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阿秒科学是驱动超强超快激光往高平均功率和短脉冲宽度方向快速发展的动力之一.本文针对高重复频率阿秒光源的实际需求,开展了基于国产Yb:CaYAlO4晶体的再生放大理论和实验研究.在理论研究中,根据Yb:CaYAlO4晶体的热透镜计算结果,设计了热稳定性良好的模式可调再生腔;并对晶体π和σ偏振的放大输出能量和光谱进行计算.在此基础上,开展了Yb:CaYAlO4晶体不同偏振性质的再生放大实验研究.在晶体π偏振的实验中,获得了平均功率16.1 W、单脉冲能量1.61 mJ、光谱中心波长1030 nm、光谱半高全宽16 nm的放大输出,压缩后的激光脉冲宽度为149 fs,压缩效率为92.1%,峰值功率大于9.5 GW.在σ偏振获得了平均功率28.7 W、单脉冲能量2.87 mJ、光谱中心波长1037 nm、光谱半高全宽11 nm的放大输出,压缩后的激光脉冲宽度为178 fs,压缩效率为91.5%,峰值功率大于14.2 GW,光束质量因子M2 <1.2.以上研究结果实现了目前Yb:CaYAlO4... 相似文献
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采用非临界相位匹配切割,尺寸5mm×5mm×20mm的KTA作为非线性光学晶体,进行了基于半导体激光端面抽运Nd:YLF/KTA的内腔式连续光学参量振荡激光研究,获得了中红外3.5μm波段的连续激光输出。为了提高连续光参量振荡腔内信号光的功率密度,降低激光输出阈值,采用对信号光高反射的单谐振腔结构进行激光实验。在8.35W的抽运功率下,分别获得了335mW和110mW的3440nm和1505nm的激光输出,对应的总转换效率达到了5.6%。该实验研究表明半导体激光端面抽运的内腔式KTA连续光学参量振荡也能获得高效的中红外激光输出。 相似文献
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对电子束蒸发方式镀制的HfO2/SiO2反射膜采用大口径激光进行辐照,采用激光量热计测量了激光辐射前后的弱吸收值。实验发现HfO2/SiO2反射膜在分别采用1 064 nm和532 nm的激光辐照前后薄膜吸收分别从5.4%和1.7%降低到1.4和1.2%。采用聚焦离子束技术分析了激光辐照后薄膜的损伤形态并探究了损伤原因,发现:薄膜在激光辐照下存在节瘤的地方容易出现薄膜损伤,具体表现为熔融、部分喷发、完全脱落3种形态,节瘤缺陷种子来源的差异是导致其损伤机理也存在着巨大差异的主要原因。同时这些节瘤缺陷种子来源也影响着激光预处理作用效果,激光预处理技术对于祛除位于基底上种子形成的节瘤是有效的,原因是激光辐射过后该节瘤进行了预喷发而不会对后续激光产生影响;而激光预处理技术对位于膜层中间的可能是镀膜过程中材料飞溅引起的缺陷是无效的,需要通过飞秒激光手段对该类节瘤进行祛除。 相似文献
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报道了LD端面抽运c切Nd:YVO4自拉曼倍频黄光激光器的研究. 采用10 mm长,二类临界相位匹配角 (θ=69°,ø=0°)切割的KTP晶体作为倍频晶体. 考虑到c切Nd:YVO4跃迁截面较小,所以通过对谐振腔及晶体膜系的严格设计,减少腔内插入损耗和衍射损耗. 最终在脉冲重复率为10 kHz,抽运功率为11.2 W下,获得了最高570 mW的倍频黄光激光输出,对应抽运光到倍频黄光的转化效率约为
关键词:
拉曼激光
c切Nd:YVO4')" href="#">c切Nd:YVO4
589 nm
黄光激光 相似文献
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对一种低温易烧结的Yb:Y2-2xLa2xO3激光透明陶瓷的光谱性能进行了初步研究,Yb:Y2-2xLa2xO3激光透明陶瓷具有宽的吸收带和大的吸收截面,在最强的吸收峰977nm处吸收截面达4.0×10-20cm2;其荧光发射寿命为1.1ms,发射截面在1033nm处为1.0×10-20cm2,在1077nm处为0.7×10-20cm2.Yb:Y2-2xLa2xO3陶瓷的各项光学性能指标接近或达到单晶的指标.
