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由与Na_2-Na双光子混合共振相关联的四波混频过程产生可调谐紫外相干辐射。当以614.5~617.4nm的染料激光泵浦钠蒸气时,第一个光子将钠分子从基态X_1∑_g~+激发到A~1∑_u~+态;通过Na_2~*-Na近共振碰撞能量转移过程,将处于基态3S的钾原子激发到3P(3/2),(3/2)态;第二个光子将钠原子共振激发到5S态,从而产生5S→4P的受激辐射和4P→4S的串级受激辐射。而在离共振激发时,除上述受激辐射(或串级受激辐射)外,还存在分别起始于3P_(1/2)和3P(3/2)态的受激喇曼散射。上述受激辐射(或串级受激辐射)和受激喇曼散射分别与泵浦光的 相似文献
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本文报道了在K2-K混合系统中由单光子共振激发原子于4P能级,通过4P原子的能量积聚效应及原子──分子的碰撞能量转移过程使分子在高位三重态获得布居,从而产生的扩散带受激辐射.至今已经发现了多种产生分子扩散带的机制.在钠分于中,由单光子或双光子激发销原子于3P能级或4D(或4F)能级,以及在宽波段范围内由可调谐激光双光子激发钠分子获得了紫区430.0nm附近的扩散带受激辐射以及360.0nm附近的扩散带受激辐射;对于锂分子,以双光子共振激发锂原子4S能级,产生蓝区扩散带受激辐射,以紫外单光子激发锂分子态或光-光双共振激发… 相似文献
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由高能电子束激发成功地观测到来自内壳层电离态Cs2+F-(与XeF具有等电子序的结构)的两个离子准分子发射带。其中心在185nm的强发射带被标记为来自Cs2+F-离子准分子的B-X带束缚一自由跃迁.152nm附近的发射带是来自于Cs2+F-的D—X带连续辐射。 相似文献
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用图像增强CCD摄像机测量了单向表面放电型AC PDP单元中Xe^*(3P1)共振发射的147nm VUV以及He-Xe放电产生的连续光谱的时间变化。共振辐射的详细测量呈现出强压力增宽,快速升到它的峰值以及具有多时间常数衰减的现象。衰减时间常数,共振相对强度和二聚物辐射是随总气压以及Xe含量的变化而变化的,这就意味着:碰撞激发, 激 相似文献
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本文报道了由Na_2-Na系统中不等频两步混合共振四波混频这一特殊过程产生紫外宽范围(319.2nm—354.2nm)可调谐相干辐射的新结果。 在实验过程中,用一YAG激光泵浦的脉冲染料激光激发钠分子,在激发波长550—670nm范围内,钠分子总能共振吸收入射光(设频率为ω_1)而跃迁到A~1∑_u~+态或B~1∏_u态,通过受激发分子与基态原子的碰转能量转移过程,分子的激发态能量可转移给原子而使钠原子3P_(1/2,3/2)态获得布居。将由同一YAG激光泵浦的染料激光调谐到3P_(1/2)→4D共 相似文献
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报导了CO掺杂HCl+Xe矩阵晶体中,在308nm激光的激发下,首次观测到Xe2^+Cl^-的辐射荧光谱,表明发生了合作电荷转移吸收反应。在四体双光子吸收反应。 相似文献
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The UV excimer lasers ArF, KrCl, KrF, and XeCl were utilized to create new families of UV lines by multiple orders of broad-band nonresonant stimulated Raman scattering (SRS) in the media H2 , D2 , CH4 , and LN2 . Mixed-media and excited-state SRS were also studied. 相似文献
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甲烷和氢气混合气体中的多波长拉曼转换 总被引:4,自引:1,他引:3
探索Nd:YAG倍频激光与受激拉曼散射(SRS)结合获得从紫外到可见光范围的多波长输出,可应用于激光雷达探测空气污染等领域。利用Nd:YAG激光的三倍频355nm波长输出在甲烷及甲烷和氢气混合气体中的拉曼特性进行研究。获得在396nm,416nm,447nm和503nm 515nm等多个波长分别约100mW的同时输出,以及对个别波长的增强。讨论了不同常见的工作气体及混合气体的特点。与单一工作气体(氢气或甲烷)相比,混合气体可以获得更为丰富的波长输出。相比甲烷气体在紫外激光照射下的分解作用,由于氢气的加入一定程度上抑制了分解反应,混合气体产生的分解沉淀较少。 相似文献
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Three new UV laser lines, S III 363.2 nm and O II 397.3 and 398.3 nm, obtained by means of an axial pulse discharge, are reported. 相似文献
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研究了放电管尺寸为φ28×980 mm的金蒸气激光器627.8 nm和312.2 nm波长的受激发射.应用新型谐振腔,可以同时获得红光和紫外两个波长的激光,当红光的激光输出为2.3 W时,紫外312.2 nm平均输出功率为300 mW,输出光束直径为28 mm,两个波长激光的发散度为3 mrad. 相似文献
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脉冲激光沉积法制备氧化锌薄膜 总被引:7,自引:0,他引:7
ZnO是一种新型的Ⅱ-Ⅵ族半导体材料,具有优良的晶格、光学和电学性能,其显著的特点是在紫外波段存在受激发射。利用脉冲激光沉积法(PLD)在氧气氛中烧蚀锌靶制备了纳米晶氧化锌薄膜,衬底为石英玻璃,晶粒尺寸约为28-35 nm。X射线衍射(XRD)结果和光致发光(PL)光谱的测量表明,当衬底温度在100-250℃范围内时,所获得的ZnO薄膜具有c轴的择优取向,所有样品的强紫外发射中心均在378-385 nm范围内,深能级发射中心约518-558 nm,衬底温度为200℃时,得到了单一的紫外光发射(没有深能级发光)。这归因于其较高的结晶质量。 相似文献
