tunable laser in a deep-ultraviolet region from 175 nm to 210 nm,generated by two stages of frequency doubling of a 80-MHz mode-locked picosecond Ti:sapphire laser.A β-BaB2O4 walk-off compensation configuration and a KBe2BO3F2 prism-coupled device are adopted for the generation of second harmonic and fourth harmonics,respectively.The highest power is 3.72 mW at 193 nm,and the fluctuation at 2.85 mW in 130 min is less than ±2%. 相似文献
2.
3.
This paper investigates the scattering effect of
domestic 0.5 at{\%} ceramic Nd:YAG. An effective method has been
utilized to measure the scattering and absorption coefficients.
An end-pumped continuous wave (CW) Nd:YAG ceramic laser was also
demonstrated. A maximum output power of 6.7~W at 1064~nm was
obtained at an 808-nm pump power of 32.9~W. Conversion efficiency
and slope efficiency have been achieved. This indicates that
scattering has an important effect on the optical performance of
ceramic Nd:YAG. 相似文献
4.
Disappearance of Superconductivity and a Concomitant Lifshitz Transition in Heavily Overdoped Bi_2Sr_2CuO_6 Superconductor Revealed by Angle-Resolved Photoemission Spectroscopy 下载免费PDF全文
丁颖 赵林 闫宏涛 高强 刘静 胡成 黄建伟 李聪 徐煜 蔡永青 戎洪涛 吴定松 宋春尧 周花雪 董晓莉 刘国东 王庆艳 张申金 王志敏 张丰丰 杨峰 彭钦军 许祖彦 陈创天 周兴江 《中国物理快报》2019,(1)
By partially doping Pb to effectively suppress the superstructure in single-layered cuprate Bi_2Sr_2CuO_(6+δ)(Pb-Bi2201) and annealing them in vacuum or in high pressure oxygen atmosphere, a series of high quality Pb-Bi2201 single crystals are obtained with T_c covering from 17 K to non-superconducting in the overdoped region. High resolution angle resolved photoemission spectroscopy measurements are carried out on these samples to investigate the evolution of the Fermi surface topology with doping in the normal state. Clear and complete Fermi surfaces are observed and quantitatively analyzed in all of these overdoped Pb-Bi2201 samples. A Lifshitz transition from holelike Fermi surface to electron-like Fermi surface with increasing doping is observed at a doping level of ~0.35. This transition coincides with the change that the sample undergoes superconducting-to-non-superconducting states.Our results reveal the emergence of an electron-like Fermi surface and the existence of a Lifshitz transition in heavily overdoped Bi2201 samples. This provides important information in understanding the connection between the disappearance of superconductivity and the Lifshitz transition in the overdoped region. 相似文献
5.
The 10 kW Level High Brightness Face-Pumped Slab Nd:YAG Amplifier with a Hybrid Cooling System 下载免费PDF全文
We demonstrate a high power, high brightness, slab amplifier based on face-pumped Nd:YAG slab gain modules,having a high efficient hybrid cooling system of the conduction cooling and forced convection cooling. Using a single gain module, a laser output power up to 4.5 kW with a remarkable optical-optical conversion efficiency of 51% is realized, indicating an excellent lasing performance of the Nd:YAG slab module. The amplifier operates at a repetition rate of 700 Hz and delivers a maximum average output power exceeding 10.5 kW with pulse duration of 150us. A good beam quality factor is measured to be β = 1.9. To the best of our knowledge, this is the highest brightness for a 10 kW level Nd:YAG slab amplifier. 相似文献
6.
Common Features in Electronic Structure of the Oxypnictide Superconductors from Photoemission Spectroscopy 下载免费PDF全文
贾小文 ;刘海云 ;张文涛 ;赵林 ;孟建桥 ;刘国东 ;董晓莉 ;吴刚 ;刘荣华 ;陈仙辉 ;任治安 ;衣纬 ;车广灿 ;陈根富 ;王楠林 ;王桂玲 ;周永 ;朱镛 ;王晓阳 ;赵忠贤 ;许祖彦 ;陈创天 ;周兴江 《中国物理快报》2008,25(10):3765-3768
High resolution photoemission measurements are carried out on non-superconducting LaFeAsO parent com- pound and various superconducting RFeAs(O1-ZFx) (R=La, Ce and Pr) compounds. It is found that the parent LaFeAsO compound shows a metallic character. By extensive measurements, several common features are identified in the electronic structure of these Fe-based compounds: (1) 0.2 eV feature in the valence band, (2) a universal 13-16 meV feature, (3) near EF spectral weight suppression with decreasing temperature. These uni- versal features can provide important information about band structure, superconducting gap and pseudogap in these Fe-based materials. 相似文献
7.
Detailed electronic structure of three-dimensional Fermi surface and its sensitivity to charge density wave transition in ZrTe_3 revealed by high resolution laser-based angle-resolved photoemission spectroscopy 下载免费PDF全文
The detailed information of the electronic structure is the key to understanding the nature of charge density wave(CDW) order and its relationship with superconducting order in the microscopic level. In this paper, we present a high resolution laser-based angle-resolved photoemission spectroscopy(ARPES) study on the three-dimensional(3 D) hole-like Fermi surface around the Brillouin zone center in a prototypical quasi-one-dimensional CDW and superconducting system ZrTe_3. Double Fermi surface sheets are clearly resolved for the 3 D hole-like Fermi surface around the zone center. The3 D Fermi surface shows a pronounced shrinking with increasing temperature. In particular, the quasiparticle scattering rate along the 3 D Fermi surface experiences an anomaly near the charge density wave transition temperature of ZrTe_3(~ 63 K). The signature of electron–phonon coupling is observed with a dispersion kink at ~ 20 me V; the strength of the electron–phonon coupling around the 3 D Fermi surface is rather weak. These results indicate that the 3 D Fermi surface is also closely connected to the charge-density-wave transition and suggest a more global impact on the entire electronic structure induced by the CDW phase transition in ZrTe_3. 相似文献
8.
9.
We report the dark blue nonlinearˇCerenkov radiation by the second harmonic generation(SHG)in a two-layer-stacked hexagonal periodically-poled-MgO:LiNbO3s(PPMgOLNs).Based on the direct wafer bonding of two target PPMgOLNs rotating around the axis perpendicular to the plane with an angle of 30°,twelve bright spots as twice of those in a single PPMgOLN are shown at each second-harmonicˇCerenkov ring.The experimental results agree with the theoretical ones and present a promising application in the fabrication of three-dimensional(3D)PPMgOLNs. 相似文献
10.
High Beam Quality Green Generation with Output 140W Based on a Thermally-Near-Unstable Flat-Flat Resonator 总被引:1,自引:0,他引:1 下载免费PDF全文
By using a diode-side-pumped Q-switched Nd:YAG rod laser based on a thermally-near-unstable fiat-fiat resonator, an intracavity-frequency-doubled green beam generation is investigated. Output power 140 W is obtained at a repetition rate of 10kHz and a pulse width of 110ns. The green beam quality factors Mx^2 and My^2, which are measured by a laser beam analyser, are 10.65 and 10.85, respectively, at output power of 124W. 相似文献