关键词:
氧化镧钇
激光陶瓷
低温烧结
光谱性能 相似文献
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Mina NeghabiAbbas Behjat 《Current Applied Physics》2012,12(2):597-601
Organic light emitting diodes (OLEDs) of ITO/PEDOT:PSS/TPD:Alq3:C60/Al with different C60 concentrations (0-6.0 wt.%) have been fabricated. The physical parameters including electrical and optical properties of the samples have been measured by Luminance-current-voltage (L-I-V) characteristics and optical absorbance. The current-voltage characteristics indicate that field-emission tunneling injection dominates in the diodes at high applied voltages. It is found that with increasing the concentration of C60, the injection barrier for holes slightly reduces and the hole’s mobility increases over two orders of magnitude. Also, electroluminescence enhances with the presence of C60 in the blend; optimum current efficiency occurs at 3 wt% C60. The method provides a simple way of increasing the efficiency of OLEDs. 相似文献
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The title compounds (Sr0.96−xBa0.04)Al12−yMgyO19:Tbx (0<x<0.4; 0<y<0.18) are single-phase magnetoplumbite determined by X-ray powder diffraction analysis. The characteristic emission lines of 5D3→7Fj (j=2, 3, 4, 5) and 5D4→7Fj (j=4, 5, 6) of Tb3+ are recorded under the VUV excitation. The intensive luminescence mainly comes from 5D3→7Fj transition when the concentration of Tb3+ is low. However, when the concentration of Tb3+ starts to increase from very low concentration, 5D4→7Fj transition is becoming dominant. Three broad excitation bands at 165, 193 and 233 nm have been observed. The band at 165 nm originates from the overlap between the host absorption and the charge transfer of Tb3+-O2−. The other two broad bands are the first spin-allowed and the spin-forbidden of 4f-5d transition, respectively. The experimental observation of the 4f-5d transition of Tb3+ is consistent well with the theoretical expectations. 相似文献
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Single phase of Ca1−xMo1−ySiyO4:Eux3+ (0.18?x?0.26, 0?y?0.04) was synthesized by solid-state method. The photoluminescence investigation indicated that Ca1−xMoO4:Eux3+ (0.18?x?0.26) could be effectively excited by 393 and 464 nm, and it exhibited an intense red emission at 615 nm. The introduction of Si4+ ions did not change the position of the peaks but strongly enhanced the emission intensity of Eu3+ under 393 and 464 nm excitations and showed very good color purity. The emission intensity of optimal Ca0.8Mo0.98Si0.02O4:Eu0.23+ sample (excited by 393 nm) was about 5.5 times higher than that of the phosphor Y2O2S:0.05Eu3+. So this phosphor could be nicely suitable for the application of the UV LED chips. 相似文献
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Recently Nemanich et al. proposed some refinements to the study of vibrational properties of GexSe1?x glasses we had previously reported. We present a number of arguments which lead to the conclusion that those refinements do not rest on sufficiently sustained proofs. 相似文献
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Pure Li6CaB3O8.5 and Li6Ca1−xPbxB3O8.5 (0.005≤x≤0.04) materials were prepared by a solution combustion synthesis method. The phase of synthesized materials was determined using the powder XRD and FTIR. The synthesized materials were investigated using spectrofluorometer at room temperature. The emission and excitation bands of the synthesized phosphors were observed at 307 and 268 nm, respectively. The dependence of the emission intensity on the Pb2+ concentration for the Li6Ca1−xPbxB3O8.5 (0.005≤x≤0.04) was studied and observed that the optimum concentration of Pb2+ in phosphor is 0.01 mol. The Stokes shift of the synthesized phosphor was calculated to be 4740 cm-1. 相似文献