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Whispering gallery mode (WGM)-enhanced nonlinear optical phenomena from crown-like nanostructure zinc oxide (ZnO) samples are observed. The samples are synthesized by vapor-phase transport method. The morphology and crystal struc- ture are examined and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM), and they are excited by femtosecond laser pulses with cen- tral wavelengths of 355 nm, 800 nm and 1150 nm, respectively. The typical stimulated emission presents a red shift com- pared with spontaneous emission, which is observed under the excitation of 355 nm with a relatively low threshold. The ultraviolet (UV) frequency up-conversion emission is obtained when the excitation pulse wavelengths are selected as 800 nm and 1150 nm, respectively. The peak position and the relationship between the emission intensity and excitation inten- sity demonstrate that the UV up-conversion photoluminescence (PL) is induced by two- and three-photon absorptions. The PL characteristics and their WGM-enhanced mechanism are investigated. 相似文献
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In this experimental work, the SBS and SRS processes were used in order to produce UV laser beams of good optical quality and short time duration. An XeCl oscillator and a double-pass amplifier with a phase-conjugate mirror via stimulated Brillouin scattering, generate the laser beam at 308 nm to pump a Raman cell. The oscillator pulse was 11 ns long, while the amplified phase-conjugate beam duration could vary from 3.3 to 1.5 ns, due to the compression operated by the Brillouin mirror. When this last laser beam was focused into a Raman cell containing methane at 30 atm, the shortest backward stimulated Raman scattering pulse at 338.4 nm was 170 ps long with 0.4 ml of energy. The 338.4-nm wavelength is interesting for the production of short bunches of cold electrons from Mg and Zn targets 相似文献
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SrZn2(PO4)2:Sm3+ phosphor was synthesized by a high temperature solid-state reaction in atmosphere. SrZn2(PO4)2:Sm3+ phosphor is efficiently excited by ultraviolet (UV) and blue light, and the emission peaks are assigned to the transitions of 4G5/2-6H5/2 (563 nm), 4G5/2-6H7/2 (597 nm and 605 nm) and 4G5/2-6H9/2 (644 nm and 653 nm). The emission intensities of SrZn2(PO4)2:Sm3+ are influenced by Sm3+ concentration, and the concentration quenching effect of SrZn2(PO4)2:Sm3+ is also observed. When doping A+ (A=Li, Na and K) ions, the emission intensity of SrZn2(PO4)2:Sm3+ can be obviously enhanced. The Commission Internationale de l'Eclairage (CIE) color coordinates of SrZn2(PO4)2:Sm3+ locate in the orange-red region. The results indicate that the phosphor has a potential application in white light emitting diodes (LEDs). 相似文献