共查询到20条相似文献,搜索用时 15 毫秒
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P. Allenspach J. Mesot U. Staub M. Guillaume A. Furrer S. -I. Yoo M. J. Kramer R. W. McCallum H. Maletta H. Blank H. Mutka R. Osborn M. Arai Z. Bowden A. D. Taylor 《Zeitschrift für Physik B Condensed Matter》1994,95(3):301-310
Neutron diffraction, neutron spectroscopy and magnetization measurements have been employed to study the structural, electronic, and magnetic behavior of eleven compounds with the general formula Nd1+y
Ca
v
Ba2–y–v
Cu3O
x
(0y0.5; 0v0.25; 6x7). The structure turned out to react to oxygen reduction similar as other 123-compounds, yielding discontinuities close to the metal-insulator-transition and the well-known relations of bond lengths as a function ofT
c. The crystalline electric field (CEF) interaction, splitting the 10-fold degenerate ground-state J-multiplet of the Nd3+-ions into five doublet states, was investigated by neutron spectroscopy. The derived CEF parameters have been used to determine changes in the electronic surroundings of the Nd3+ ions. In addition, with the help of the CEF parameters the thermodynamic magnetic properties of these compounds were calculated which turn out to be in good agreement with the experimental data. 相似文献
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闪光灯抽运的Nd:KGW和Nd:YAG激光器的性能比较 总被引:1,自引:0,他引:1
用重复频率1Hz、脉冲宽度120μs的闪光灯仙面抽运,在相同的实验条件下,对比了Nd:KGW晶体与Nd:YAG晶体的激光性能。在自由运转时,分别获得1.0%和0.44%的斜率效率和0.54J、0.76J的外推阈值能量,获得的最大输出能量为384mJ和165mJ。调Q运转时,Nd:KGW激光器与Nd:YAG激光器的斜率效率分别是0.16%和0.07%,阈值能量为5.9J与12.5J。 相似文献
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《光学学报》2017,(6)
在大功率端面抽运固体激光器中,传统Nd…YAG晶体吸收谱线较窄,极易受到抽运源因温度发生波长漂移的影响,导致激光器输出功率出现起伏变化。为了降低激光器对抽运源温度波长漂移的敏感程度,将具有优良热物性参数的Nd…YAG晶体和具有宽吸收谱特性的Nd…YVO_4晶体相结合,通过前后组合放置的方式,由前端Nd…YAG晶体吸收大部分抽运光能量,用后端Nd…YVO_4晶体对未被吸收的抽运光能量进行补充吸收。当抽运源出现波长漂移时,两种晶体通过互补吸收的方式,使激光器吸收效率和输出功率保持稳定,从而降低抽运源温度波长漂移对激光器产生的影响。实验表明,在抽运功率97.5 W时,这种双晶体组合方案可在抽运源工作温度为22~32℃内,实现对抽运光大于90%的吸收效率,同时激光器输出功率不稳定度小于8%,有效改善了激光器对抽运源温度波长漂移的敏感程度。 相似文献
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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
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CAMAS系统公司提供MLD7000——稳定锁模二极管泵浦固体Nd:YAG激光器系统。据说,以100MHz脉冲速率和20—500ps的脉冲宽度,可产生100mW的输出功率。在原系统的基础上,可获得Nd:YLF和较高重复率的改型系统。这种紧凑系统可完全得到控制,并能用电子学方法使其稳定。 相似文献
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长期以来Nd:YAG激光器都是用闪光灯泵浦的。由于闪光灯的使用寿命有限,空间激光界的人们转而研制二极管泵浦激光器。最先泵浦用的激光二极管是GaAlAs双异质结激光二极管,它能在最佳泵浦波长808nm处连续工作。目前可用的激光二极管的泵浦效率可达20%或更高。根据速率方程,我们分析了Nd:YAG材料的能量转换过程。增益系数主要依赖于泵浦的通量密度和波长,而功率转换效率主要依赖于通过介质的1.06μm激光的通量密 相似文献
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LU Jiang HUANG Zhaoming JIN Zhenhong WANG Yangjun ZHOU Fuzheng ZHANG Xiurong WU Guangzhao SHENG Liqing 《Chinese Journal of Lasers》1994,3(1):5-9
Diode-PumpedMonolithicNd:LMALaser¥LUJiang;HUANGZhaoming;JINZhenhong;WANGYangjun(OpticalFiberInstitute,,ShanghaiUniversityofSc... 相似文献
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Repetition-rate Tube-shaped Nd∶YAG Laser 总被引:1,自引:0,他引:1
1IntroductionIntheseyears,solidstatelaserdevelopsrapidly.There’remanytypesofsolidstatelasers,butNd∶YAGlaserisstiloneofthemo... 相似文献
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Self-Q-switched diode-end-pumped Nd:BGO laser¥HUWentao;ZHOUFuzheng;FANDianyuan;JIANGZhonghong(ShanghaiinstitufeofOpticsandFin... 相似文献
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1 Introduction Inrecentyears,researchershavepaidmuchattentiontoselffrequencydoublingmultifunctionalcrystalforobtainingdirectl... 相似文献
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报导了新型激光晶体Nd:GdVO4的结构及生长;研究了其光谱特性,得出在808nm处具有较强的吸收峰,且三个主发射峰波长分别为912.6nm、1063.1nm、1341.3nm;讨论了其热导率,认为具有很高的热导率可能是因为掺入Nd^3+后晶格畸变并不大引起的;通过与Nd:YVO4和Nd:YAG进行性能比较,证明该晶体是LD泵浦高功率激光器的理想工作物质. 相似文献
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Guozhi Xie Ping Wang Baoshan Zhang Liukui Yuan Yi Shi Pinghua Lin Huaixian Lu 《Journal of magnetism and magnetic materials》2008
The electromagnetic wave-absorption properties of Nd3Fe68−xMnxCo18B11 (x=0, 1, 2) alloys obtained by rapid quenching from the melt was studied. The complex permittivity-frequency and permeability-frequency properties were determined in the microwave frequency regime of 2–18 GHz by vector network analysis. XRD spectra showed that only α-Fe diffraction peak was observed in the as-spun alloys. It is found that the acquired complex permittivity and permeability values match the microwave frequency when the 1 at% Mn content was doped. A minimum reflection loss of −6.9 dB is obtained at 2.7 GHz for composite Nd3Fe66Mn2Co18B11 with absorber thickness of 1.5 mm. The exchange interaction was attributed to the microwave absorption properties. The results suggest a new design of microwave absorbers based on electromagnetic wave-absorbing materials. 相似文献
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实验研究了Nd∶YVO4/Nd∶GdVO4双波长激光器在不同抽运功率条件下,通过调节热沉温度达到功率均衡时的输出特性.实验结果表明:对于Nd∶YVO4/Nd∶GdVO4双波长激光器,当提高抽运功率,需要重新降低热沉温度达到功率均衡输出,降温幅度与抽运功率增加之比为11.23℃/W.与此同时,随着抽运功率和热沉温度的变化,双波长激光器的中心波长会出现小幅度的漂移,左峰波长随抽运功率增加的蓝移速率为0.056 nm/W,右峰波长随抽运功率增加的蓝移速率为0.054 nm/W.实验还发现功率均衡条件下激光器的输出总功率随抽运功率的增加而增加,拟合斜效率为8.7%,当抽运功率为5.58 W时,输出最大总功率达到115.7 mW. 相似文献