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本文研究了缀饰原子系统中的双光子共振非简并四波混频.理论上我们研究了多普勒增宽的四能级系统中耦合光场对双光子共振非简并四波混频的影响,发现加入强耦合场后,非简并四波混频频谱出现Autler-Townes分裂;在不同双光子共振失谐时,由于量子干涉双光子共振非简并四波混频的信号能够被抑制或增强.实验上我们在Ba原子蒸汽中,通过引入基态6s2和自电离里德堡态6pnd之间的原子相干证实了该现象.本方法提供了一种不仅可以测得共振频率和横向弛豫,而且可以测得两个高激发原子态之间的跃迁的偶极矩阵元的新的光谱学工具. 相似文献
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Two-photon resonant nondegenerate four-wave mixing (NFWM) with the
addition of a coupling field in Ba atomic vapour has been studied. We
find that coherence of the atomic level transitions leads to
suppression of the NFWM signal, giving rise to a dip with a linewidth
that is linearly proportional to the intensity of the coupling field. 相似文献
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证明了使用时延方法可再现淹没在热背底中的喇曼信号,并且喇曼增强非简并四波混频光谱恢复为通常煌带有源于分子取向栅非共振背底的非对称线型,实验结果与理论予示一致。 相似文献
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本文将我们建立的非相干光时延四波混频(TDFWM-IL)的多能级理论由均匀加宽情形发展到非均匀加宽情形,得到吸收带同时存在均匀和非均匀加宽时,TDFWM-IL多能级理论给出的信号强度随两束泵光相对延时的一般关系式,讨论非均匀加宽占绝对优势时,非相干光光子回波的多能级理论结果,及其与二能级理论结果的差异,论证等效二能级模型同样适用于近似分析存在非均匀加宽影响时,吸收带TDFWM-IL的实验结果,报道在红宝石零声子线和甲酚紫固体膜吸收边上的实验结果,并与上述理论做了比较。 相似文献
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The fully oxidized state of polyaniline (PANI), pernigraniline (PN), was synthesizedby oxidation of the emeraldine base form of PANI dissolved in NMP solvent with m-chloroperoxybenzoic acid. The resulted PN was characterized by FTIR and UV-Visiblespectra. The third-order nonlinear optical properties of PN in concentrated sulfuric acid(PN/H_2SO_4) were measured by a degenerated four wave mixing (DFWM) method. The re-sults obtained suggest that the soliton-pair intermediate state associated with thedegenerated state does not play a major role in the third order nonlinear optical prop-erties of PANI. 相似文献